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[eos/base.git] / util / src / TclTk / tcl8.6.4 / doc / unset.n

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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\" Copyright (c) 2000 Ajuba Solutions.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH unset n 8.4 Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-unset \- Delete variables
-.SH SYNOPSIS
-\fBunset \fR?\fB\-nocomplain\fR? ?\fB\-\-\fR? ?\fIname name name ...\fR?
-.BE
-.SH DESCRIPTION
-.PP
-This command removes one or more variables.
-Each \fIname\fR is a variable name, specified in any of the
-ways acceptable to the \fBset\fR command.
-If a \fIname\fR refers to an element of an array then that
-element is removed without affecting the rest of the array.
-If a \fIname\fR consists of an array name with no parenthesized
-index, then the entire array is deleted.
-The \fBunset\fR command returns an empty string as result.
-If \fB\-nocomplain\fR is specified as the first argument, any possible
-errors are suppressed.  The option may not be abbreviated, in order to
-disambiguate it from possible variable names.  The option \fB\-\-\fR
-indicates the end of the options, and should be used if you wish to
-remove a variable with the same name as any of the options.
-If an error occurs during variable deletion, any variables after the named one
-causing the error are not
-deleted.  An error can occur when the named variable does not exist, or the
-name refers to an array element but the variable is a scalar, or the name
-refers to a variable in a non-existent namespace.
-.SH EXAMPLE
-.PP
-Create an array containing a mapping from some numbers to their
-squares and remove the array elements for non-prime numbers:
-.PP
-.CS
-array set squares {
-    1 1    6 36
-    2 4    7 49
-    3 9    8 64
-    4 16   9 81
-    5 25  10 100
-}
-
-puts "The squares are:"
-parray squares
-
-\fBunset\fR squares(1) squares(4) squares(6)
-\fBunset\fR squares(8) squares(9) squares(10)
-
-puts "The prime squares are:"
-parray squares
-.CE
-.SH "SEE ALSO"
-set(n), trace(n), upvar(n)
-.SH KEYWORDS
-remove, variable
-'\" Local Variables:
-'\" mode: nroff
-'\" fill-column: 78
-'\" End: