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\define{versionidusing} \versionid $Id: using.but 9149 2011-04-08 15:52:02Z jacob $\r
\r
\C{using} Using PuTTY\r
\r
This chapter provides a general introduction to some more advanced\r
features of PuTTY. For extreme detail and reference purposes,\r
\k{config} is likely to contain more information.\r
\r
\H{using-session} During your session\r
\r
A lot of PuTTY's complexity and features are in the configuration\r
panel. Once you have worked your way through that and started\r
a session, things should be reasonably simple after that.\r
Nevertheless, there are a few more useful features available.\r
\r
\S{using-selection} Copying and pasting text\r
\r
\I{copy and paste}Often in a PuTTY session you will find text on\r
your terminal screen which you want to type in again. Like most\r
other terminal emulators, PuTTY allows you to copy and paste the\r
text rather than having to type it again. Also, copy and paste uses\r
the \I{Windows clipboard}Windows \i{clipboard}, so that you can\r
paste (for example) URLs into a web browser, or paste from a word\r
processor or spreadsheet into your terminal session.\r
\r
PuTTY's copy and paste works entirely with the \i{mouse}. In order\r
to copy text to the clipboard, you just click the \i{left mouse\r
button} in the \i{terminal window}, and drag to \I{selecting text}select\r
text. When you let go of the button, the text is \e{automatically}\r
copied to the clipboard. You do not need to press Ctrl-C or\r
Ctrl-Ins; in fact, if you do press Ctrl-C, PuTTY will send a Ctrl-C\r
character down your session to the server where it will probably\r
cause a process to be interrupted.\r
\r
Pasting is done using the right button (or the middle mouse button,\r
if you have a \i{three-button mouse} and have set it up; see\r
\k{config-mouse}). (Pressing \i{Shift-Ins}, or selecting \q{Paste}\r
from the \I{right mouse button, with Ctrl}Ctrl+right-click\r
\i{context menu}, have the same effect.) When\r
you click the \i{right mouse button}, PuTTY will read whatever is in\r
the Windows clipboard and paste it into your session, \e{exactly} as\r
if it had been typed at the keyboard. (Therefore, be careful of\r
pasting formatted text into an editor that does automatic indenting;\r
you may find that the spaces pasted from the clipboard plus the\r
spaces added by the editor add up to too many spaces and ruin the\r
formatting. There is nothing PuTTY can do about this.)\r
\r
If you \i{double-click} the left mouse button, PuTTY will\r
\I{selecting words}select a whole word. If you double-click, hold\r
down the second click, and drag the mouse, PuTTY will select a\r
sequence of whole words. (You can adjust precisely what PuTTY\r
considers to be part of a word; see \k{config-charclasses}.)\r
If you \e{triple}-click, or \i{triple-click} and drag, then\r
PuTTY will \I{selecting lines}select a whole line or sequence of lines.\r
\r
If you want to select a \I{rectangular selection}rectangular region\r
instead of selecting to the end of each line, you can do this by\r
holding down Alt when you make your selection. You can also\r
configure rectangular selection to be the default, and then holding\r
down Alt gives the normal behaviour instead: see\r
\k{config-rectselect} for details.\r
\r
(In some Unix environments, Alt+drag is intercepted by the window\r
manager. Shift+Alt+drag should work for rectangular selection as\r
well, so you could try that instead.)\r
\r
If you have a \i{middle mouse button}, then you can use it to\r
\I{adjusting a selection}adjust an existing selection if you\r
selected something slightly wrong. (If you have configured the\r
middle mouse button to paste, then the right mouse button does this\r
instead.) Click the button on the screen, and you can pick up the\r
nearest end of the selection and drag it to somewhere else.\r
\r
It's possible for the server to ask to \I{mouse reporting}handle mouse\r
clicks in the PuTTY window itself.  If this happens, the \i{mouse pointer}\r
will turn into an arrow, and using the mouse to copy and paste will only\r
work if you hold down Shift.  See \k{config-features-mouse} and\r
\k{config-mouseshift} for details of this feature and how to configure\r
it.\r
\r
\S{using-scrollback} \I{scrollback}Scrolling the screen back\r
\r
PuTTY keeps track of text that has scrolled up off the top of the\r
terminal. So if something appears on the screen that you want to\r
read, but it scrolls too fast and it's gone by the time you try to\r
look for it, you can use the \i{scrollbar} on the right side of the\r
window to look back up the session \i{history} and find it again.\r
\r
As well as using the scrollbar, you can also page the scrollback up\r
and down by pressing \i{Shift-PgUp} and \i{Shift-PgDn}. You can\r
scroll a line at a time using \i{Ctrl-PgUp} and \i{Ctrl-PgDn}. These\r
are still available if you configure the scrollbar to be invisible.\r
\r
By default the last 200 lines scrolled off the top are\r
preserved for you to look at. You can increase (or decrease) this\r
value using the configuration box; see \k{config-scrollback}.\r
\r
\S{using-sysmenu} The \ii{System menu}\r
\r
If you click the left mouse button on the icon in the top left\r
corner of PuTTY's terminal window, or click the right mouse button\r
on the title bar, you will see the standard Windows system menu\r
containing items like Minimise, Move, Size and Close.\r
\r
PuTTY's system menu contains extra program features in addition to\r
the Windows standard options. These extra menu commands are\r
described below.\r
\r
(These options are also available in a \i{context menu} brought up\r
by holding Ctrl and clicking with the right mouse button anywhere\r
in the \i{PuTTY window}.)\r
\r
\S2{using-eventlog} The PuTTY \i{Event Log}\r
\r
If you choose \q{Event Log} from the system menu, a small window\r
will pop up in which PuTTY logs significant events during the\r
connection. Most of the events in the log will probably take place\r
during session startup, but a few can occur at any point in the\r
session, and one or two occur right at the end.\r
\r
You can use the mouse to select one or more lines of the Event Log,\r
and hit the Copy button to copy them to the \i{clipboard}. If you\r
are reporting a bug, it's often useful to paste the contents of the\r
Event Log into your bug report.\r
\r
\S2{using-specials} \ii{Special commands}\r
\r
Depending on the protocol used for the current session, there may be\r
a submenu of \q{special commands}. These are protocol-specific\r
tokens, such as a \q{break} signal, that can be sent down a\r
connection in addition to normal data. Their precise effect is usually\r
up to the server. Currently only Telnet, SSH, and serial connections\r
have special commands.\r
\r
The \q{break} signal can also be invoked from the keyboard with\r
\i{Ctrl-Break}.\r
\r
The following \I{Telnet special commands}special commands are\r
available in Telnet:\r
\r
\b \I{Are You There, Telnet special command}Are You There\r
\r
\b \I{Break, Telnet special command}Break\r
\r
\b \I{Synch, Telnet special command}Synch\r
\r
\b \I{Erase Character, Telnet special command}Erase Character\r
\r
\lcont{\r
PuTTY can also be configured to send this when the Backspace key is\r
pressed; see \k{config-telnetkey}.\r
}\r
\r
\b \I{Erase Line, Telnet special command}Erase Line\r
\r
\b \I{Go Ahead, Telnet special command}Go Ahead\r
\r
\b \I{No Operation, Telnet special command}No Operation\r
\r
\lcont{\r
Should have no effect.\r
}\r
\r
\b \I{Abort Process, Telnet special command}Abort Process\r
\r
\b \I{Abort Output, Telnet special command}Abort Output\r
\r
\b \I{Interrupt Process, Telnet special command}Interrupt Process\r
\r
\lcont{\r
PuTTY can also be configured to send this when Ctrl-C is typed; see\r
\k{config-telnetkey}.\r
}\r
\r
\b \I{Suspend Process, Telnet special command}Suspend Process\r
\r
\lcont{\r
PuTTY can also be configured to send this when Ctrl-Z is typed; see\r
\k{config-telnetkey}.\r
}\r
\r
\b \I{End Of Record, Telnet special command}End Of Record\r
\r
\b \I{End Of File, Telnet special command}End Of File\r
\r
In an SSH connection, the following \I{SSH special commands}special\r
commands are available:\r
\r
\b \I{IGNORE message, SSH special command}\I{No-op, in SSH}\ii{IGNORE message}\r
\r
\lcont{\r
Should have no effect.\r
}\r
\r
\b \I{Repeat key exchange, SSH special command}Repeat key exchange\r
\r
\lcont{\r
Only available in SSH-2. Forces a \i{repeat key exchange} immediately (and\r
resets associated timers and counters). For more information about\r
repeat key exchanges, see \k{config-ssh-kex-rekey}.\r
}\r
\r
\b \I{Break, SSH special command}Break\r
\r
\lcont{\r
Only available in SSH-2, and only during a session. Optional\r
extension; may not be supported by server. PuTTY requests the server's\r
default break length.\r
}\r
\r
\b \I{Signal, SSH special command}Signals (SIGINT, SIGTERM etc)\r
\r
\lcont{\r
Only available in SSH-2, and only during a session. Sends various\r
POSIX signals. Not honoured by all servers.\r
}\r
\r
With a serial connection, the only available special command is\r
\I{Break, serial special command}\q{Break}.\r
\r
\S2{using-newsession} Starting new sessions\r
\r
PuTTY's system menu provides some shortcut ways to start new\r
sessions:\r
\r
\b Selecting \i{\q{New Session}} will start a completely new\r
instance of PuTTY, and bring up the configuration box as normal.\r
\r
\b Selecting \i{\q{Duplicate Session}} will start a session in a\r
new window with precisely the same options as your current one -\r
connecting to the same host using the same protocol, with all the\r
same terminal settings and everything.\r
\r
\b In an inactive window, selecting \i{\q{Restart Session}} will\r
do the same as \q{Duplicate Session}, but in the current window.\r
\r
\b The \i{\q{Saved Sessions} submenu} gives you quick access to any\r
sets of stored session details you have previously saved. See\r
\k{config-saving} for details of how to create saved sessions.\r
\r
\S2{using-changesettings} \I{settings, changing}Changing your\r
session settings\r
\r
If you select \i{\q{Change Settings}} from the system menu, PuTTY will\r
display a cut-down version of its initial configuration box. This\r
allows you to adjust most properties of your current session. You\r
can change the terminal size, the font, the actions of various\r
keypresses, the colours, and so on.\r
\r
Some of the options that are available in the main configuration box\r
are not shown in the cut-down Change Settings box. These are usually\r
options which don't make sense to change in the middle of a session\r
(for example, you can't switch from SSH to Telnet in mid-session).\r
\r
You can save the current settings to a saved session for future use\r
from this dialog box. See \k{config-saving} for more on saved\r
sessions.\r
\r
\S2{using-copyall} \i{Copy All to Clipboard}\r
\r
This system menu option provides a convenient way to copy the whole\r
contents of the terminal screen (up to the last nonempty line) and\r
scrollback to the \i{clipboard} in one go.\r
\r
\S2{reset-terminal} \I{scrollback, clearing}Clearing and\r
\I{terminal, resetting}resetting the terminal\r
\r
The \i{\q{Clear Scrollback}} option on the system menu tells PuTTY\r
to discard all the lines of text that have been kept after they\r
scrolled off the top of the screen. This might be useful, for\r
example, if you displayed sensitive information and wanted to make\r
sure nobody could look over your shoulder and see it. (Note that\r
this only prevents a casual user from using the scrollbar to view\r
the information; the text is not guaranteed not to still be in\r
PuTTY's memory.)\r
\r
The \i{\q{Reset Terminal}} option causes a full reset of the\r
\i{terminal emulation}. A VT-series terminal is a complex piece of\r
software and can easily get into a state where all the text printed\r
becomes unreadable. (This can happen, for example, if you\r
accidentally output a binary file to your terminal.) If this\r
happens, selecting Reset Terminal should sort it out.\r
\r
\S2{using-fullscreen} \ii{Full screen} mode\r
\r
If you find the title bar on a maximised window to be ugly or\r
distracting, you can select Full Screen mode to maximise PuTTY\r
\q{even more}. When you select this, PuTTY will expand to fill the\r
whole screen and its borders, title bar and scrollbar will\r
disappear. (You can configure the scrollbar not to disappear in\r
full-screen mode if you want to keep it; see \k{config-scrollback}.)\r
\r
When you are in full-screen mode, you can still access the \i{system\r
menu} if you click the left mouse button in the \e{extreme} top left\r
corner of the screen.\r
\r
\H{using-logging} Creating a \i{log file} of your \I{session\r
log}session\r
\r
For some purposes you may find you want to log everything that\r
appears on your screen. You can do this using the \q{Logging}\r
panel in the configuration box.\r
\r
To begin a session log, select \q{Change Settings} from the system\r
menu and go to the Logging panel. Enter a log file name, and select\r
a logging mode. (You can log all session output including the\r
terminal \i{control sequence}s, or you can just log the printable text.\r
It depends what you want the log for.) Click \q{Apply} and your log\r
will be started. Later on, you can go back to the Logging panel and\r
select \q{Logging turned off completely} to stop logging; then PuTTY\r
will close the log file and you can safely read it.\r
\r
See \k{config-logging} for more details and options.\r
\r
\H{using-translation} Altering your \i{character set} configuration\r
\r
If you find that special characters (\i{accented characters}, for\r
example, or \i{line-drawing characters}) are not being displayed\r
correctly in your PuTTY session, it may be that PuTTY is interpreting\r
the characters sent by the server according to the wrong \e{character\r
set}. There are a lot of different character sets available, so it's\r
entirely possible for this to happen.\r
\r
If you click \q{Change Settings} and look at the \q{Translation}\r
panel, you should see a large number of character sets which you can\r
select, and other related options. Now all you need is to find out\r
which of them you want! (See \k{config-translation} for more\r
information.)\r
\r
\H{using-x-forwarding} Using \i{X11 forwarding} in SSH\r
\r
The SSH protocol has the ability to securely forward X Window System\r
applications over your encrypted SSH connection, so that you can run\r
an application on the SSH server machine and have it put its windows\r
up on your local machine without sending any X network traffic in\r
the clear.\r
\r
In order to use this feature, you will need an X display server for\r
your Windows machine, such as Cygwin/X, X-Win32, or Exceed. This will probably\r
install itself as display number 0 on your local machine; if it\r
doesn't, the manual for the \i{X server} should tell you what it\r
does do.\r
\r
You should then tick the \q{Enable X11 forwarding} box in the\r
X11 panel (see \k{config-ssh-x11}) before starting your SSH\r
session. The \i{\q{X display location}} box is blank by default, which\r
means that PuTTY will try to use a sensible default such as \c{:0},\r
which is the usual display location where your X server will be\r
installed. If that needs changing, then change it.\r
\r
Now you should be able to log in to the SSH server as normal. To\r
check that X forwarding has been successfully negotiated during\r
connection startup, you can check the PuTTY Event Log (see\r
\k{using-eventlog}). It should say something like this:\r
\r
\c 2001-12-05 17:22:01 Requesting X11 forwarding\r
\c 2001-12-05 17:22:02 X11 forwarding enabled\r
\r
If the remote system is Unix or Unix-like, you should also be able\r
to see that the \i{\c{DISPLAY} environment variable} has been set to\r
point at display 10 or above on the SSH server machine itself:\r
\r
\c fred@unixbox:~$ echo $DISPLAY\r
\c unixbox:10.0\r
\r
If this works, you should then be able to run X applications in the\r
remote session and have them display their windows on your PC.\r
\r
For more options relating to X11 forwarding, see \k{config-ssh-x11}.\r
\r
\H{using-port-forwarding} Using \i{port forwarding} in SSH\r
\r
The SSH protocol has the ability to forward arbitrary \i{network\r
connection}s over your encrypted SSH connection, to avoid the network\r
traffic being sent in clear. For example, you could use this to\r
connect from your home computer to a \i{POP-3} server on a remote\r
machine without your POP-3 password being visible to network\r
sniffers.\r
\r
In order to use port forwarding to \I{local port forwarding}connect\r
from your local machine to a port on a remote server, you need to:\r
\r
\b Choose a \i{port number} on your local machine where PuTTY should\r
listen for incoming connections. There are likely to be plenty of\r
unused port numbers above 3000. (You can also use a local loopback\r
address here; see below for more details.)\r
\r
\b Now, before you start your SSH connection, go to the Tunnels\r
panel (see \k{config-ssh-portfwd}). Make sure the \q{Local} radio\r
button is set. Enter the local port number into the \q{Source port}\r
box. Enter the destination host name and port number into the\r
\q{Destination} box, separated by a colon (for example,\r
\c{popserver.example.com:110} to connect to a POP-3 server).\r
\r
\b Now click the \q{Add} button. The details of your port forwarding\r
should appear in the list box.\r
\r
Now start your session and log in. (Port forwarding will not be\r
enabled until after you have logged in; otherwise it would be easy\r
to perform completely anonymous network attacks, and gain access to\r
anyone's virtual private network.) To check that PuTTY has set up\r
the port forwarding correctly, you can look at the PuTTY Event Log\r
(see \k{using-eventlog}). It should say something like this:\r
\r
\c 2001-12-05 17:22:10 Local port 3110 forwarding to\r
\c          popserver.example.com:110\r
\r
Now if you connect to the source port number on your local PC, you\r
should find that it answers you exactly as if it were the service\r
running on the destination machine. So in this example, you could\r
then configure an e-mail client to use \c{localhost:3110} as a POP-3\r
server instead of \c{popserver.example.com:110}. (Of course, the\r
forwarding will stop happening when your PuTTY session closes down.)\r
\r
You can also forward ports in the other direction: arrange for a\r
particular port number on the \e{server} machine to be \I{remote\r
port forwarding}forwarded back to your PC as a connection to a\r
service on your PC or near it.\r
To do this, just select the \q{Remote} radio button instead of the\r
\q{Local} one. The \q{Source port} box will now specify a port\r
number on the \e{server} (note that most servers will not allow you\r
to use \I{privileged port}port numbers under 1024 for this purpose).\r
\r
An alternative way to forward local connections to remote hosts is\r
to use \I{dynamic port forwarding}dynamic SOCKS proxying. In this\r
mode, PuTTY acts as a SOCKS server, which SOCKS-aware programs can\r
connect to and open forwarded connections to the destination of their\r
choice, so this can be an alternative to long lists of static\r
forwardings. To use this mode, you will need to select the \q{Dynamic}\r
radio button instead of \q{Local}, and then you should not enter\r
anything into the \q{Destination} box (it will be ignored). PuTTY will\r
then listen for SOCKS connections on the port you have specified.\r
Most \i{web browsers} can be configured to connect to this SOCKS proxy\r
service; also, you can forward other PuTTY connections through it by\r
setting up the Proxy control panel (see \k{config-proxy} for details).\r
\r
The source port for a forwarded connection usually does not accept\r
connections from any machine except the \I{localhost}SSH client or\r
server machine itself (for local and remote forwardings respectively).\r
There are controls in the Tunnels panel to change this:\r
\r
\b The \q{Local ports accept connections from other hosts} option\r
allows you to set up local-to-remote port forwardings (including\r
dynamic port forwardings) in such a way that machines other than\r
your client PC can connect to the forwarded port.\r
\r
\b The \q{Remote ports do the same} option does the same thing for\r
remote-to-local port forwardings (so that machines other than the\r
SSH server machine can connect to the forwarded port.) Note that\r
this feature is only available in the SSH-2 protocol, and not all\r
SSH-2 servers honour it (in \i{OpenSSH}, for example, it's usually\r
disabled by default).\r
\r
You can also specify an \i{IP address} to \I{listen address}listen\r
on. Typically a Windows machine can be asked to listen on any single\r
IP address in the \cw{127.*.*.*} range, and all of these are\r
\i{loopback address}es available only to the local machine. So if\r
you forward (for example) \c{127.0.0.5:79} to a remote machine's\r
\i\cw{finger} port, then you should be able to run commands such as\r
\c{finger fred@127.0.0.5}.\r
This can be useful if the program connecting to the forwarded port\r
doesn't allow you to change the port number it uses. This feature is\r
available for local-to-remote forwarded ports; SSH-1 is unable to\r
support it for remote-to-local ports, while SSH-2 can support it in\r
theory but servers will not necessarily cooperate.\r
\r
(Note that if you're using Windows XP Service Pack 2, you may need\r
to obtain a fix from Microsoft in order to use addresses like\r
\cw{127.0.0.5} - see \k{faq-alternate-localhost}.)\r
\r
For more options relating to port forwarding, see\r
\k{config-ssh-portfwd}.\r
\r
If the connection you are forwarding over SSH is itself a second SSH\r
connection made by another copy of PuTTY, you might find the\r
\q{logical host name} configuration option useful to warn PuTTY of\r
which host key it should be expecting. See \k{config-loghost} for\r
details of this.\r
\r
\H{using-rawprot} Making \i{raw TCP connections}\r
\r
A lot of \I{debugging Internet protocols}Internet protocols are\r
composed of commands and responses in plain text. For example,\r
\i{SMTP} (the protocol used to transfer e-mail), \i{NNTP} (the\r
protocol used to transfer Usenet news), and \i{HTTP} (the protocol\r
used to serve Web pages) all consist of commands in readable plain\r
text.\r
\r
Sometimes it can be useful to connect directly to one of these\r
services and speak the protocol \q{by hand}, by typing protocol\r
commands and watching the responses. On Unix machines, you can do\r
this using the system's \c{telnet} command to connect to the right\r
port number. For example, \c{telnet mailserver.example.com 25} might\r
enable you to talk directly to the SMTP service running on a mail\r
server.\r
\r
Although the Unix \c{telnet} program provides this functionality,\r
the protocol being used is not really Telnet. Really there is no\r
actual protocol at all; the bytes sent down the connection are\r
exactly the ones you type, and the bytes shown on the screen are\r
exactly the ones sent by the server. Unix \c{telnet} will attempt to\r
detect or guess whether the service it is talking to is a real\r
Telnet service or not; PuTTY prefers to be told for certain.\r
\r
In order to make a debugging connection to a service of this type,\r
you simply select the fourth protocol name, \I{\q{Raw}\r
protocol}\q{Raw}, from the \q{Protocol} buttons in the \q{Session}\r
configuration panel. (See \k{config-hostname}.) You can then enter a\r
host name and a port number, and make the connection.\r
\r
\H{using-serial} Connecting to a local serial line\r
\r
PuTTY can connect directly to a local serial line as an alternative\r
to making a network connection. In this mode, text typed into the\r
PuTTY window will be sent straight out of your computer's serial\r
port, and data received through that port will be displayed in the\r
PuTTY window. You might use this mode, for example, if your serial\r
port is connected to another computer which has a serial connection.\r
\r
To make a connection of this type, simply select \q{Serial} from the\r
\q{Connection type} radio buttons on the \q{Session} configuration\r
panel (see \k{config-hostname}). The \q{Host Name} and \q{Port}\r
boxes will transform into \q{Serial line} and \q{Speed}, allowing\r
you to specify which serial line to use (if your computer has more\r
than one) and what speed (baud rate) to use when transferring data.\r
For further configuration options (data bits, stop bits, parity,\r
flow control), you can use the \q{Serial} configuration panel (see\r
\k{config-serial}).\r
\r
After you start up PuTTY in serial mode, you might find that you\r
have to make the first move, by sending some data out of the serial\r
line in order to notify the device at the other end that someone is\r
there for it to talk to. This probably depends on the device. If you\r
start up a PuTTY serial session and nothing appears in the window,\r
try pressing Return a few times and see if that helps.\r
\r
A serial line provides no well defined means for one end of the\r
connection to notify the other that the connection is finished.\r
Therefore, PuTTY in serial mode will remain connected until you\r
close the window using the close button.\r
\r
\H{using-cmdline} The PuTTY command line\r
\r
PuTTY can be made to do various things without user intervention by\r
supplying \i{command-line arguments} (e.g., from a \i{command prompt\r
window}, or a \i{Windows shortcut}).\r
\r
\S{using-cmdline-session} Starting a session from the command line\r
\r
\I\c{-ssh}\I\c{-telnet}\I\c{-rlogin}\I\c{-raw}\I\c{-serial}These\r
options allow you to bypass the configuration window and launch\r
straight into a session.\r
\r
To start a connection to a server called \c{host}:\r
\r
\c putty.exe [-ssh | -telnet | -rlogin | -raw] [user@]host\r
\r
If this syntax is used, settings are taken from the \i{Default Settings}\r
(see \k{config-saving}); \c{user} overrides these settings if\r
supplied. Also, you can specify a protocol, which will override the\r
default protocol (see \k{using-cmdline-protocol}).\r
\r
For telnet sessions, the following alternative syntax is supported\r
(this makes PuTTY suitable for use as a URL handler for \i{telnet\r
URLs} in \i{web browsers}):\r
\r
\c putty.exe telnet://host[:port]/\r
\r
To start a connection to a serial port, e.g. COM1:\r
\r
\c putty.exe -serial com1\r
\r
In order to start an existing saved session called \c{sessionname},\r
use the \c{-load} option (described in \k{using-cmdline-load}).\r
\r
\c putty.exe -load "session name"\r
\r
\S{using-cleanup} \i\c{-cleanup}\r
\r
\cfg{winhelp-topic}{options.cleanup}\r
\r
If invoked with the \c{-cleanup} option, rather than running as\r
normal, PuTTY will remove its \I{removing registry entries}registry\r
entries and \i{random seed file} from the local machine (after\r
confirming with the user).\r
\r
Note that on \i{multi-user systems}, \c{-cleanup} only removes\r
registry entries and files associated with the currently logged-in\r
user.\r
\r
\S{using-general-opts} Standard command-line options\r
\r
PuTTY and its associated tools support a range of command-line\r
options, most of which are consistent across all the tools. This\r
section lists the available options in all tools. Options which are\r
specific to a particular tool are covered in the chapter about that\r
tool.\r
\r
\S2{using-cmdline-load} \i\c{-load}: load a saved session\r
\r
\I{saved sessions, loading from command line}The \c{-load} option\r
causes PuTTY to load configuration details out of a saved session.\r
If these details include a host name, then this option is all you\r
need to make PuTTY start a session.\r
\r
You need double quotes around the session name if it contains spaces.\r
\r
If you want to create a \i{Windows shortcut} to start a PuTTY saved\r
session, this is the option you should use: your shortcut should\r
call something like\r
\r
\c d:\path\to\putty.exe -load "my session"\r
\r
(Note that PuTTY itself supports an alternative form of this option,\r
for backwards compatibility. If you execute \i\c{putty @sessionname}\r
it will have the same effect as \c{putty -load "sessionname"}. With\r
the \c{@} form, no double quotes are required, and the \c{@} sign\r
must be the very first thing on the command line. This form of the\r
option is deprecated.)\r
\r
\S2{using-cmdline-protocol} Selecting a protocol: \c{-ssh},\r
\c{-telnet}, \c{-rlogin}, \c{-raw} \c{-serial}\r
\r
To choose which protocol you want to connect with, you can use one\r
of these options:\r
\r
\b \i\c{-ssh} selects the SSH protocol.\r
\r
\b \i\c{-telnet} selects the Telnet protocol.\r
\r
\b \i\c{-rlogin} selects the Rlogin protocol.\r
\r
\b \i\c{-raw} selects the raw protocol.\r
\r
\b \i\c{-serial} selects a serial connection.\r
\r
These options are not available in the file transfer tools PSCP and\r
PSFTP (which only work with the SSH protocol).\r
\r
These options are equivalent to the \i{protocol selection} buttons\r
in the Session panel of the PuTTY configuration box (see\r
\k{config-hostname}).\r
\r
\S2{using-cmdline-v} \i\c{-v}: increase verbosity\r
\r
\I{verbose mode}Most of the PuTTY tools can be made to tell you more\r
about what they are doing by supplying the \c{-v} option. If you are\r
having trouble when making a connection, or you're simply curious,\r
you can turn this switch on and hope to find out more about what is\r
happening.\r
\r
\S2{using-cmdline-l} \i\c{-l}: specify a \i{login name}\r
\r
You can specify the user name to log in as on the remote server\r
using the \c{-l} option. For example, \c{plink login.example.com -l\r
fred}.\r
\r
These options are equivalent to the username selection box in the\r
Connection panel of the PuTTY configuration box (see\r
\k{config-username}).\r
\r
\S2{using-cmdline-portfwd} \I{-L-upper}\c{-L}, \I{-R-upper}\c{-R}\r
and \I{-D-upper}\c{-D}: set up \i{port forwardings}\r
\r
As well as setting up port forwardings in the PuTTY configuration\r
(see \k{config-ssh-portfwd}), you can also set up forwardings on the\r
command line. The command-line options work just like the ones in\r
Unix \c{ssh} programs.\r
\r
To \I{local port forwarding}forward a local port (say 5110) to a\r
remote destination (say \cw{popserver.example.com} port 110), you\r
can write something like one of these:\r
\r
\c putty -L 5110:popserver.example.com:110 -load mysession\r
\c plink mysession -L 5110:popserver.example.com:110\r
\r
To forward a \I{remote port forwarding}remote port to a local\r
destination, just use the \c{-R} option instead of \c{-L}:\r
\r
\c putty -R 5023:mytelnetserver.myhouse.org:23 -load mysession\r
\c plink mysession -R 5023:mytelnetserver.myhouse.org:23\r
\r
To \I{listen address}specify an IP address for the listening end of the\r
tunnel, prepend it to the argument:\r
\r
\c plink -L 127.0.0.5:23:localhost:23 myhost\r
\r
To set up \I{dynamic port forwarding}SOCKS-based dynamic port\r
forwarding on a local port, use the \c{-D} option. For this one you\r
only have to pass the port number:\r
\r
\c putty -D 4096 -load mysession\r
\r
For general information on port forwarding, see\r
\k{using-port-forwarding}.\r
\r
These options are not available in the file transfer tools PSCP and\r
PSFTP.\r
\r
\S2{using-cmdline-m} \i\c{-m}: \I{reading commands from a file}read\r
a remote command or script from a file\r
\r
The \i\c{-m} option performs a similar function to the \q{\ii{Remote\r
command}} box in the SSH panel of the PuTTY configuration box (see\r
\k{config-command}). However, the \c{-m} option expects to be given\r
a local file name, and it will read a command from that file.\r
\r
With some servers (particularly Unix systems), you can even put\r
multiple lines in this file and execute more than one command in\r
sequence, or a whole shell script; but this is arguably an abuse, and\r
cannot be expected to work on all servers. In particular, it is known\r
\e{not} to work with certain \q{embedded} servers, such as \i{Cisco}\r
routers.\r
\r
This option is not available in the file transfer tools PSCP and\r
PSFTP.\r
\r
\S2{using-cmdline-p} \I{-P-upper}\c{-P}: specify a \i{port number}\r
\r
The \c{-P} option is used to specify the port number to connect to. If\r
you have a Telnet server running on port 9696 of a machine instead of\r
port 23, for example:\r
\r
\c putty -telnet -P 9696 host.name\r
\c plink -telnet -P 9696 host.name\r
\r
(Note that this option is more useful in Plink than in PuTTY,\r
because in PuTTY you can write \c{putty -telnet host.name 9696} in\r
any case.)\r
\r
This option is equivalent to the port number control in the Session\r
panel of the PuTTY configuration box (see \k{config-hostname}).\r
\r
\S2{using-cmdline-pw} \i\c{-pw}: specify a \i{password}\r
\r
A simple way to automate a remote login is to supply your password\r
on the command line. This is \e{not recommended} for reasons of\r
security. If you possibly can, we recommend you set up public-key\r
authentication instead. See \k{pubkey} for details.\r
\r
Note that the \c{-pw} option only works when you are using the SSH\r
protocol. Due to fundamental limitations of Telnet and Rlogin, these\r
protocols do not support automated password authentication.\r
\r
\S2{using-cmdline-agentauth} \i\c{-agent} and \i\c{-noagent}:\r
control use of Pageant for authentication\r
\r
The \c{-agent} option turns on SSH authentication using Pageant, and\r
\c{-noagent} turns it off. These options are only meaningful if you\r
are using SSH.\r
\r
See \k{pageant} for general information on \i{Pageant}.\r
\r
These options are equivalent to the agent authentication checkbox in\r
the Auth panel of the PuTTY configuration box (see\r
\k{config-ssh-tryagent}).\r
\r
\S2{using-cmdline-agent} \I{-A-upper}\c{-A} and \i\c{-a}: control \i{agent\r
forwarding}\r
\r
The \c{-A} option turns on SSH agent forwarding, and \c{-a} turns it\r
off. These options are only meaningful if you are using SSH.\r
\r
See \k{pageant} for general information on \i{Pageant}, and\r
\k{pageant-forward} for information on agent forwarding. Note that\r
there is a security risk involved with enabling this option; see\r
\k{pageant-security} for details.\r
\r
These options are equivalent to the agent forwarding checkbox in the\r
Auth panel of the PuTTY configuration box (see \k{config-ssh-agentfwd}).\r
\r
These options are not available in the file transfer tools PSCP and\r
PSFTP.\r
\r
\S2{using-cmdline-x11} \I{-X-upper}\c{-X} and \i\c{-x}: control \i{X11\r
forwarding}\r
\r
The \c{-X} option turns on X11 forwarding in SSH, and \c{-x} turns\r
it off. These options are only meaningful if you are using SSH.\r
\r
For information on X11 forwarding, see \k{using-x-forwarding}.\r
\r
These options are equivalent to the X11 forwarding checkbox in the\r
X11 panel of the PuTTY configuration box (see \k{config-ssh-x11}).\r
\r
These options are not available in the file transfer tools PSCP and\r
PSFTP.\r
\r
\S2{using-cmdline-pty} \i\c{-t} and \I{-T-upper}\c{-T}: control\r
\i{pseudo-terminal allocation}\r
\r
The \c{-t} option ensures PuTTY attempts to allocate a\r
pseudo-terminal at the server, and \c{-T} stops it from allocating\r
one. These options are only meaningful if you are using SSH.\r
\r
These options are equivalent to the \q{Don't allocate a\r
pseudo-terminal} checkbox in the SSH panel of the PuTTY\r
configuration box (see \k{config-ssh-pty}).\r
\r
These options are not available in the file transfer tools PSCP and\r
PSFTP.\r
\r
\S2{using-cmdline-noshell} \I{-N-upper}\c{-N}: suppress starting a\r
\I{suppressing remote shell}shell or command\r
\r
The \c{-N} option prevents PuTTY from attempting to start a shell or\r
command on the remote server. You might want to use this option if\r
you are only using the SSH connection for port forwarding, and your\r
user account on the server does not have the ability to run a shell.\r
\r
This feature is only available in SSH protocol version 2 (since the\r
version 1 protocol assumes you will always want to run a shell).\r
\r
This option is equivalent to the \q{Don't start a shell or command\r
at all} checkbox in the SSH panel of the PuTTY configuration box\r
(see \k{config-ssh-noshell}).\r
\r
This option is not available in the file transfer tools PSCP and\r
PSFTP.\r
\r
\S2{using-cmdline-ncmode} \I{-nc}\c{-nc}: make a \i{remote network\r
connection} in place of a remote shell or command\r
\r
The \c{-nc} option prevents Plink (or PuTTY) from attempting to\r
start a shell or command on the remote server. Instead, it will\r
instruct the remote server to open a network connection to a host\r
name and port number specified by you, and treat that network\r
connection as if it were the main session.\r
\r
You specify a host and port as an argument to the \c{-nc} option,\r
with a colon separating the host name from the port number, like\r
this:\r
\r
\c plink host1.example.com -nc host2.example.com:1234\r
\r
You might want to use this feature if you needed to make an SSH\r
connection to a target host which you can only reach by going\r
through a proxy host, and rather than using port forwarding you\r
prefer to use the local proxy feature (see \k{config-proxy-type} for\r
more about local proxies). In this situation you might select\r
\q{Local} proxy type, set your local proxy command to be \cq{plink\r
%proxyhost -nc %host:%port}, enter the target host name on the\r
Session panel, and enter the directly reachable proxy host name on\r
the Proxy panel.\r
\r
This feature is only available in SSH protocol version 2 (since the\r
version 1 protocol assumes you will always want to run a shell). It\r
is not available in the file transfer tools PSCP and PSFTP. It is\r
available in PuTTY itself, although it is unlikely to be very useful\r
in any tool other than Plink. Also, \c{-nc} uses the same server\r
functionality as port forwarding, so it will not work if your server\r
administrator has disabled port forwarding.\r
\r
(The option is named \c{-nc} after the Unix program\r
\W{http://www.vulnwatch.org/netcat/}\c{nc}, short for \q{netcat}.\r
The command \cq{plink host1 -nc host2:port} is very similar in\r
functionality to \cq{plink host1 nc host2 port}, which invokes\r
\c{nc} on the server and tells it to connect to the specified\r
destination. However, Plink's built-in \c{-nc} option does not\r
depend on the \c{nc} program being installed on the server.)\r
\r
\S2{using-cmdline-compress} \I{-C-upper}\c{-C}: enable \i{compression}\r
\r
The \c{-C} option enables compression of the data sent across the\r
network. This option is only meaningful if you are using SSH.\r
\r
This option is equivalent to the \q{Enable compression} checkbox in\r
the SSH panel of the PuTTY configuration box (see\r
\k{config-ssh-comp}).\r
\r
\S2{using-cmdline-sshprot} \i\c{-1} and \i\c{-2}: specify an \i{SSH\r
protocol version}\r
\r
The \c{-1} and \c{-2} options force PuTTY to use version \I{SSH-1}1\r
or version \I{SSH-2}2 of the SSH protocol. These options are only\r
meaningful if you are using SSH.\r
\r
These options are equivalent to selecting your preferred SSH\r
protocol version as \q{1 only} or \q{2 only} in the SSH panel of the\r
PuTTY configuration box (see \k{config-ssh-prot}).\r
\r
\S2{using-cmdline-ipversion} \i\c{-4} and \i\c{-6}: specify an\r
\i{Internet protocol version}\r
\r
The \c{-4} and \c{-6} options force PuTTY to use the older Internet\r
protocol \i{IPv4} or the newer \i{IPv6} for most outgoing\r
connections.\r
\r
These options are equivalent to selecting your preferred Internet\r
protocol version as \q{IPv4} or \q{IPv6} in the Connection panel of\r
the PuTTY configuration box (see \k{config-address-family}).\r
\r
\S2{using-cmdline-identity} \i\c{-i}: specify an SSH \i{private key}\r
\r
The \c{-i} option allows you to specify the name of a private key\r
file in \c{*.\i{PPK}} format which PuTTY will use to authenticate with the\r
server. This option is only meaningful if you are using SSH.\r
\r
For general information on \i{public-key authentication}, see\r
\k{pubkey}.\r
\r
This option is equivalent to the \q{Private key file for\r
authentication} box in the Auth panel of the PuTTY configuration box\r
(see \k{config-ssh-privkey}).\r
\r
\S2{using-cmdline-loghost} \i\c{-loghost}: specify a \i{logical host\r
name}\r
\r
This option overrides PuTTY's normal SSH host key caching policy by\r
telling it the name of the host you expect your connection to end up\r
at (in cases where this differs from the location PuTTY thinks it's\r
connecting to). It can be a plain host name, or a host name followed\r
by a colon and a port number. See \k{config-loghost} for more detail\r
on this.\r
\r
\S2{using-cmdline-pgpfp} \i\c{-pgpfp}: display \i{PGP key fingerprint}s\r
\r
This option causes the PuTTY tools not to run as normal, but instead\r
to display the fingerprints of the PuTTY PGP Master Keys, in order to\r
aid with \i{verifying new versions}. See \k{pgpkeys} for more information.\r
\r
\S2{using-cmdline-sercfg} \i\c{-sercfg}: specify serial port\r
\i{configuration}\r
\r
This option specifies the configuration parameters for the serial\r
port (baud rate, stop bits etc). Its argument is interpreted as a\r
comma-separated list of configuration options, which can be as\r
follows:\r
\r
\b Any single digit from 5 to 9 sets the number of data bits.\r
\r
\b \cq{1}, \cq{1.5} or \cq{2} sets the number of stop bits.\r
\r
\b Any other numeric string is interpreted as a baud rate.\r
\r
\b A single lower-case letter specifies the parity: \cq{n} for none,\r
\cq{o} for odd, \cq{e} for even, \cq{m} for mark and \cq{s} for space.\r
\r
\b A single upper-case letter specifies the flow control: \cq{N} for\r
none, \cq{X} for XON/XOFF, \cq{R} for RTS/CTS and \cq{D} for\r
DSR/DTR.\r
\r
For example, \cq{-sercfg 19200,8,n,1,N} denotes a baud rate of\r
19200, 8 data bits, no parity, 1 stop bit and no flow control.\r