|Original author(s)||Dennis Ritchie,|
|Developer(s)||AT&T Bell Laboratories|
|Initial release||November 3, 1971|
|Operating system||Unix and Unix-like|
In Unix and Unix-like operating systems, write is a utility used to send messages to another user by writing a message directly to another user's TTY.
The write command was included in the First Edition of the Research Unix operating system. A similar command appeared in Compatible Time-Sharing System.
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.
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
write(1)– Version 7 Unix Programmer's Manual
The basic concept of sending instantaneously messages to logged in users came with ... CTSS ...