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Screen User's Manual

26.1 Socket Directory

The socket directory defaults either to `$HOME/.screen' or simply to `/tmp/screens' or preferably to `/usr/local/screens' chosen at compile-time. If screen is installed setuid root, then the administrator should compile screen with an adequate (not NFS mounted) SOCKDIR. If screen is not running setuid-root, the user can specify any mode 700 directory in the environment variable $SCREENDIR.