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32 .\" @(#)script.1 6.5 (Berkeley) 7/27/91
34 .TH SCRIPT "1" "October 2019" "util-linux" "User Commands"
36 script \- make typescript of terminal session
43 makes a typescript of everything on your terminal session. The terminal
44 data are stored in raw form to the log file and information about timing
45 to another (optional) structured log file. The timing log file is necessary to replay
48 and to store additional information about the session.
52 supports multiple streams and allows the logging of input and output to separate
53 files or all the one file. This version also supports new timing file
54 which records additional information. The command
55 .B scriptreplay \-\-summary
56 then provides all the information.
61 or option \fB\-\-log\-out\fR \fIfile\fR is given,
63 saves the dialogue in this
65 If no filename is given, the dialogue is saved in the file
68 Note that logging input using \fB\-\-log\-in\fR or \fB\-\-log\-io\fR
69 may record security-sensitive information
70 as the log file contains all terminal session input
72 independently of the terminal echo flag setting.
74 Below, the \fIsize\fR argument may be followed by the multiplicative
75 suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB
76 (the "iB" is optional, e.g., "K" has the same meaning as "KiB"), or the suffixes
77 KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB.
79 \fB\-a\fR, \fB\-\-append\fR
84 retaining the prior contents.
86 \fB\-c\fR, \fB\-\-command\fR \fIcommand\fR
89 rather than an interactive shell. This makes it easy for a script to capture
90 the output of a program that behaves differently when its stdout is not a
93 \fB\-E\fR, \fB\-\-echo\fR \fIwhen\fR
94 This option controls the ECHO flag for the pseudoterminal within the session.
95 The supported modes are
102 -- in this case, ECHO is disabled if the current standard input is a
103 terminal iin order to avoid double-echo,
104 and enabled if standard input is not a terminal
106 .BR "echo date | script" )
107 to avoid missing input in the session log.
109 \fB\-e\fR, \fB\-\-return\fR
110 Return the exit status of the child process. Uses the same format as bash
111 termination on signal termination
112 (i.e., exit status is 128 + the signal number). The exit status of
113 the child process is always stored in the type script file too.
115 \fB\-f\fR, \fB\-\-flush\fR
116 Flush output after each write. This is nice for telecooperation: one person
117 does `mkfifo foo; script \-f foo',
118 and another can supervise in real-time what is
119 being done using `cat foo'. Note that flush has an impact on performance; it's
120 possible to use SIGUSR1 to flush logs on demand.
123 Allow the default output file
125 to be a hard or symbolic link. The command will follow a symbolic link.
127 \fB\-B\fR, \fB\-\-log\-io\fR \fIfile\fR
128 Log input and output to the same
129 \fIfile\fR. Note, this option makes sense only if \fB\-\-log\-timing\fR is
130 also specified, otherwise it's impossible to separate output and input streams from
133 \fB\-I\fR, \fB\-\-log\-in\fR \fIfile\fR
134 Log input to the \fIfile\fR. The log output is disabled if only \fB\-\-log\-in\fR
137 Use this logging functionality carefully as it logs all input, including input
138 when terminal has disabled echo flag (for example, password inputs).
140 \fB\-O\fR, \fB\-\-log\-out\fR \fIfile\fR
141 Log output to the \fIfile\fR. The default is to log output to the file with
144 if the option \fB\-\-log\-out\fR or \fB\-\-log\-in\fR is not given. The log
145 output is disabled if only \fB\-\-log\-in\fR specified.
147 \fB\-T\fR, \fB\-\-log\-timing\fR \fIfile\fR
148 Log timing information to the \fIfile\fR. Two timing file formats are supported
149 now. The classic format is used when only one stream (input or output) logging
150 is enabled. The multi-stream format is used on \fB\-\-log\-io\fR or when
151 \fB\-\-log\-in\fR and \fB\-\-log\-out\fR are used together.
152 See also \fB\-\-logging\-format\fR.
154 \fB\-m\fR, \fB\-\-logging\-format\fR \fIformat\fR
159 format. The default is the classic format to log only output and the
160 advanced format when input as well as output logging is requested.
165 The log contains two fields, separated by a space. The first
166 field indicates how much time elapsed since the previous output. The second
167 field indicates how many characters were output this time.
169 .B Advanced (multi-stream) format
171 The first field is an entry type identifier
172 ('I'nput, 'O'utput, 'H'eader, 'S'ignal).
173 The socond field is how much time elapsed since the previous entry,
174 and the rest of the entry is type-specific data.
177 \fB\-o\fR, \fB\-\-output-limit\fR \fIsize\fR
178 Limit the size of the typescript and timing files to
180 and stop the child process after this size is exceeded. The calculated
181 file size does not include the start and done messages that the
183 command prepends and appends to the child process output.
184 Due to buffering, the resulting output file might be larger than the specified value.
186 \fB\-q\fR, \fB\-\-quiet\fR
187 Be quiet (do not write start and done messages to standard output).
189 \fB\-t\fR[\fIfile\fR], \fB\-\-timing\fR[=\fIfile\fR]
190 Output timing data to standard error, or to
192 when given. This option is deprecated in favour of \fB\-\-log\-timing\fR where
193 the \fIfile\fR argument is not optional.
195 \fB\-V\fR, \fB\-\-version\fR
196 Display version information and exit.
198 \fB\-h\fR, \fB\-\-help\fR
199 Display help text and exit.
204 immediately flushes the output files.
206 The following environment variable is utilized by
212 exists, the shell forked by
214 will be that shell. If
216 is not set, the Bourne shell is assumed. (Most shells set this variable
219 The script ends when the forked shell exits (a
234 Certain interactive commands, such as
236 create garbage in the typescript file.
238 works best with commands that do not manipulate the screen, the results are
239 meant to emulate a hardcopy terminal.
241 It is not recommended to run
243 in non-interactive shells. The inner shell of
245 is always interactive, and this could lead to unexpected results. If you use
247 in the shell initialization file, you have to avoid entering an infinite
248 loop. You can use for example the \fB\%.profile\fR file, which is read
249 by login shells only:
262 You should also avoid use of
266 can read more input than you would expect.
270 command appeared in 3.0BSD.
275 in the log file, including linefeeds and backspaces. This is not what the
279 is primarily designed for interactive terminal sessions. When stdin
280 is not a terminal (for example: \fBecho foo | script\fR), then the session
281 can hang, because the interactive shell within the script session misses EOF and
283 has no clue when to close the session. See the \fBNOTES\fR section for more information.
289 .BR scriptreplay (1),
292 The script command is part of the util-linux package and is available from
293 .UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/