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screen: Socket Directory

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

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