Ship script inspired by this blog: http://reinh.com/blog/2008/08/27/hack-and-and-ship.html

codecompletion.sh

_git_branches()
{
    local cur
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    CURRENT=`git branch | grep '^*' | awk '{print $2}'`
    local versions=$(git branch | grep -v $CURRENT)
    COMPREPLY=($(compgen -W "${versions}" $cur))
}
complete -F _git_branches ship

ship.sh

# SHIP
#!/bin/bash

#
# Do a check if you have uncommited changes
#
GIT_NOT_COMMITED=`git status | grep 'nothing to commit' | awk '{print $2}'`
if [ -z "$GIT_NOT_COMMITED" ]; then
	echo "Current branch has uncommited changes"	
	exit
fi

#
# Oy! Checking if the branch to ship to really exists
#
TO_SHIP_TO=$1
CURRENT=`git branch | grep '\*' | awk '{print $2}'`
if [ -z $TO_SHIP_TO ]; then
  echo "First argument has to be one of these branches:"
  git branch | grep -v $CURRENT
  exit 1
fi

#
# Checkout to the ship branch
#
STATUS=`git checkout $TO_SHIP_TO | awk '{print $1}'`
if [[ "${STATUS}" =~ error ]]; then
  echo "Something went terribly wrong! ${STATUS}"
  git checkout ${CURRENT}
  exit 1
fi

#
# Pull the latest from origin into ship-branch
#
echo "Pulling ${TO_SHIP_TO} from origin"
STATUS=`git pull | awk '{print $1}'`
if [[ "${STATUS}" =~ error ]]; then
  echo "Something went terribly wrong! ${STATUS}"
  git checkout ${CURRENT}
  exit 1
fi

#
# Merge into whatever youre shipping to wit --no-ff
#
echo "Merging ${CURRENT} into ${TO_SHIP_TO}"
STATUS=`git merge --no-ff ${CURRENT} | awk '{print $1}'`
if [[ "${STATUS}" =~ error ]]; then
  echo "Something went terribly wrong with the merge! ${STATUS}"
  exit 1
fi

#
# Pushing
#
GIT_NOT_COMMITED=`git status | grep 'nothing to commit' | awk '{print $2}'`
if [ -z "$GIT_NOT_COMMITED" ]; then
	echo "Current branch has uncommited changes"	
	exit
else
  echo "Pushing to origin ${TO_SHIP_TO}"	
  git push && \
  git checkout ${CURRENT}
fi

Codecompletion for usage in your .bashrc og .profile