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OpenSolaris 2009.06 - man page for write (opensolaris section 1)

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write(1)				  User Commands 				 write(1)

       write - write to another user

       write user [terminal]

       The write utility reads lines from the user's standard input and writes them to the termi-
       nal of another user. When first invoked, it writes the message:

	 Message from sender-login-id (sending-terminal) [date]...

       to user. When it has successfully completed the connection, the sender's terminal will  be
       alerted	twice  to indicate that what the sender is typing is being written to the recipi-
       ent's terminal.

       If the recipient wants to reply, this can be accomplished by typing

	 write sender-login-id [sending-terminal]

       upon receipt of the initial message. Whenever a line of input as delimited by a	NL,  EOF,
       or  EOL	special  character  is accumulated while in canonical input mode, the accumulated
       data will be written on the other user's terminal. Characters are processed as follows:

	   o	  Typing the alert character will write the alert character  to  the  recipient's

	   o	  Typing  the  erase and kill characters will affect the sender's terminal in the
		  manner described by the termios(3C) interface.

	   o	  Typing the interrupt or end-of-file characters will cause  write  to	write  an
		  appropriate  message	(EOT\n	in  the C locale) to the recipient's terminal and

	   o	  Typing characters from LC_CTYPE classifications print or space will cause those
		  characters to be sent to the recipient's terminal.

	   o	  When	and  only  when the stty iexten local mode is enabled, additional special
		  control characters and multi-byte or single-byte characters  are  processed  as
		  printable characters if their wide character equivalents are printable.

	   o	  Typing  other  non-printable	characters  will  cause them to be written to the
		  recipient's terminal as follows: control characters will appear as a	`^'  fol-
		  lowed  by  the  appropriate ASCII character, and characters with the high-order
		  bit set will appear in "meta" notation. For example,	`\003'	is  displayed  as
		  `^C' and `\372' as `M-z'.

       To  write  to a user who is logged in more than once, the terminal argument can be used to
       indicate which terminal to write to. Otherwise, the  recipient's  terminal  is  the  first
       writable  instance  of  the  user found in /usr/adm/utmpx, and the following informational
       message will be written to the sender's standard output,  indicating  which  terminal  was

	 user is logged on more than one place.
	 You are connected to terminal.
	 Other locations are:terminal

       Permission  to  be  a  recipient of a write message can be denied or granted by use of the
       mesg utility. However, a user's privilege may further constrain the domain of  accessibil-
       ity  of other users' terminals. The write utility will fail when the user lacks the appro-
       priate privileges to perform the requested action.

       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.

       write  runs  setgid()  (see setuid(2)) to the group ID tty, in order to have write permis-
       sions on other users' terminals.

       The following protocol is suggested for using write: when you first write to another user,
       wait for them to write back before starting to send. Each person should end a message with
       a distinctive signal (that is, (o) for over) so that the other person knows when to reply.
       The signal (oo) (for over and out) is suggested when conversation is to be terminated.

       The following operands are supported:

       user	   User  (login) name of the person to whom the message will be written. This op-
		   erand must be of the form returned by the who(1) utility.

       terminal    Terminal identification in the same format provided by the who utility.

       See environ(5) for descriptions of the following environment  variables	that  affect  the
       execution of write: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.

       The following exit values are returned:

       0     Successful completion.

       >0    The addressed user is not logged on or the addressed user denies permission.

       /var/adm/utmpx	 User and accounting information for write

       /usr/bin/sh	 Bourne shell executable file

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Availability		     |SUNWcsu			   |
       |CSI			     |Enabled			   |
       |Interface Stability	     |Committed 		   |
       |Standard		     |See standards(5). 	   |

       mail(1),  mesg(1),  pr(1),  sh(1), talk(1), who(1), setuid(2), termios(3C), attributes(5),
       environ(5), standards(5)

       user is not logged on

	   The person you are trying to write to is not logged on.

       Permission denied

	   The person you are trying to write to denies that permission (with mesg).

       Warning: cannot respond, set mesg-y

	   Your terminal is set to mesg n and the recipient cannot respond to you.

       Can no longer write to user

	   The recipient has denied permission (mesg n) after you had started writing.

SunOS 5.11				    3 Nov 2000					 write(1)
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