/listvar
  Usage:
  /LISTVAR [-mmatching] [-gxsv] [name [value]]
  Options:
  
  - -mmatching
      
- Determines matching style used for comparison of
      name and value.
      If omitted, the style is determined by
      %{matching}.
  
- -g
      
- List only global (unexported) variables.
  
- -x
      
- List only variables that are exported to the environment.
  
- -s
      
- Short format: list variable names only.
  
- -v
      
- List values only.
  
  /Listvar lists values of
  variables whose name and value
  match name and value according to matching,
  sorted by name.
  If neither -g nor -x is given, global and
  environment variables are listed.
  The return value of /listvar
  is the number of variables listed.
  See: variables,
  /set,
  /setenv,
  /export,
  /let,
  /unset
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  Copyright © 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2004, 2005, 2006-2007 Ken Keys