Merge "Fix bu command's showUsage() help text" into main

    }

    private static void showUsage() {

        System.err.println(" backup [-user USER_ID] [-f FILE] [-apk|-noapk] [-obb|-noobb] [-shared|-noshared]");

        System.err.println("        [-all] [-system|-nosystem] [-keyvalue|-nokeyvalue] [PACKAGE...]");

        System.err.println("     write an archive of the device's data to FILE [default=backup.adb]");

        System.err.println("     package list optional if -all/-shared are supplied");

        System.err.println("     -user: user ID for which to perform the operation (default - system user)");

        System.err.println("     -apk/-noapk: do/don't back up .apk files (default -noapk)");

        System.err.println("     -obb/-noobb: do/don't back up .obb files (default -noobb)");

        System.err.println("     -shared|-noshared: do/don't back up shared storage (default -noshared)");

        System.err.println("     -all: back up all installed applications");

        System.err.println("     -system|-nosystem: include system apps in -all (default -system)");

        System.err.println("     -keyvalue|-nokeyvalue: include apps that perform key/value backups.");

        System.err.println("         (default -nokeyvalue)");

        System.err.println(" restore [-user USER_ID] FILE       restore device contents from FILE");

        System.err.println("     -user: user ID for which to perform the operation (default - system user)");

        System.err.println("""

        Usage: bu <command> [options]

        Commands:

          backup [-user USER_ID] [-apk|-noapk] [-obb|-noobb] [-shared|-noshared]

                 [-all] [-system|-nosystem] [-widgets|-nowidgets]

                 [-compress|-nocompress] [-keyvalue|-nokeyvalue] [PACKAGE...]

            Write an archive of the device's data to stdout.

            The package list is optional if -all or -shared is supplied.

            Example: bu backup -all -apk > backup.ab

          restore [-user USER_ID]

            Restore device contents from stdin.

            Example: bu restore < backup.ab

        Global options:

          -user USER_ID: user ID for which to perform the operation (default - system user)

        Options for 'backup':

          -apk/-noapk: do/don't back up .apk files (default -noapk)

          -obb/-noobb: do/don't back up .obb files (default -noobb)

          -shared|-noshared: do/don't back up shared storage (default -noshared)

          -all: back up all installed applications

          -system|-nosystem: include system apps in -all (default -system)

          -widgets|-nowidgets: do/don't back up widget data (default: -nowidgets)

          -compress|-nocompress: enable/disable compression of the backup data (default: -compress)

          -keyvalue|-nokeyvalue: do/don't back up apps that are key/value based

                                 (default: -nokeyvalue)

        'restore' command does not take any package names or options other than -user.

                """);

    }

    private String nextArg() {