man7.org > Linux > man-pages

Linux/UNIX system programming training

ctrlaltdel(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | AUTHORS | SEE ALSO | REPORTING BUGS | AVAILABILITY 

CTRLALTDEL(8)             System Administration            CTRLALTDEL(8)

NAME         top

       ctrlaltdel - set the function of the Ctrl-Alt-Del combination

SYNOPSIS         top

       ctrlaltdel hard|soft

DESCRIPTION         top

       Based on examination of the linux/kernel/reboot.c code, it is
       clear that there are two supported functions that the
       <Ctrl-Alt-Del> sequence can perform.

       hard
           Immediately reboot the computer without calling sync(2) and
           without any other preparation. This is the default.

       soft
           Make the kernel send the SIGINT (interrupt) signal to the
           init process (this is always the process with PID 1). If this
           option is used, the init(8) program must support this
           feature. Since there are now several init(8) programs in the
           Linux community, please consult the documentation for the
           version that you are currently using.

       When the command is run without any argument, it will display the
       current setting.

       The function of ctrlaltdel is usually set in the /etc/rc.local
       file.

OPTIONS         top

       -h, --help
           Display help text and exit.

       -V, --version
           Print version and exit.

FILES         top

       /etc/rc.local

AUTHORS         top

       Peter Orbaek <poe@daimi.aau.dk>

SEE ALSO         top

       init(8), systemd(1)

REPORTING BUGS         top

       For bug reports, use the issue tracker at
       https://github.com/util-linux/util-linux/issues.

AVAILABILITY         top

       The ctrlaltdel command is part of the util-linux package which
       can be downloaded from Linux Kernel Archive
       <https://www.kernel.org/pub/linux/utils/util-linux/>. This page
       is part of the util-linux (a random collection of Linux
       utilities) project. Information about the project can be found at
       ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have
       a bug report for this manual page, send it to
       util-linux@vger.kernel.org. This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2023-12-22. (At that time, the date of the most recent commit
       that was found in the repository was 2023-12-14.) If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page,
       or you have corrections or improvements to the information in
       this COLOPHON (which is not part of the original manual page),
       send a mail to man-pages@man7.org

util-linux 2.39.594-1e0ad      2023-07-19                  CTRLALTDEL(8)

Pages that refer to this page: reboot(2)

HTML rendering created 2023-12-22 by Michael Kerrisk, author of The Linux Programming Interface.

For details of in-depth Linux/UNIX system programming training courses that I teach, look here.

Hosting by jambit GmbH.

Cover of TLPI