Section: systemd-notify (1)
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systemd-notify - Notify service manager about start-up completion and other daemon status changes
systemd-notify [OPTIONS...] [VARIABLE=VALUE...]
may be called by daemon scripts to notify the init system about status changes. It can be used to send arbitrary information, encoded in an environment-block-like list of strings. Most importantly it can be used for start-up completion notification.
This is mostly just a wrapper around
and makes this functionality available to shell scripts. For details see
The command line may carry a list of environment variables to send as part of the status update.
Note that systemd will refuse reception of status updates from this command unless
is set for the service unit this command is called from.
The following options are understood:
Inform the init system about service start-up completion. This is equivalent to
systemd-notify READY=1. For details about the semantics of this option see
Inform the init system about the main PID of the daemon. Takes a PID as argument. If the argument is omitted, the PID of the process that invoked
is used. This is equivalent to
systemd-notify MAINPID=$PID. For details about the semantics of this option see
Send a free-form status string for the daemon to the init systemd. This option takes the status string as argument. This is equivalent to
systemd-notify STATUS=.... For details about the semantics of this option see
Returns 0 if the system was booted up with systemd, non-zero otherwise. If this option is passed, no message is sent. This option is hence unrelated to the other options. For details about the semantics of this option, see
Controls disk read-ahead operations. The argument must be a string, and either "cancel", "done" or "noreplay". For details about the semantics of this option see
Print a short help text and exit.
Print a short version string and exit.
On success, 0 is returned, a non-zero failure code otherwise.
Example 1. Start-up Notification and Status Updates
A simple shell daemon that sends start-up notifications after having set up its communication channel. During runtime it sends further status updates to the init system:
systemd-notify --ready --status="Waiting for data..."
while : ; do
read a < /tmp/waldo
systemd-notify --status="Processing $a"
# Do something with $a ...
systemd-notify --status="Waiting for data..."
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- SEE ALSO