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Diffstat (limited to 'doc/append.n')
| -rw-r--r-- | doc/append.n | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/doc/append.n b/doc/append.n index 4e86f90..b0b8216 100644 --- a/doc/append.n +++ b/doc/append.n @@ -5,10 +5,8 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: append.n,v 1.3 2000/09/07 14:27:45 poenitz Exp $ -'\" -.so man.macros .TH append n "" Tcl "Tcl Built-In Commands" +.so man.macros .BS '\" Note: do not modify the .SH NAME line immediately below! .SH NAME @@ -20,13 +18,28 @@ append \- Append to variable .SH DESCRIPTION .PP Append all of the \fIvalue\fR arguments to the current value -of variable \fIvarName\fR. If \fIvarName\fR doesn't exist, +of variable \fIvarName\fR. If \fIvarName\fR does not exist, it is given a value equal to the concatenation of all the \fIvalue\fR arguments. +The result of this command is the new value stored in variable +\fIvarName\fR. This command provides an efficient way to build up long variables incrementally. -For example, ``\fBappend a $b\fR'' is much more efficient than -``\fBset a $a$b\fR'' if \fB$a\fR is long. +For example, +.QW "\fBappend a $b\fR" +is much more efficient than +.QW "\fBset a $a$b\fR" +if \fB$a\fR is long. +.SH EXAMPLE +Building a string of comma-separated numbers piecemeal using a loop. +.CS +set var 0 +for {set i 1} {$i<=10} {incr i} { + \fBappend\fR var "," $i +} +puts $var +# Prints 0,1,2,3,4,5,6,7,8,9,10 +.CE .SH "SEE ALSO" concat(n), lappend(n) |