screen: Setenv

 
 6.3 Setenv
 ==========
 
  -- 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.