Bash script to make a backup of the android user data

backup_android.sh

#!/bin/bash

LOG_FILE=~/android_backup.log
DISOLVE_DIRECTORY=0
if [[ $BACKUP_SRC -eq "" ]]; then BACKUP_SRC=storage/self/primary; fi
if [[ $BACKUP_DST -eq "" ]]; then BACKUP_DST=$HOME/AndroidBackup; fi
IFS=$'\n'    # set the Internal Field Separator to newline for iterating over file and directory list output of ls

usage() { echo "Usage: $0 [-s <android-source-folder>] [-d <backup-directory-path>] [-m]\n\t-x " 1>&2; exit 1; }
stop() { echo "Exiting..."; echo "No backup made!!"; exit 0; }

while getopts ":s:d:" o; do
    case "${o}" in
        d)
            BACKUP_DST=${OPTARG}
            ;;
        m)
            DISOLVE_DIRECTORY=1
            ;;
        s)
            BACKUP_SRC=${OPTARG}
            ;;
        *)
            usage
            ;;
    esac
done
shift $((OPTIND-1))

if [[ ! -d "$BACKUP_DST" ]]; then
    echo -e "Backup directory does not exist\n";
    read -p "Do you want to create the folder? (yes/[No])" choice
    case "$choice" in
        [Yy][Ee][sS]|[Yy])
            mkdir "$BACKUP_DST" -p || exit 1
            ;;
        *)
            stop
            ;;
    esac
fi

if [[ "$(which adb)" == "" ]]; then echo -e "adb not found!!\nadb installation is required to work"; stop; fi

echo -e "\nBackup started on `date`\n=====================================================" >> $LOG_FILE

directory_list=( "$(adb shell ls "$BACKUP_SRC" -R 2>&1 | grep :$ | cut -f -1 -d ':')" )
directory_count=$(echo "${directory_list[@]}" | wc -l 2>>$LOG_FILE)

count=0
echo -e "$count/$directory_count copying '$dir'";

for dir in ${directory_list[@]}; do
    echo -ne "\r$count/$directory_count copying '$dir'";
    mkdir -p "$BACKUP_DST/$dir" || exit
    file_list=( "$(adb shell ls -p \"$dir\" | grep -v /$ 2>>$LOG_FILE)" );
    for file in ${file_list[@]}; do
        adb pull "$dir/$file" "$BACKUP_DST/$dir/$file" 2>>$LOG_FILE 1>>$LOG_FILE
    done
    echo -ne "\033[1K";
    (( count++ ));
    echo -ne "\r$count/$directory_count copying '$dir'";
done
echo -e "\ncompleted"