/usr.bin/mesg/mesg.1

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  1. .\" Copyright (c) 1987, 1990, 1993
    2. 

  2. .\"	The Regents of the University of California.  All rights reserved.
    3. 

  3. .\"
    4. 

  4. .\" Redistribution and use in source and binary forms, with or without
    5. 

  5. .\" modification, are permitted provided that the following conditions
    6. 

  6. .\" are met:
    7. 

  7. .\" 1. Redistributions of source code must retain the above copyright
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  8. .\"    notice, this list of conditions and the following disclaimer.
    9. 

  9. .\" 2. Redistributions in binary form must reproduce the above copyright
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  10. .\"    notice, this list of conditions and the following disclaimer in the
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  11. .\"    documentation and/or other materials provided with the distribution.
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  12. .\" 4. Neither the name of the University nor the names of its contributors
    13. 

  13. .\"    may be used to endorse or promote products derived from this software
    14. 

  14. .\"    without specific prior written permission.
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  15. .\"
    16. 

  16. .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
    17. 

  17. .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    18. 

  18. .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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  19. .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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  20. .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    21. 

  21. .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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  22. .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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  23. .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    24. 

  24. .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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  25. .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    26. 

  26. .\" SUCH DAMAGE.
    27. 

  27. .\"
    28. 

  28. .\"	@(#)mesg.1	8.1 (Berkeley) 6/6/93
    29. 

  29. .\" $FreeBSD$
    30. 

  30. .\"
    31. 

  31. .Dd May 5, 2002
    32. 

  32. .Dt MESG 1
    33. 

  33. .Os
    34. 

  34. .Sh NAME
    35. 

  35. .Nm mesg
    36. 

  36. .Nd display (do not display) messages from other users
    37. 

  37. .Sh SYNOPSIS
    38. 

  38. .Nm
    39. 

  39. .Op Cm n | Cm y
    40. 

  40. .Sh DESCRIPTION
    41. 

  41. The
    42. 

  42. .Nm
    43. 

  43. utility is invoked by a user to control write access others
    44. 

  44. have to a terminal device.
    45. 

  45. Write access is allowed by default, and programs such as
    46. 

  46. .Xr talk 1
    47. 

  47. and
    48. 

  48. .Xr write 1
    49. 

  49. may display messages on the terminal.
    50. 

  50. .Pp
    51. 

  51. The first terminal device in the sequence of devices associated with standard
    52. 

  52. input, standard output and standard error is affected.
    53. 

  53. .Pp
    54. 

  54. The following options are available:
    55. 

  55. .Bl -tag -width indent
    56. 

  56. .It Cm n
    57. 

  57. Disallow messages.
    58. 

  58. .It Cm y
    59. 

  59. Permit messages to be displayed.
    60. 

  60. .El
    61. 

  61. .Pp
    62. 

  62. If no arguments are given,
    63. 

  63. .Nm
    64. 

  64. displays the present message status to the standard output.
    65. 

  65. .Sh EXIT STATUS
    66. 

  66. The
    67. 

  67. .Nm
    68. 

  68. utility exits with one of the following values:
    69. 

  69. .Pp
    70. 

  70. .Bl -tag -width flag -compact -offset indent
    71. 

  71. .It Li "\ 0"
    72. 

  72. Messages are allowed.
    73. 

  73. .It Li "\ 1"
    74. 

  74. Messages are not allowed.
    75. 

  75. .It Li ">1"
    76. 

  76. An error has occurred.
    77. 

  77. .El
    78. 

  78. .Sh EXAMPLES
    79. 

  79. Disallow messages from other users to the current terminal:
    80. 

  80. .Pp
    81. 

  81. .Dl "mesg n"
    82. 

  82. .Pp
    83. 

  83. Allow messages from other users to
    84. 

  84. .Pa ttyp1
    85. 

  85. (assuming you are also logged in on that terminal):
    86. 

  86. .Pp
    87. 

  87. .Dl "mesg y </dev/ttyp1"
    88. 

  88. .Sh COMPATIBILITY
    89. 

  89. Previous versions of the
    90. 

  90. .Nm
    91. 

  91. utility wrote the message status to the standard error output and
    92. 

  92. affected the terminal attached to standard error without first trying the
    93. 

  93. standard input or output devices.
    94. 

  94. .Sh SEE ALSO
    95. 

  95. .Xr biff 1 ,
    96. 

  96. .Xr talk 1 ,
    97. 

  97. .Xr wall 1 ,
    98. 

  98. .Xr write 1
    99. 

  99. .Sh STANDARDS
    100. 

  100. The
    101. 

  101. .Nm
    102. 

  102. utility conforms to
    103. 

  103. .St -p1003.1-2001 .
    104. 

  104. .Sh HISTORY
    105. 

  105. A
    106. 

  106. .Nm
    107. 

  107. command appeared in
    108. 

  108. .At v1 .
    109.