[role="xpack"]
[testenv="gold+"]
[[elasticsearch-croneval]]
== elasticsearch-croneval

Validates and evaluates a cron expression. 

[discrete]
=== Synopsis

[source,shell]
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bin/elasticsearch-croneval <expression>
[-c, --count <integer>] [-h, --help]
([-s, --silent] | [-v, --verbose])
--------------------------------------------------

[discrete]
=== Description

This command enables you to verify that your
https://en.wikipedia.org/wiki/Cron[cron] expressions are valid for use with the
{es} {alert-features} and produce the expected results.

This command is provided in the `$ES_HOME/bin` directory.

[discrete]
=== Parameters

`-c, --count` <Integer>::
  The number of future times this expression will be triggered. The default
  value is `10`.

`-d, --detail`::
  Shows detail for invalid cron expression. It will print the stacktrace if the
  expression is not valid.

`-h, --help`::
  Returns all of the command parameters.

`-s, --silent`::
  Shows minimal output.
                                 
`-v, --verbose`::
  Shows verbose output.

[discrete]
=== Examples

If the cron expression is valid, the following command displays the next
20 times that the schedule will be triggered:

[source,bash]
--------------------------------------------------
bin/elasticsearch-croneval "0 0/1 * * * ?" -c 20
--------------------------------------------------