Git
Search
To search through all commits for a string:
git log -S "the string you want" -n 1 --pretty=format:%H
Regex Guide
To replace all occurrences of **WHATEVER**:
search pattern: \*\*(.+?)\*\*
replacement: [b $1]
Compress video files
ffmpeg -i eqno-scroll.mov -vcodec h264 -crf 23 output.mp4