Usage:
/LISTVAR [-mmatching] [-gxsv] [name [value]]
/Listvar lists values of
variables whose name and value
match name and value according to matching.
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