Hi everyone, I have a text with blocks similar following [FILE] <tu origin="tbx" tuid="32316" vuid="32316" filename="/some/path/to/a/file" SwKey="SomeStringIncluding_-:&$" xml:space="preserve" Inst="1" filetype=".txt"> <tuv xml:lang="EN-US"> <seg>Hide Process &Tool Tips</seg> </tuv> <tuv xml:lang="DE-DE"> <seg>&QuickInfo ausblenden</seg> </tuv> </tu> [/FILE] and I would like to remove blocks with text matching e.g. "SomeStringIncluding_-:&$" and keep rest of the file I have found another post and tried to adapt the code to my file but as there is no explanation to the code I am struggling, here is the sed script I am using [SED_CODE] s/>/\>/g s/</\</g /^\s*$/d /^\s*\<\/tu\>/G /./{H;;} x;/SomeStringIncluding_-:\&\$/d; s/\>/>/g s/\</</g /^$/d [/SED_CODE] I will be glad if you have time to explain the code as well, so next time I can stand on my own feet Thanks in advance

use awk awk 'BEGIN{RS="[[]/FILE[]]"}/SomeString/{printf "%s", $0;print RT}' file

I am not sure that I understand, When I run that command the output was the same as input