gistfile1.sh

#!/bin/bash

commit=$(git rev-parse $1)
branch=$2
if [[ -z "$branch" ]]; then
    branch=HEAD
fi
 
while true; do
  commit=$(git rev-list --children $branch --not $commit^@ | \
      awk "/^$commit/ { print \$2 }")
  case $commit in
    *[a-z0-9]*) ;;
    *) break;
  esac
  author_name=$(git show --pretty=format:"%an" $commit | sed q)
  description=$(git log -n1 --pretty=medium $commit | sed '1,4d' | head -1 | cut -c 1-40 | sed 's/^ *//')
  printf "\033[01;34m$commit\033[00m \033[01;32m%-20s\033[00m %s\n" "$author_name" "$description"
done