EnglishFrenchSpanish

Ad


OnWorks favicon

mesgposix - Online in the Cloud

Run mesgposix in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command mesgposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


mesg — permit or deny messages

SYNOPSIS


mesg [y|n]

DESCRIPTION


The mesg utility shall control whether other users are allowed to send messages via write,
talk, or other utilities to a terminal device. The terminal device affected shall be
determined by searching for the first terminal in the sequence of devices associated with
standard input, standard output, and standard error, respectively. With no arguments, mesg
shall report the current state without changing it. Processes with appropriate privileges
may be able to send messages to the terminal independent of the current state.

OPTIONS


None.

OPERANDS


The following operands shall be supported in the POSIX locale:

y Grant permission to other users to send messages to the terminal device.

n Deny permission to other users to send messages to the terminal device.

STDIN


Not used.

INPUT FILES


None.

ENVIRONMENT VARIABLES


The following environment variables shall affect the execution of mesg:

LANG Provide a default value for the internationalization variables that are unset or
null. (See the Base Definitions volume of POSIX.1‐2008, Section 8.2,
Internationalization Variables for the precedence of internationalization
variables used to determine the values of locale categories.)

LC_ALL If set to a non-empty string value, override the values of all the other
internationalization variables.

LC_CTYPE Determine the locale for the interpretation of sequences of bytes of text data
as characters (for example, single-byte as opposed to multi-byte characters in
arguments).

LC_MESSAGES
Determine the locale that should be used to affect the format and contents of
diagnostic messages written (by mesg) to standard error.

NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES.

ASYNCHRONOUS EVENTS


Default.

STDOUT


If no operand is specified, mesg shall display the current terminal state in an
unspecified format.

STDERR


The standard error shall be used only for diagnostic messages.

OUTPUT FILES


None.

EXTENDED DESCRIPTION


None.

EXIT STATUS


The following exit values shall be returned:

0 Receiving messages is allowed.

1 Receiving messages is not allowed.

>1 An error occurred.

CONSEQUENCES OF ERRORS


Default.

The following sections are informative.

APPLICATION USAGE


The mechanism by which the message status of the terminal is changed is unspecified.
Therefore, unspecified actions may cause the status of the terminal to change after mesg
has successfully completed. These actions may include, but are not limited to: another
invocation of the mesg utility, login procedures; invocation of the stty utility,
invocation of the chmod utility or chmod() function, and so on.

EXAMPLES


None.

RATIONALE


The terminal changed by mesg is that associated with the standard input, output, or error,
rather than the controlling terminal for the session. This is because users logged in more
than once should be able to change any of their login terminals without having to stop the
job running in those sessions. This is not a security problem involving the terminals of
other users because appropriate privileges would be required to affect the terminal of
another user.

The method of checking each of the first three file descriptors in sequence until a
terminal is found was adopted from System V.

The file /dev/tty is not specified for the terminal device because it was thought to be
too restrictive. Typical environment changes for the n operand are that write permissions
are removed for others and group from the appropriate device. It was decided to leave the
actual description of what is done as unspecified because of potential differences between
implementations.

The format for standard output is unspecified because of differences between historical
implementations. This output is generally not useful to shell scripts (they can use the
exit status), so exact parsing of the output is unnecessary.

FUTURE DIRECTIONS


None.

Use mesgposix online using onworks.net services


Free Servers & Workstations

Download Windows & Linux apps

  • 1
    AstrOrzPlayer
    AstrOrzPlayer
    AstrOrz Player is a free media player
    software, part based on WMP and VLC. The
    player is in a minimalist style, with
    more than ten theme colors, and can also
    b...
    Download AstrOrzPlayer
  • 2
    movistartv
    movistartv
    Kodi Movistar+ TV es un ADDON para XBMC/
    Kodi que permite disponer de un
    decodificador de los servicios IPTV de
    Movistar integrado en uno de los
    mediacenters ma...
    Download movistartv
  • 3
    Code::Blocks
    Code::Blocks
    Code::Blocks is a free, open-source,
    cross-platform C, C++ and Fortran IDE
    built to meet the most demanding needs
    of its users. It is designed to be very
    extens...
    Download Code::Blocks
  • 4
    Amidst
    Amidst
    Amidst or Advanced Minecraft Interface
    and Data/Structure Tracking is a tool to
    display an overview of a Minecraft
    world, without actually creating it. It
    can ...
    Download Amidst
  • 5
    MSYS2
    MSYS2
    MSYS2 is a collection of tools and
    libraries providing you with an
    easy-to-use environment for building,
    installing and running native Windows
    software. It con...
    Download MSYS2
  • 6
    libjpeg-turbo
    libjpeg-turbo
    libjpeg-turbo is a JPEG image codec
    that uses SIMD instructions (MMX, SSE2,
    NEON, AltiVec) to accelerate baseline
    JPEG compression and decompression on
    x86, x8...
    Download libjpeg-turbo
  • More »

Linux commands

  • 1
    abi-tracker
    abi-tracker
    abi-tracker - visualize ABI changes
    timeline of a C/C++ software library.
    DESCRIPTION: NAME: ABI Tracker
    (abi-tracker) Visualize ABI changes
    timeline of a C/C+...
    Run abi-tracker
  • 2
    abicheck
    abicheck
    abicheck - check application binaries
    for calls to private or evolving symbols
    in libraries and for static linking of
    some system libraries. ...
    Run abicheck
  • 3
    couriermlm
    couriermlm
    couriermlm - The Courier mailing list
    manager ...
    Run couriermlm
  • 4
    couriertcpd
    couriertcpd
    couriertcpd - the Courier mail server
    TCP server daemon ...
    Run couriertcpd
  • 5
    gbklatex
    gbklatex
    bg5latex - Use LaTeX directly on a Big5
    encodedtex file bg5pdflatex - Use
    pdfLaTeX directly on a Big5 encodedtex
    file bg5+latex - Use LaTeX directly on a
    Big5+...
    Run gbklatex
  • 6
    gbkpdflatex
    gbkpdflatex
    bg5latex - Use LaTeX directly on a Big5
    encodedtex file bg5pdflatex - Use
    pdfLaTeX directly on a Big5 encodedtex
    file bg5+latex - Use LaTeX directly on a
    Big5+...
    Run gbkpdflatex
  • More »

Ad