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wall is a Unix command line utility. When invoked, it displays the contents of a file or standard input to all logged-in users. Its name is an abbreviation of "write to all". It is typically used by root to send out shutting down message to all users just before poweroff. Invocation wall is invoked as follows: foo@bar:~$ wall <filename> To take standard input as the file, omit the filename. To write the text to send just before, pipe it with the "echo" command : foo@bar:~$ echo text to send |wall Alternatively, typing wall then enter, typing any text and pressing CTRL + D gives the same result: foo@bar:~$ wall text to send on as many lines as necessary ^D Output When invoked, wall displays the following output: Broadcast Message from foo@bar (/dev/pts/0) at 01:23 ... This is the message that would be sent. References wall(1): send message to everybody's terminal – Linux User Commands Manual v • d • e Unix command line programs and builtins (more) File system cat · cd · chmod · chown · chgrp · cksum · cmp · cp · dd · du · df · fsck · fuser · ln · ls · lsattr · lsof · mkdir  · mount · mv · pwd · rm · rmdir · split · touch  · umask Processes at · chroot · cron · exit · kill · killall · nice · pgrep · pidof · pkill · ps · pstree · sleep · time · top · wait User environment env · finger · id · logname · mesg · passwd · su · sudo · uptime · w · wall · who · whoami · write Text processing awk · comm · csplit · cut · ed · ex · fmt · head · iconv · join · less · more · paste · sed · sort · strings · talk · tail · tr · uniq · vi · wc · xargs Shell programming alias · basename · dirname · echo · expr · false · printf · test · true · unset Networking inetd · host · ifconfig · netstat · nslookup · ping · rlogin · netcat · traceroute Searching find · grep · locate · whereis · which Miscellaneous apropos · banner · bc · cal · clear · date · dd · file · help · history · info · lp · lpr · man · pax · size · tee · tput · type · uname · whatis · yes