Usage:

ugrep-indexer [-0|...|-9] [-.] [-c|-d|-f] [-I] [-q] [-S] [-s] [-X] [-z] [PATH]

    Updates indexes incrementally unless option -f or --force is specified.

    When option -I or --ignore-binary is specified, binary files are ignored
    and not indexed.  Searching with ugrep --index still searches binary files
    unless ugrep option -I or --ignore-binary is specified also.

    Archives and compressed files are indexed when option -z or --decompress is
    specified.  Otherwise, archives and compressed files are indexed as binary
    files, or are ignored with option -I or --ignore-binary.

    To save a log file, specify option -v or --verbose and redirect standard
    output to a log file.  All messages are sent to standard output.

    A .ugrep-indexer configuration file with configuration options is loaded
    when present in the working directory or in the home directory.  A
    configuration option consists of the name of a long option and its argument
    when applicable.

    The following options are available:

    PATH    Optional pathname to the root of the directory tree to index.  The
            default is to recursively index the working directory tree.

    -0, -1, -2, -3, ..., -9, --accuracy=DIGIT
            Specifies indexing accuracy.  A low accuracy reduces the indexing
            storage overhead at the cost of a higher rate of false positive
            pattern matches (more noise).  A high accuracy reduces the rate of
            false positive regex pattern matches (less noise) at the cost of an
            increased indexing storage overhead.  An accuracy between 2 and 7
            is recommended.  The default accuracy is 4.
    -., --hidden
            Index hidden files and directories.
    -?, --help
            Display a help message and exit.
    -c, --check
            Recursively check and report indexes without reindexing files.
    -d, --delete
            Recursively remove index files.
    -f, --force
            Force reindexing of files, even those that are already indexed.
    -I, --ignore-binary
            Do not index binary files.
    -q, --quiet, --silent
            Quiet mode: do not display indexing statistics.
    -S, --dereference-files
            Follow symbolic links to files.  Symbolic links to directories are
            never followed.
    -s, --no-messages
            Silent mode: nonexistent and unreadable files are ignored, i.e.
            their error messages and warnings are suppressed.
    -V, --version
            Display version and exit.
    -v, --verbose
            Produce verbose output.  Files are marked A for archive, C for
            compressed, and B for binary or I for ignored binary.  Deletions
            are marked D.
    -X, --ignore-files, --ignore-files=FILE
            Do not index files and directories matching the globs in FILE
            encountered during indexing.  The default FILE is `.gitignore'.
            This option may be repeated to specify additional files.
    -z, --decompress
            Index the contents of compressed files and archives.  Hidden files
            in archives are ignored unless option -. or --hidden is specified.
            Option -I or --ignore-binary ignores compressed binary files.  When
            used with option --zmax=NUM, indexes the contents of compressed
            files and archives stored within archives up to NUM levels deep.
            Supported compression formats: gzip (.gz), compress (.Z), zip, 7z,
            bzip2 (requires suffix .bz, .bz2, .bzip2, .tbz, .tbz2, .tb2, .tz2),
            lzma and xz (requires suffix .lzma, .tlz, .xz, .txz),
            lz4 (requires suffix .lz4),
            zstd (requires suffix .zst, .zstd, .tzst),
            brotli (requires suffix .br).
    --zmax=NUM
            When used with option -z (--decompress), indexes the contents of
            compressed files and archives stored within archives by up to NUM
            expansion levels deep.  The default --zmax=1 only permits indexing
            uncompressed files stored in cpio, pax, tar, zip and 7z archives;
            compressed files and archives are detected as binary files and are
            effectively ignored.  Specify --zmax=2 to index compressed files
            and archives stored in cpio, pax, tar, zip and 7z archives.  NUM
            may range from 1 to 99 for up to 99 decompression and de-archiving
            steps.  Increasing NUM values gradually degrades performance.

    The ugrep-indexer utility exits with one of the following values:
    0      Indexes are up to date.
    1      Indexing check -c detected missing and outdated index files.