Usage: PUSH <variable name> <word>
  This command appends the given word to the given variable, padded with
  a space.  Note that the variable may NOT contain the leading "$";
  the command uses the variable name itself, not the expanded contents.
  If the variable does not exist, it is created containing the specified
  word (just as if it were ASSIGNed).

  PUSH is functionally equivalent to the $push() function.

See Also:
  ALIAS functions
