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UnSetEnv
NAME,SAVE/S
C:
Unsets a global variable from the current shell. These variables can be accessed from any program executing at any time. These variables are usually not saved in the ENVARC: directory, hence they can only be used by programs during the current execution of the operating system. If set using SAVE argument, the variable is also saved in ENVARC: and can then be deleted there by UnSetEnv with the SAVE argument. If no parameter is specified, the current list of global variables is displayed.
NAME - The name of the global variable to unset. SAVE - Unset (delete) the variable also in ENVARC:
Standard DOS error codes.
UnSetEnv EDITOR SAVE
Any program that accesses the variable "EDITOR" (like More and
MultiView) are able to find out the name of the text-editor the
user would like to use, by examining the contents of the variable.
This command would delete this variable in Ram (in ENV:) _and_ in
ENVARC: (assuming it was already set there, for example by the use
of the SAVE argument of SetEnv).