rrdlast - Return the date of the last data sample in an RRD
rrdtool last filename [--daemon address]
The last function returns the UNIX timestamp of the most recent update of the RRD.
The name of the RRD that contains the data.
Address of the the rrdcached manpage daemon. If specified, a flush command is sent
to the server before reading the RRD files. This allows rrdtool to return
fresh data even if the daemon is configured to cache values for a long time.
For a list of accepted formats, see the -l option in the the rrdcached manpage manual.
rrdtool last --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd
If the the rrdcached manpage daemon is being used, then omit the flush normally send before returning the last update. If you add this option, you get the last time the file on disk was updated; if you have relatively low cache times and are calling this frequently it will preserve the caching benefit
The following environment variables may be used to change the behavior of
rrdtoollast:
If this environment variable is set it will have the same effect as specifying
the --daemon option on the command line. If both are present, the command
line argument takes precedence.
Russ Wright <rwwright@home.com> Daemon support added by Steve Shipway <steve@steveshipway.org>