Linear walk of git history

linear-git-history.sh

#!/bin/bash
#Example usage: linear-git-history.sh HEAD FETCH_HEAD

prev_commit=$1
end_commit=$2
git log --pretty=format:"%h%n" --ancestry-path --reverse $prev_commit..$end_commit | while read commit; do
    if [ -n "$commit" ]; then

        #We need to make sure the commit is a direct child of the previous commit.
        is_direct_child=$(git show -s --pretty=format:"%P" $commit | grep $prev_commit)
                
        if [ ! -z "$is_direct_child" ] ; then
            echo "$commit"
        else
            echo "The commit is not a direct decendant of $prev_commit"
        fi

        prev_commit=$commit
    fi
done