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WRITE(1)                    General Commands Manual                   WRITE(1)

       write - write a message to another user

       write username [ ttyname ]

       write copies lines from your standard input to username's screen.

       When  you  type  a  write command, the person you are writing to sees a
       message like this:

              Message from hostname!yourname on yourttyname at hh:mm ...

       After typing the write command, enter the text of your  message.   What
       you  type appears line-by-line on the other user's screen.  Conclude by
       typing an EOF indication (CTRL-D) or an interrupt.  At this point write
       displays EOF on your recipient's screen and exits.

       To  write  to  a  user who is logged in more than once, use the ttyname
       argument to indicate the appropriate terminal name.

       You can grant or deny other users permission to write to you  by  using
       the  mesg command (default allows writing).  Certain commands, nroff(1)
       and pr(1V) in particular, do not allow anyone to write to you while you
       are using them in order to prevent messy output.

       If  write finds the character `!'  at the beginning of a line, it calls
       the shell to execute the rest of the line as a command.

       Two people can carry on a conversation  by  "writing"  to  each  other.
       When  the  other person receives the message indicating you are writing
       to him, he can then write back to you if he wishes.  However, since you
       are  now  simultaneously typing and receiving messages, you end up with
       garbage on your screen unless you work  out  some  sort  of  scheduling
       scheme  with  your  partner.   You might try the following conventional
       protocol: when you first write to another user, wait for him  to  write
       back before starting to send.  Each person should end each message with
       a distinctive signal -- -o- (for "over") is standard  --  so  that  the
       other knows when to begin a reply.  To end your conversation, type -oo-
       (for "over and out") before finishing the conversation.

       Here is an example of a short dialog between two  people  on  different
       terminals.   Two  users called "Horace" and "Eudora" are logged in on a
       system called "jones".  To illustrate the process, both users'  screens
       are shown side-by-side:
       Eudora's Terminal                                 Horace's Terminal
                                                Horace is staring at his screen
       jones% write  horace
       how about a squash game tonight? -o-
                                                Message from jones!eudora on tty09 at 17:05 ...
                                                how about a squash game tonight? -o-
                                                jones% write  eudora
                                                I'm playing tiddlywinks with Carmeline -o-
       Message from jones!horace on tty03 at 17:06 ...
       I'm playing tiddlywinks with Carmeline -o-
       How about the beach on Sunday? -o-
                                                How about the beach on Sunday? -o-
                                                Sorry, I'm washing my tent that day -o-
       Sorry, I'm washing my tent that day -o-
       See you when I get back from Peru -oo-
                                                See you when I get back from Peru -oo-
       jones%                                   EOF
                                                I hear rack of llama is very tasty -oo-
       I hear rack of llama is very tasty -oo-
       EOF                                      jones%

       The  environment  variables  LC_CTYPE, LANG, and LC_default control the
       character classification throughout write.  On entry  to  write,  these
       environment  variables  are  checked  in the following order: LC_CTYPE,
       LANG, and LC_default.  When a valid value is found, remaining  environ-
       ment  variables for character classification are ignored.  For example,
       a new setting for LANG does not override the  current  valid  character
       classification  rules  of  LC_CTYPE.  When none of the values is valid,
       the shell character classification defaults to the POSIX.1 "C" locale.

       /etc/utmp           to find user
       /usr/bin/sh         to execute !

       mail(1), mesg(1), pr(1V), talk(1), troff(1), who(1), locale(5)

                                2 October 1989                        WRITE(1)