GNU Info

(screen.info)Lock

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Lock
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 - Command: lockscreen
     (`C-a x', `C-a C-x')
     Call a screenlock program (`/local/bin/lck' or `/usr/bin/lock' or
     a builtin, if no other is available). Screen does not accept any
     command keys until this program terminates. Meanwhile processes in
     the windows may continue, as the windows are in the detached state.
     The screenlock program may be changed through the environment
     variable `$LOCKPRG' (which must be set in the shell from which
     `screen' is started) and is executed with the user's uid and gid.

     Warning: When you leave other shells unlocked and have no password
     set on `screen', the lock is void: One could easily re-attach from
     an unlocked shell. This feature should rather be called
     `lockterminal'.