append(3tcl)

NAME

   append - Append to variable

SYNOPSIS

   append varName ?value value value ...?
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DESCRIPTION

   Append  all  of  the  value  arguments to the current value of variable
   varName.  If varName does not exist, it is given a value equal  to  the
   concatenation  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(3tcl), lappend(3tcl)

KEYWORDS

   append, variable

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