How to get parent of specific commit in Git?

Question

I have commit number. I would like to get previous commit number(parent). I need commits from current branch.

Answer 1

If you only want the ids of the parents of an input commit with id then run this command:

git cat-file -p  | awk 'NR > 1 {if(/^parent/){print $2; next}{exit}}'

This will work for normal and shallow clones.