# pt-query-digest - output into file

**URL:** <https://forums.percona.com/t/pt-query-digest-output-into-file/3876>\
**Category:** Percona Toolkit\
**Created:** [November 12, 2014, 12:13pm UTC](https://forums.percona.com/t/pt-query-digest-output-into-file/3876 "2014-11-12T12:13:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![PeterP](https://avatars.discourse-cdn.com/v4/letter/p/ccd318/32.png) [@PeterP](https://forums.percona.com/u/PeterP)\
**Post date:** [November 12, 2014, 12:13pm UTC](https://forums.percona.com/t/pt-query-digest-output-into-file/3876/1 "2014-11-12T12:13:18Z")

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Hello,

im new to percona toolkit, even after googling for hours i could not find answer.

How can i save output of pt-query-digest into file?  
Here [url][http://www.percona.com/doc/percona-toolkit/2.2/pt-query-digest.html[/url]](http://www.percona.com/doc/percona-toolkit/2.2/pt-query-digest.html%5B/url%5D)  
documentation say it should look like this pt-query-digest --log output.log msqlslow.log

but it just dont work output.log file stays empty.

Thx very much for answer.

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**Author:** ![scott.nemes](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/scott.nemes/32/5_2.png) [@scott.nemes](https://forums.percona.com/u/scott.nemes)\
**Post date:** [November 12, 2014, 3:34pm UTC](https://forums.percona.com/t/pt-query-digest-output-into-file/3876/2 "2014-11-12T15:34:04Z")

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Hi PeterP;

The --output parameter is used to specify the output type, not location. How you direct the output into a file would depend on what operating system you are running it on. For a Linux type system, simply add “\> filename.txt” to the end of your command, such as:

pt-query-digest my-slow-query.log \> my-slow-query-log.digest

-Scott

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<div class="post-metadata">

**Author:** ![PeterP](https://avatars.discourse-cdn.com/v4/letter/p/ccd318/32.png) [@PeterP](https://forums.percona.com/u/PeterP)\
**Post date:** [November 13, 2014, 8:36am UTC](https://forums.percona.com/t/pt-query-digest-output-into-file/3876/3 "2014-11-13T08:36:59Z")

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Thank you it worked!

Finaly can analyze large log with many explains.  
Maybe adding some tutorial article for absolute begginers would help more people