write (Unix)

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write
Cross-platform
TypeCommand

In

utility used to send messages to another user by writing a message directly to another user's TTY.[1]

History

The write command was included in the First Edition of the Research Unix operating system.[2] A similar command appeared in Compatible Time-Sharing System.[3]

Sample usage

The syntax for the write command is: 

$ write user [tty]
message

The write session is terminated by sending EOF, which can be done by pressing Ctrl+D. The tty argument is only necessary when a user is logged into more than one terminal.[4]

A conversation initiated between two users on the same machine: 

$ write root pts/7
test

Will show up to the user on that console as: 

Message from root@wiki on pts/8 at 11:19 ...
test

See also

The Wikibook Guide to Unix has a page on the topic of: Commands

References

  1. ^ write(1) – Version 7 Unix Programmer's Manual
  2. ^ Unix Programmer's Manual (PDF) (1st ed.). Bell Labs. 3 November 1971. p. write(1). Archived from the original (PDF) on 9 July 2016. Retrieved 9 July 2016.
  3. ISBN 9783863096236
    . The basic concept of sending instantaneously messages to logged in users came with ... CTSS ...
  4. ^ write(1) – util-linux man page
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