Amend the commit message of one specific git commit and rebase to apply the changes

git-amend

#!/bin/sh
# Amend the commit message one specific commit and rebase
# to apply the changes. Given the SHA hash or a reference
# of the commit to amend, it checkouts the commit, amends
# it interactively and rebases the repo history in master.
#
# This action is destructive to your repo's history and this
# should not be performed on a repo that has been shared with
# others, because it will force them to reset their history.
#
# Use at your own risk.
#
# Put the script in your path and invoke it this way:
# git amend <SHA>

if [[ ! -n $1 ]]; then
  echo "usage: git amend <SHA>\n"
  exit 1
fi

echo "Amending $1..."

git checkout $1 && git commit --amend && git rebase HEAD master

[[ $? -eq 0 ]] && echo Done!
[[ $? -ne 0 ]] && echo Error!