diff options
author | William Joye <wjoye@cfa.harvard.edu> | 2016-12-21 22:56:22 (GMT) |
---|---|---|
committer | William Joye <wjoye@cfa.harvard.edu> | 2016-12-21 22:56:22 (GMT) |
commit | d1a6de55efc90f190dee42ab8c4fa9070834e77d (patch) | |
tree | ec633f5608ef498bee52a5f42c12c49493ec8bf8 /tcl8.6/doc/unset.n | |
parent | 5514e37335c012cc70f5b9aee3cedfe3d57f583f (diff) | |
parent | 98acd3f494b28ddd8c345a2bb9311e41e2d56ddd (diff) | |
download | blt-d1a6de55efc90f190dee42ab8c4fa9070834e77d.zip blt-d1a6de55efc90f190dee42ab8c4fa9070834e77d.tar.gz blt-d1a6de55efc90f190dee42ab8c4fa9070834e77d.tar.bz2 |
Merge commit '98acd3f494b28ddd8c345a2bb9311e41e2d56ddd' as 'tcl8.6'
Diffstat (limited to 'tcl8.6/doc/unset.n')
-rw-r--r-- | tcl8.6/doc/unset.n | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/tcl8.6/doc/unset.n b/tcl8.6/doc/unset.n new file mode 100644 index 0000000..2cfc63e --- /dev/null +++ b/tcl8.6/doc/unset.n @@ -0,0 +1,68 @@ +'\" +'\" 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: |