Bash script for managing local save files

localsave.sh

#!/bin/bash
saveFile=~/.localsave.cfg
usage="
A small script that backs up save files to a directory, and update the local copies with the latest version.

Configuration is handled via file at $saveFile and the format is:

    localsave_dir=/path/to/back/saves/up/in
    GAME1=/path/to/savefiles/for/game1
    GAME2=/path/to/savefiles/for/game2
    ...

Usage:
    ./localsave.sh                 ( backs up all games in cfg file )
    ./localsave.sh GAME1           ( backs up just GAME1 )
    ./localsave.sh GAME1 /backups/ ( backs up just GAME1 to /backups instead of value in cfg file )

"

if [[ $1 == "help" || $1 == "--help" || $1 == "?" ]]; then
    printf "$usage"
    exit 0
fi

if [ ! -f $saveFile ]; then
    echo "No savefile configured"
    exit 1
fi

if [[ -z "$1" ]]; then
    for game in $(grep -v localsave_dir= $saveFile | cut -d = -f 1); do
        if [[ ! -z "$game" ]]; then
            bash "${BASH_SOURCE[0]}" $game
            echo ""
            echo "==========="
            echo ""
        fi
    done
    exit 0
fi

echo "Game: $1"
localFiles=$(grep "$1=" $saveFile | cut -d = -f 2)

if [[ -z "$localFiles" ]]; then
    echo "No config for game detected"
    exit 1
fi

echo "Local saves location: $localFiles"

if [ ! -d "$localFiles" ]; then
    echo "Local save dir doesn't exist"
    exit 1
fi

localMTime=0
if [[ -z $(ls "$localFiles") ]]; then
    echo "No local saves detected"
else
    localMTime=$(stat -c %Y "$localFiles")
fi

backupDir=$(grep "localsave_dir=" $saveFile | cut -d = -f 2)
if [[ ! -z "$2" ]]; then
    backupDir=$2
fi
echo "Backup dir: $backupDir"

if [ ! -d "$backupDir" ]; then
    echo "Backup dir doesn't exist"
    exit 1
fi

backupMTime=0
if [[ -z $(ls "$backupDir") ]]; then
    echo "No backup savefiles detected"
else
    latestBackup=$backupDir/$1/$(ls "$backupDir/$1" | grep -E '[0-9]+-.+' | tail -n 1)
    echo "Latest backup detected: $latestBackup"
    backupMTime=$(stat -c %Y "$latestBackup")
fi

echo "Local MTime: $localMTime"
echo "Backup MTime: $backupMTime"

tmpBackup="$backupDir/$1/$localMTime-$(hostname)/"
echo "Backing up local files to $tmpBackup"
mkdir -p "$tmpBackup"
cp -r "$localFiles/." "$tmpBackup/"

if [[ $backupMTime -gt $localMTime ]]; then
    echo "Backup MTime is greater than local MTime. Pulling..."
    cp -r "$latestBackup/." "$localFiles/"
fi