append(n) Tcl Built-In Commands append(n)

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NAME append - Append to variable

SYNOPSIS append varName ?value value value ...? _________________________________________________________________

DESCRIPTION Append all of the value arguments to the current value of variable var- Name. If varName does not exist, it is given a value equal to the con- catenation of all the value arguments. The result of this command is the new value stored in variable varName. This command provides an efficient way to build up long variables incrementally. For example, append a $b is much more efficient than set a $a$b if $a is long.

EXAMPLE Building a string of comma-separated numbers piecemeal using a loop. set var 0 for {set i 1} {$i<=10} {incr i} { append var "," $i } puts $var # Prints 0,1,2,3,4,5,6,7,8,9,10

SEE ALSO concat(n), lappend(n)

KEYWORDS append, variable

Tcl append(n)