wdctl(8) — Linux manual page

NAME \| SYNOPSIS \| DESCRIPTION \| OPTIONS \| AUTHORS \| REPORTING BUGS \| AVAILABILITY

WDCTL(8)                  System Administration                  WDCTL(8)

NAME top

       wdctl - show hardware watchdog status

SYNOPSIS top

       wdctl [options] [device...]

DESCRIPTION top

       Show hardware watchdog status. The default device is
       /dev/watchdog. If more than one device is specified then the
       output is separated by one blank line.

       If the device is already used or user has no permissions to read
       from the device, then wdctl reads data from sysfs. In this case
       information about supported features (flags) might be missing.

       Note that the number of supported watchdog features is hardware
       specific.

OPTIONS top

       -f, --flags list
           Print only the specified flags.

       -F, --noflags
           Do not print information about flags.

       -I, --noident
           Do not print watchdog identity information.

       -n, --noheadings
           Do not print a header line for flags table.

       -o, --output list
           Define the output columns to use in table of watchdog flags.
           If no output arrangement is specified, then a default set is
           used. Use --help to get list of all supported columns.

       -O, --oneline
           Print all wanted information on one line in key="value" output
           format.

       -p, --setpretimeout seconds
           Set the watchdog pre-timeout in seconds. A watchdog
           pre-timeout is a notification generated by the watchdog before
           the watchdog reset might occur in the event the watchdog has
           not been serviced. This notification is handled by the kernel
           and can be configured to take an action using sysfs or by
           --setpregovernor.

       -g, --setpregovernor governor
           Set pre-timeout governor name. For available governors see
           default wdctl output.

       -r, --raw
           Use the raw output format.

       -s, --settimeout seconds
           Set the watchdog timeout in seconds.

       -T, --notimeouts
           Do not print watchdog timeouts.

       -x, --flags-only
           Same as -I -T.

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

       -V, --version
           Display version and exit.

AUTHORS top

       Karel Zak <[email protected]>, Lennart Poettering
       <[email protected]>

REPORTING BUGS top

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

AVAILABILITY top

       The wdctl 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
       [email protected]. This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2025-08-11. (At that time, the date of the most recent commit that
       was found in the repository was 2025-08-05.) 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 [email protected]

util-linux 2.42-start-521-ec46  2025-08-09                       WDCTL(8)