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(screen.info)Socket Directory

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