Welcome to Shell Expert Pro

#!/bin/bash

# Backup and Restore Script
# Usage:
#   To backup: ./script.sh --source [source_dir] --destination [destination_dir] --backup
#   To restore: ./script.sh --source [source_dir] --destination [destination_dir] --restore

main() {
    parse_arguments "$@"

    if [[ $BACKUP -eq 1 ]]; then
        backup_files
    elif [[ $RESTORE -eq 1 ]]; then
        confirm_restore && restore_files
    else
        printf "Invalid operation. Please specify either --backup or --restore.\n" >&2
        return 1
    fi
}

parse_arguments() {
    while [[ $# -gt 0 ]]; do
        case "$1" in
            --source)
                SOURCE_DIR="$2"
                shift 2
                ;;
            --destination)
                DESTINATION_DIR="$2"
                shift 2
                ;;
            --backup)
                BACKUP=1
                shift
                ;;
            --restore)
                RESTORE=1
                shift
                ;;
            *)
                printf "Invalid argument: $1\n" >&2
                return 1
                ;;
        esac
    done

    if [[ -z $SOURCE_DIR || -z $DESTINATION_DIR ]]; then
        printf "Both source and destination directories are required.\n" >&2
        return 1
    fi
}

backup_files() {
    if ! mkdir -p "$DESTINATION_DIR"; then
        printf "Failed to create destination directory.\n" >&2
        return 1
    fi

    if ! tar -czf "${DESTINATION_DIR}/backup.tar.gz" -C "$SOURCE_DIR" .; then
        printf "Backup failed.\n" >&2
        return 1
    fi

    printf "Backup completed successfully.\n"
}

confirm_restore() {
    read -p "Are you sure you want to restore files to ${SOURCE_DIR}? [y/N] " confirmation
    [[ $confirmation == [Yy]* ]]
}

restore_files() {
    if ! tar -xzf "${DESTINATION_DIR}/backup.tar.gz" -C "$SOURCE_DIR"; then
        printf "Restore failed.\n" >&2
        return 1
    fi

    printf "Restore completed successfully.\n"
}

main "$@"