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/usr.bin/mesg/mesg.1

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 28.\"	@(#)mesg.1	8.1 (Berkeley) 6/6/93
 29.\" $FreeBSD$
 30.\"
 31.Dd May 5, 2002
 32.Dt MESG 1
 33.Os
 34.Sh NAME
 35.Nm mesg
 36.Nd display (do not display) messages from other users
 37.Sh SYNOPSIS
 38.Nm
 39.Op Cm n | Cm y
 40.Sh DESCRIPTION
 41The
 42.Nm
 43utility is invoked by a user to control write access others
 44have to a terminal device.
 45Write access is allowed by default, and programs such as
 46.Xr talk 1
 47and
 48.Xr write 1
 49may display messages on the terminal.
 50.Pp
 51The first terminal device in the sequence of devices associated with standard
 52input, standard output and standard error is affected.
 53.Pp
 54The following options are available:
 55.Bl -tag -width indent
 56.It Cm n
 57Disallow messages.
 58.It Cm y
 59Permit messages to be displayed.
 60.El
 61.Pp
 62If no arguments are given,
 63.Nm
 64displays the present message status to the standard output.
 65.Sh EXIT STATUS
 66The
 67.Nm
 68utility exits with one of the following values:
 69.Pp
 70.Bl -tag -width flag -compact -offset indent
 71.It Li "\ 0"
 72Messages are allowed.
 73.It Li "\ 1"
 74Messages are not allowed.
 75.It Li ">1"
 76An error has occurred.
 77.El
 78.Sh EXAMPLES
 79Disallow messages from other users to the current terminal:
 80.Pp
 81.Dl "mesg n"
 82.Pp
 83Allow messages from other users to
 84.Pa ttyp1
 85(assuming you are also logged in on that terminal):
 86.Pp
 87.Dl "mesg y </dev/ttyp1"
 88.Sh COMPATIBILITY
 89Previous versions of the
 90.Nm
 91utility wrote the message status to the standard error output and
 92affected the terminal attached to standard error without first trying the
 93standard input or output devices.
 94.Sh SEE ALSO
 95.Xr biff 1 ,
 96.Xr talk 1 ,
 97.Xr wall 1 ,
 98.Xr write 1
 99.Sh STANDARDS
100The
101.Nm
102utility conforms to
103.St -p1003.1-2001 .
104.Sh HISTORY
105A
106.Nm
107command appeared in
108.At v1 .