lzop_readme.txt

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    -S *.suf*, --suffix=*.suf*
        Use suffix *.suf* instead of *.lzo*. The suffix must not contain
        multiple dots and special characters like '+' or '*', and suffixes
        other than *.lzo* should be avoided to avoid confusion when files
        are transferred to other systems.

    -k, --keep
        Do not delete input files. This is the default.

    -U, --unlink, --delete
        Delete input files after succesfull compression or decompression.
        Use this option to make lzop behave like gzip and bzip2. Note that
        explicitly giving -k overrides -U.

    --crc32
        Use a crc32 checksum instead of a adler32 checksum.

    --no-warn
        Suppress all warnings.

    --ignore-warn
        Suppress all warnings, and never exit with exit status 2.

    -q, --quiet, --silent
        Suppress all warnings and decrease the verbosity of some commands
        like --list or --test.

    -v, --verbose
        Verbose. Display the name for each file compressed or decompressed.
        Multiple -v can be used to increase the verbosity of some commands
        like --list or --test.

    --  Specifies that this is the end of the options. Any file name after
        -- will not be interpreted as an option even if it starts with a
        hyphen.

OTHER OPTIONS
    --no-stdin
        Do not try to read standard input (but a file name "-" will still
        override this option). In old versions of lzop, this option was
        necessary when used in cron jobs (which do not have a controlling
        terminal).

    --filter=*NUMBER*
        Rarely useful. Preprocess data with a special "multimedia" filter
        before compressing in order to improve compression ratio. *NUMBER*
        must be a decimal number from 1 to 16, inclusive. Using a filter
        slows down both compression and decompression quite a bit, and the
        compression ratio usually doesn't improve much either... More
        effective filters may be added in the future, though.

        You can try --filter=1 with data like 8-bit sound samples,
        --filter=2 with 16-bit samples or depth-16 images, etc.

        Un-filtering during decompression is handled automatically.

    -C, --checksum
        Deprecated. Only for compatibility with very old versions as lzop
        now uses a checksum by default. This option will get removed in a
        future release.

    --no-color
        Do not use any color escape sequences.

    --mono
        Assume a mono ANSI terminal. This is the default under UNIX (if
        console support is compiled in).

    --color
        Assume a color ANSI terminal or try full-screen access. This is the
        default under DOS and in a Linux virtual console (if console support
        is compiled in).

ADVANCED USAGE
    lzop allows you to deal with your files in many flexible ways. Here are
    some usage examples:

    backup mode
       tar --use-compress-program=lzop -cf archive.tar.lzo files..

       This is the recommended mode for creating (possibly huge) backups.
       Requires GNU tar or a compatible version which accpets the
       `--use-compress-program=XXX' option.

    single file mode: individually (de)compress each file
      create
        lzop a.c             -> create a.c.lzo
        lzop a.c b.c         -> create a.c.lzo & b.c.lzo
        lzop -U a.c b.c      -> create a.c.lzo & b.c.lzo and delete a.c & b.c
        lzop *.c

      extract
        lzop -d a.c.lzo      -> restore a.c
        lzop -df a.c.lzo     -> restore a.c, overwrite if already exists
        lzop -d *.lzo

      list
        lzop -l a.c.lzo
        lzop -l *.lzo
        lzop -lv *.lzo       -> be verbose

      test
        lzop -t a.c.lzo
        lzop -tq *.lzo       -> be quiet

    pipe mode: (de)compress from stdin to stdout
      create
        lzop < a.c > y.lzo
        cat a.c | lzop > y.lzo
        tar -cf - *.c | lzop > y.tar.lzo     -> create a compressed tar file

      extract
        lzop -d < y.lzo > a.c
        lzop -d < y.tar.lzo | tar -xvf -     -> extract a tar file
        lzop -d < y.tar.lzo | tar -tvf -     -> list a tar file

      list
        lzop -l < y.lzo
        cat y.lzo | lzop -l

      test
        lzop -t < y.lzo
        cat y.lzo | lzop -t

    stdout mode: (de)compress to stdout
      create
        lzop -c a.c > y.lzo

      extract
        lzop -dc y.lzo > a.c
        lzop -dc y.tar.lzo | tar -tvf -      -> list a tar file

    archive mode: compress/extract multiple files into a single archive file
      create
        lzop a.c b.c -o sources.lzo          -> create an archive
        lzop -P src/*.c -o sources.lzo       -> create an archive, store path name
        lzop -c *.c > sources.lzo            -> another way to create an archive
        lzop -c *.h >> sources.lzo           -> add files to archive

      extract
        lzop -dN sources.lzo
        lzop -x ../src/sources.lzo           -> extract to current directory
        lzop -x -p/tmp < ../src/sources.lzo  -> extract to /tmp directory

      list
        lzop -lNv sources.lzo

      test
        lzop -t sources.lzo
        lzop -tvv sources.lzo                -> be very verbose

    If you wish to create a single archive file with multiple members so
    that members can later be extracted independently, you should prefer a
    full-featured archiver such as tar. The latest version of GNU tar
    supports the --use-compress-program=lzop option to invoke lzop
    transparently. lzop is designed as a complement to tar, not as a
    replacement.

ENVIRONMENT
    The environment variable LZOP can hold a set of default options for
    lzop. These options are interpreted first and can be overwritten by
    explicit command line parameters. For example:

        for sh/ksh/zsh:    LZOP="-1v --name"; export LZOP
        for csh/tcsh:      setenv LZOP "-1v --name"
        for DOS:           set LZOP=-1v --name

    On Vax/VMS, the name of the environment variable is LZOP_OPT, to avoid a
    conflict with the symbol set for invocation of the program.

    Not all of the options are valid in the environment variable - lzop will
    tell you.

SEE ALSO
    bzip2(1), gzip(1), tar(1)

    Precompiled binaries for some platforms are available from the lzop home
    page.

        see http://www.oberhumer.com/opensource/lzop/

    lzop uses the LZO data compression library for compression services.

        see http://www.oberhumer.com/opensource/lzo/

DIAGNOSTICS
    Exit status is normally 0; if an error occurs, exit status is 1. If a
    warning occurs, exit status is 2 (unless option --ignore-warn is
    effect).

    lzop's diagnostics are intended to be self-explanatory.

BUGS
    Please report all problems immediately to the author.

AUTHOR
    Markus Franz Xaver Johannes Oberhumer <[e-mail]>
    http://www.oberhumer.com/opensource/lzop/

COPYRIGHT
    lzop and the LZO library are Copyright (C) 1996, 1997, 1998, 1999, 2000,
    2001, 2002, 2003 by Markus Franz Xaver Johannes Oberhumer.

    lzop and the LZO library are distributed under the terms of the GNU
    General Public License (GPL).

    Legal info: If want to integrate lzop into your commercial
    (backup-)system please check the GNU GPL FAQ at
    http://www.gnu.org/licenses/gpl-faq.html about possible implications.