The command is 'wall' (write all). In some systems it can only
be executed by the administrator.
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UUCP is the abbriviation of Unix to Unix copy. It is worldwide
email system called UUCP or Unix to Unix copy.This email system was
developed for the operating system called Unix.
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No, but Linux is based on Unix since Linux is a Unix clone.
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Unix work is performed by users of the unix system, for
application and system programs, or anything that requires a Unix
system.