convenient git show in bash

git_show_bash.sh

# allows user to git show by the number the commit appears in git log
# 1 is the first commit, 2 is the second, etc...
git_show() {
    re='^[0-9]+$'
    if ! [[ $1 =~ $re ]]; then
        return
    fi
    sha="$(git log -$1 --format="%H")"
    shaSplit=(${sha//\n/ })
    git show ${shaSplit[$(($1 - 1))]}
}