wall man page on Archlinux

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WALL(1)				 User Commands			       WALL(1)

       wall - write a message to users

       wall [-n] [-t timeout] [message | file]

       wall  displays  a message or the contents of a file or, by default, its
       standard input, on the terminals of all currently logged in users.  The
       command	will  wrap  lines  that	 are longer than 79 characters.	 Short
       lines are whitespace padded to have 79 characters.   The	 command  will
       always put a carriage return and new line at the end of each line.

       Only  the superuser can write on the terminals of users who have chosen
       to deny messages or are using a program which automatically denies mes‐

       Reading	from  a	 file is refused when the invoker is not superuser and
       the program is suid or sgid.

       -n, --nobanner
	      Suppress the banner.

       -t, --timeout timeout
	      Abandon the write attempt to the terminals  after	 timeout  sec‐
	      onds.   This  timeout  must  be a positive integer.  The default
	      value is 300 seconds, which is a legacy from the time when  peo‐
	      ple ran terminals over modem lines.

       -V, --version
	      Display version information and exit.

       -h, --help
	      Display help text and exit.

       Some  sessions,	such  as  wdm,	that  have in the beginning of utmp(5)
       ut_type data a ':' character will not get the message from wall.	  This
       is done to avoid write errors.

       mesg(1), talk(1), write(1), shutdown(8)

       A wall command appeared in Version 7 AT&T UNIX.

       The  wall  command  is  part of the util-linux package and is available
       from Linux Kernel  Archive  ⟨ftp://ftp.kernel.org/pub/linux/utils/util-

util-linux			  August 2013			       WALL(1)

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