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

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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(n), lappend(n)

KEYWORDS
       append, variable

Tcl                                                                  append(n)