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write - write to another user
write user [ ttyname ]
Write copies lines from your terminal to that of another user. When first called, it
sends the message
Message from yourname yourttyname...
The recipient of the message should write back at this point. Communication continues
until an end of file is read from the terminal or an interrupt is sent. At that point
write writes `EOT' on the other terminal and exits.
If you want to write to a user who is logged in more than once, the ttyname argument may
be used to indicate the appropriate terminal name.
Permission to write may be denied or granted by use of the mesg command. At the outset
writing is allowed. Certain commands, in particular nroff and pr(1) disallow messages in
order to prevent messy output.
If the character `!' is found at the beginning of a line, write calls the shell to execute
the rest of the line as a command.
The following protocol is suggested for using write: when you first write to another user,
wait for him to write back before starting to send. Each party should end each message
with a distinctive signal--(o) for `over' is conventional--that the other may reply. (oo)
for `over and out' is suggested when conversation is about to be terminated.
/etc/utmp to find user
/bin/sh to execute `!'
mesg(1), who(1), mail(1)
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