GNU Info

(screen.info)Setenv

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Setenv
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 - Command: setenv var string
     (none)
     Set the environment variable VAR to value STRING.  If only VAR is
     specified, the user will be prompted to enter a value.  If no
     parameters are specified, the user will be prompted for both
     variable and value. The environment is inherited by all
     subsequently forked shells.

 - Command: unsetenv var
     (none)
     Unset an environment variable.