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append - Append to variable
append varName ?value value value ...? _________________________________________________________________
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.
append, variable