Do git squash

gitSquash.sh

#!/bin/bash

function gitSquash() {	
	# Check if the current directory is in a Git repository.
	if [ "$(git rev-parse --is-inside-work-tree &>/dev/null; echo "${?}")" == '0' ]; then

		if [ "X" != "X$1" ]; then		
			MESSAGE=""
			if [ "X" != "X$2" ]; then
				MESSAGE=" -m \"$2\""	
			fi

			command="git reset --soft HEAD~$1"			
			$command

			command="git commit$MESSAGE"	
			$command
		else
			echo "Head is first argument"
		fi

	else
		echo "Current directory is NOT in a Git repository"
	fi
}
alias gitS=gitSquash