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# Exec Persistence v1
This service allows you to execute commands in the underlying OS to persist item states. It could be used to, for example, call the original
rrdtool CLI tool.
This persistence service supports only writing information, and so features such as
restoreOnStartup and sitemap Chart widgets cannot be used with this service.
This service does not have a configuration.
All item- and event-related configuration is done in the file
Aliases have special meaning because they contain the command line to execute e.g. like
"echo \"%2$tY-%2$tm-%2$td %2$tT : %1$s\""
To enhance the given command line with the current state or the current date, the service incorporates the String.format() (opens new window) method. The first parameter is always the state of the particular item, the second parameter is the current date.