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 doesn't 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
22       long.
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EXAMPLE

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

35       concat(n), lappend(n)
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KEYWORDS

39       append, variable
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43Tcl                                                                  append(n)