Bash script to determine if current branch need rebase changes from the integration branch.

check_rebase.sh

#!/bin/bash
# Bash script to determine if current branch(default HEAD)
# need rebase the changes from the integration
# branch(default master)
# Author:  Justin Zhang <fgz@qad.com>
# Created: 2013-12-04
#
# Usage:
#       check_rebase.sh [current branch] [integration branch]
#

trg=$1
itg=$2

if [[ -z $trg ]]; then
    trg=HEAD
fi
if [[ -z $itg ]]; then
    itg=master
fi

ret=$(git rev-list $trg..$itg)
if [[ -z $ret ]]; then
    echo "You have no need to rebase."
else
    echo "You need rebase to absorb the following changes:"
    for r in $ret
    do
        echo $r
    done
fi