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NAME
wall - write a message to usersSYNOPSIS
wall [file ]DESCRIPTION
Wall 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.
Reading from a file is refused when the invoker is not superuser and the program is suid or sgid.
SEE ALSO
mesg(1), talk(1), write(1), shutdown(8)HISTORY
A wall command appeared in AT&T System v7 .AVAILABILITY
The wall command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
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Time: 15:26:02 GMT, June 11, 2010