CentOS 7.0 - man page for systemd-notify (centos section 1)
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SYSTEMD-NOTIFY(1) systemd-notify SYSTEMD-NOTIFY(1)
systemd-notify - Notify service manager about start-up completion and other daemon status
systemd-notify [OPTIONS...] [VARIABLE=VALUE...]
systemd-notify 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
This is mostly just a wrapper around sd_notify() and makes this functionality available to
shell scripts. For details see sd_notify(3).
The command line may carry a list of environment variables to send as part of the status
Note that systemd will refuse reception of status updates from this command unless
NotifyAccess=all is set for the service unit this command is called from.
The following options are understood:
Prints a short help text and exits.
Prints a short version string and exits.
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 systemd-notify is used.
This is equivalent to systemd-notify MAINPID=$PID. For details about the semantics of
this option see sd_notify(3).
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 sd_notify(3).
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 sd_booted(3).
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
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..."
systemd(1), systemctl(1), systemd.unit(5), sd_notify(3), sd_booted(3)
systemd 208 SYSTEMD-NOTIFY(1)
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