1append(n)                    Tcl Built-In Commands                   append(n)
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NAME

8       append - Append to variable
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SYNOPSIS

11       append varName ?value value value ...?
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DESCRIPTION

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

24       Building a string of comma-separated numbers piecemeal using a loop.
25              set var 0
26              for {set i 1} {$i<=10} {incr i} {
27                 append var "," $i
28              }
29              puts $var
30              # Prints 0,1,2,3,4,5,6,7,8,9,10
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SEE ALSO

34       concat(n), lappend(n)
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KEYWORDS

38       append, variable
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42Tcl                                                                  append(n)