# Share your custom Actions **URL:** https://community.mp3tag.de/t/share-your-custom-actions/1722 **Category:** General Discussion **Created:** [February 21, 2005, 2:01am UTC](https://community.mp3tag.de/t/share-your-custom-actions/1722 "2005-02-21T02:01:42Z") **Posts on this page:** 1 **Showing post:** 33
### Author: ![DetlevD](https://community.mp3tag.de/user_avatar/community.mp3tag.de/detlevd/32/123_2.png) [@DetlevD](https://community.mp3tag.de/u/DetlevD) #### Post date: [April 12, 2011, 2:26am UTC](https://community.mp3tag.de/t/share-your-custom-actions/1722/33 "2011-04-12T02:26:02Z")
Here is a 'Format value' action, which set up a tag-field FILENAME\_NEW from tag-fields TRACK, ARTIST, ALBUM, TITLE in a dynamically way. A not existing tag-field will not be used to create the new filename. At least one of those tag-fields should be exist, otherwise the new filename will be empty, that means, FILENAME\_NEW will not be created. The action formatstring uses the '**[...]** square bracket clamb' operator to check the existence of a tag-field and the ' **$trimLeft**' function to remove unwanted leading space and hyphen characters. _Actiontype 5:_ **Format value** _Field:_ **FILENAME\_NEW** _Formatstring:_ **$trimLeft([$num(%TRACK%,2)][' - '%ARTIST%][' - '%ALBUM%][' - '%TITLE%],' -')** The result can vary ... 01 01 - album 01 - album - title 01 - artist 01 - artist - album 01 - artist - album - title 01 - artist - title 01 - title album album - title artist artist - album artist - album - title artist - title title The following modified Formatstring creates a value even when all given tag-fields are empty ... **$if2($trimLeft([$num(%TRACK%,2)][' - '%ARTIST%][' - '%ALBUM%][' - '%TITLE%],' -'),$num(%\_counter%,2)' - Unknown')** DD.20110412.1006.CEST --- _[View the full topic](https://community.mp3tag.de/t/share-your-custom-actions/1722)._