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Diffstat (limited to 'tcl8.6/doc/set.n')
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diff --git a/tcl8.6/doc/set.n b/tcl8.6/doc/set.n new file mode 100644 index 0000000..f065087 --- /dev/null +++ b/tcl8.6/doc/set.n @@ -0,0 +1,75 @@ +'\" +'\" Copyright (c) 1993 The Regents of the University of California. +'\" Copyright (c) 1994-1996 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +.TH set n "" Tcl "Tcl Built-In Commands" +.so man.macros +.BS +'\" Note: do not modify the .SH NAME line immediately below! +.SH NAME +set \- Read and write variables +.SH SYNOPSIS +\fBset \fIvarName \fR?\fIvalue\fR? +.BE +.SH DESCRIPTION +.PP +Returns the value of variable \fIvarName\fR. +If \fIvalue\fR is specified, then set +the value of \fIvarName\fR to \fIvalue\fR, creating a new variable +if one does not already exist, and return its value. +If \fIvarName\fR contains an open parenthesis and ends with a +close parenthesis, then it refers to an array element: the characters +before the first open parenthesis are the name of the array, +and the characters between the parentheses are the index within the array. +Otherwise \fIvarName\fR refers to a scalar variable. +.PP +If \fIvarName\fR includes namespace qualifiers +(in the array name if it refers to an array element), or if \fIvarName\fR +is unqualified (does not include the names of any containing namespaces) +but no procedure is active, +\fIvarName\fR refers to a namespace variable +resolved according to the rules described under \fBNAME RESOLUTION\fR in +the \fBnamespace\fR manual page. +.PP +If a procedure is active and \fIvarName\fR is unqualified, then +\fIvarName\fR refers to a parameter or local variable of the procedure, +unless \fIvarName\fR was declared to resolve differently through one of the +\fBglobal\fR, \fBvariable\fR or \fBupvar\fR commands. +.SH EXAMPLES +.PP +Store a random number in the variable \fIr\fR: +.PP +.CS +\fBset\fR r [expr {rand()}] +.CE +.PP +Store a short message in an array element: +.PP +.CS +\fBset\fR anAry(msg) "Hello, World!" +.CE +.PP +Store a short message in an array element specified by a variable: +.PP +.CS +\fBset\fR elemName "msg" +\fBset\fR anAry($elemName) "Hello, World!" +.CE +.PP +Copy a value into the variable \fIout\fR from a variable whose name is +stored in the \fIvbl\fR (note that it is often easier to use arrays in +practice instead of doing double-dereferencing): +.PP +.CS +\fBset\fR in0 "small random" +\fBset\fR in1 "large random" +\fBset\fR vbl in[expr {rand() >= 0.5}] +\fBset\fR out [\fBset\fR $vbl] +.CE +.SH "SEE ALSO" +expr(n), global(n), namespace(n), proc(n), trace(n), unset(n), upvar(n), variable(n) +.SH KEYWORDS +read, write, variable |