wall (Unix)
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| wall | |
|---|---|
| [[Programmer|DeveloperTemplate:Pluralize from text]] | AT&T Bell Laboratories |
| Initial release | May 1975 |
| Operating system | Unix and Unix-like |
| Type | Command |
| Website | Script error: No such module "WikidataIB". |
Script error: No such module "Check for conflicting parameters".
Page Template:Mono/styles.css has no content.wall (an abbreviation of write to all) is a Unix command-line utility that displays the contents of a computer file or standard input to all logged-in users. It is typically used by root to send out shutting down message to all users just before poweroff.
Invocation
Page Template:Mono/styles.css has no content.wall reads the message from standard input by default when the filename is omitted. This is done by piping the output of the Page Template:Mono/styles.css has no content.echo command:
alice@sleipnir:~$ # `tty` to show the current terminal name
alice@sleipnir:~$ tty
/dev/pts/7
alice@sleipnir:~$ echo Remember to brush your teeth! | wall
The message may also be typed in much the same way Page Template:Mono/styles.css has no content.cat is used: invoking Page Template:Mono/styles.css has no content.wall by typing Page Template:Kbd/styles.css has no content.wall and pressing Script error: No such module "key". followed by a message, pressing Script error: No such module "key". and Script error: No such module "key".+Script error: No such module "key".:
alice@sleipnir:~$ wall
Remember to brush your teeth!
^D
Using a here-string:
alice@sleipnir:~$ wall <<< 'Remember to brush your teeth!'
Reading from a file is also supported:
alice@sleipnir:~$ cat .important_announcement
Remember to brush your teeth!
alice@sleipnir:~$ wall .important_announcement # same as `wall !$`
All the commands above should display the following output on terminals that users allow write access to (see mesg(1)):
Broadcast Message from alice@sleipnir
(/dev/pts/7) at 16:15 ...
Remember to brush your teeth!
See also
References
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