For the man page, see
http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/append.htm

   NAME  append - Append to variable

   SYNOPSIS  append varName ?value value value ...?

   DESCRIPTION   Append all of the value arguments to the current value of variable varName. If varName doesn't exist, it is given a value equal to the concatenation of all the value arguments. 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.


SEE ALSO [concat], [lappend]

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