WALLSection: User Commands (1)
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NAMEwall - write a message to users
SYNOPSISwall [file ]
DESCRIPTIONWall displays the contents of file or, by default, its standard input, on the terminals of all currently logged in users.
Only the super-user can write on the terminals of users who have chosen to deny messages or are using a program which automatically denies messages.
SEE ALSOmesg(1), talk(1), write(1), shutdown(8)
HISTORYA wall command appeared in AT&T System v7 .