Sites like opensubtitles.org have the annoying habit of tagging their files with subtitles like “Tip for download: Open Subtitles MKV Player” and “Downloaded from http://www.opensubtitles.org”.
Here is a fast single command to get rid of all that on all subrip (.srt) files, using find, sed, and a bit of regex:
find . -name \*.srt -execdir sed -i '/pen.*ubtitles/d' {} +
I did it for dozens of files in one command ;)
“find” searches all subdirectories below the current one (.) for every file with the srt extension (-name \*.srt) and executes the sed command that deletes on those files ({} +) the lines matching the regex pattern (pen.*ubtitles).
bytebin 