V4/man/man3/mesg.3

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.th MESG III 3/15/72
.sh NAME
mesg  \*-  write message on typewriter
.sh SYNOPSIS
.ft B
jsr	r5,mesg; <Now is the time\\0>; .even
.ft R
.sh DESCRIPTION
.it Mesg
writes the string immediately following its call onto
the standard output file.
The string must be terminated by an ASCII NULL byte.
.sh BUGS