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32 | .\" @(#)mesg.1 8.1 (Berkeley) 6/6/93 | |
33 | .\" | |
6e72fa59 | 34 | .TH MESG 1 "July 2014" "util-linux" "User Commands" |
6dbe3af9 | 35 | .SH NAME |
6e72fa59 | 36 | mesg \- display (or do not display) messages from other users |
6dbe3af9 | 37 | .SH SYNOPSIS |
8d604700 | 38 | .B mesg |
6e72fa59 | 39 | [option] |
8d604700 | 40 | .RB [ n | y ] |
6dbe3af9 | 41 | .SH DESCRIPTION |
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42 | The |
43 | .B mesg | |
6e72fa59 BS |
44 | utility is invoked by a user to control write access others have to the |
45 | terminal device associated with standard error output. If write access | |
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46 | is allowed, then programs such as |
47 | .BR talk (1) | |
48 | and | |
49 | .BR write (1) | |
50 | may display messages on the terminal. | |
51 | .PP | |
52 | Traditionally, write access is allowed by default. However, as users | |
53 | become more conscious of various security risks, there is a trend to remove | |
54 | write access by default, at least for the primary login shell. To make | |
55 | sure your ttys are set the way you want them to be set, | |
56 | .B mesg | |
57 | should be executed in your login scripts. | |
e1167ce2 | 58 | .SH ARGUMENTS |
726f69e2 KZ |
59 | .TP |
60 | .B n | |
6e72fa59 | 61 | Disallow messages. |
726f69e2 KZ |
62 | .TP |
63 | .B y | |
6e72fa59 BS |
64 | Allow messages to be displayed. |
65 | .PP | |
66 | If no arguments are given, | |
67 | .B mesg | |
68 | shows the current message status on standard error output. | |
e1167ce2 | 69 | .SH OPTIONS |
ea87bbf6 | 70 | .TP |
6e72fa59 | 71 | .BR \-v , " \-\-verbose" |
849c6ea3 SK |
72 | Explain what is being done. |
73 | .TP | |
6e72fa59 | 74 | .BR \-V , " \-\-version" |
b4362b6f | 75 | Display version information and exit. |
ea87bbf6 | 76 | .TP |
6e72fa59 | 77 | .BR \-h , " \-\-help" |
b4362b6f | 78 | Display help text and exit. |
6e72fa59 | 79 | .SH EXIT STATUS |
726f69e2 KZ |
80 | The |
81 | .B mesg | |
82 | utility exits with one of the following values: | |
6e72fa59 | 83 | .RS 4 |
726f69e2 | 84 | .TP |
6e72fa59 | 85 | .B "\ 0" |
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86 | Messages are allowed. |
87 | .TP | |
6e72fa59 | 88 | .B "\ 1" |
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89 | Messages are not allowed. |
90 | .TP | |
6e72fa59 | 91 | .B ">1" |
726f69e2 | 92 | An error has occurred. |
6e72fa59 | 93 | .RE |
726f69e2 KZ |
94 | .SH FILES |
95 | .I /dev/[pt]ty[pq]? | |
96 | .SH "SEE ALSO" | |
f053ff1e | 97 | .BR login (1), |
726f69e2 KZ |
98 | .BR talk (1), |
99 | .BR write (1), | |
100 | .BR wall (1), | |
726f69e2 KZ |
101 | .BR xterm (1) |
102 | .SH HISTORY | |
103 | A | |
104 | .B mesg | |
105 | command appeared in Version 6 AT&T UNIX. | |
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106 | |
107 | .SH AVAILABILITY | |
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108 | The mesg command is part of the util-linux package and is available from |
109 | ftp://ftp.kernel.org/pub/linux/utils/util-linux/. |