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 current branch.
#


currentbranch=$(git branch --show-current)

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 $currentbranch

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