bionic (3) append.3tcl.gz

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