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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +lzop \- compress or expand files +.SH "ABSTRACT" +.IX Header "ABSTRACT" +\&\fBlzop\fR is a file compressor very similar to \fBgzip\fR. +\&\fBlzop\fR favors speed over compression ratio. +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +\&\fBlzop\fR [\ \fIcommand\fR\ ] [\ \fIoptions\fR\ ] [\ \fIfilename\fR\ ...\ \ ] +.PP +\&\fBlzop\fR [\fB\-dxlthIVL19\fR] [\fB\-qvcfFnNPkU\fR] +[\fB\-o\fR\ \fIfile\fR] [\fB\-p\fR[\fIpath\fR]] [\fB\-S\fR\ \fIsuffix\fR] +[\fIfilename\fR\ ...] +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fBlzop\fR reduces the size of the named files. Whenever possible, +each file is compressed into one with the extension +\&\fB.lzo\fR, while keeping the same ownership modes, access and +modification times. If no files are specified, or if a +file name is \*(L"\-\*(R", lzop tries to compress the standard +input to the standard output. lzop will only attempt to +compress regular files or symbolic links to regular files. +In particular, it will ignore directories. +.PP +If the compressed file name is too long for its file system, +\&\fBlzop\fR truncates it. +.PP +Compressed files can be restored to their original form +using \fBlzop\ \-d\fR. +\&\fBlzop\ \-d\fR takes a list of files on its command line and +decompresses each file whose name ends with \fB.lzo\fR and which +begins with the correct magic number to an uncompressed +file without the original extension. \fBlzop\ \-d\fR also recognizes +the special extension \fB.tzo\fR as shorthand for \fB.tar.lzo\fR. +When compressing, lzop uses the \fB.tzo\fR extension if necessary +instead of truncating a file with a \fB.tar\fR extension. +.PP +\&\fBlzop\fR stores the original file name, mode and time stamp +in the compressed file. These can be used when +decompressing the file with the \fB\-d\fR option. This is useful when +the compressed file name was truncated or when the time +stamp was not preserved after a file transfer. +.PP +\&\fBlzop\fR preserves the ownership, mode and time stamp of files +when compressing. When decompressing lzop restores the +mode and time stamp if present in the compressed files. +See the options \fB\-n\fR, \fB\-N\fR, \fB\-\-no\-mode\fR and \fB\-\-no\-time\fR +for more information. +.PP +\&\fBlzop\fR always keeps original files unchanged unless +you use the option \fB\-U\fR. +.PP +\&\fBlzop\fR uses the \fI\s-1LZO\s0 data compression library\fR for compression +services. The amount of compression obtained depends on +the size of the input and the distribution of common substrings. +Typically, text such as source code or English +is compressed into 40\-50% of the original size, and large files usually +compress much better than small ones. Compression and decompression speed +is generally much faster than that achieved by \fBgzip\fR, but +compression ratio is worse. +.SS "\s-1COMPRESSION\s0 \s-1LEVELS\s0" +.IX Subsection "COMPRESSION LEVELS" +lzop offers the following compression levels of the +\&\s-1LZO1X\s0 algorithm: +.IP "\-3" 4 +.IX Item "-3" +the default level offers pretty fast compression. +\&\-2, \-3, \-4, \-5 and \-6 are currently all equivalent \- this +may change in a future release. +.IP "\-1, \-\-fast" 4 +.IX Item "-1, --fast" +can be even a little bit faster in some cases \- but +most times you won't notice the difference +.IP "\-7, \-8, \-9, \-\-best" 4 +.IX Item "-7, -8, -9, --best" +these compression levels are mainly intended for generating +pre-compressed data \- especially \fB\-9\fR can be somewhat slow +.PP +Decompression is \fIvery\fR fast for all compression levels, +and decompression speed is not affected by the compression +level. +.SH "MAIN COMMAND" +.IX Header "MAIN COMMAND" +If no other command is given then lzop defaults to compression +(using compression level \-3). +.IP "\-#, \-\-fast, \-\-best" 4 +.IX Item "-#, --fast, --best" +Regulate the speed of compression using the specified +digit \fB#\fR, where \-1 or \-\-fast indicates the +fastest compression method (less compression) and +\&\-9 or \-\-best indicates the slowest compression +method (best compression). The default compression +level is \-3. +.IP "\-d, \-\-decompress, \-\-uncompress" 4 +.IX Item "-d, --decompress, --uncompress" +Decompress. Each file will be placed into +same the directory as the compressed file. +.IP "\-x, \-\-extract" 4 +.IX Item "-x, --extract" +Extract compressed files to the current working +directory. This is the same as '\-dPp'. +.IP "\-t, \-\-test" 4 +.IX Item "-t, --test" +Test. Check the compressed file integrity. +.IP "\-l, \-\-list" 4 +.IX Item "-l, --list" +For each compressed file, list the following +fields: +.Sp +.Vb 5 +\& method: compression method +\& compressed: size of the compressed file +\& uncompr.: size of the uncompressed file +\& ratio: compression ratio +\& uncompressed_name: name of the uncompressed file +.Ve +.Sp +In combination with the \-\-verbose option, the following +fields are also displayed: +.Sp +.Vb 1 +\& date & time: time stamp for the uncompressed file +.Ve +.Sp +With \-\-name, the uncompressed name, date and time +are those stored within the compress file if present. +.Sp +With \-\-verbose, the size totals and compression +ratio for all files is also displayed. With +\&\-\-quiet, the title and totals lines are not displayed. +.Sp +Note that lzop defines compression ratio +as compressed_size / uncompressed_size. +.IP "\-\-ls, \-\-ls=\fI\s-1FLAGS\s0\fR" 4 +.IX Item "--ls, --ls=FLAGS" +List each compressed file in a format similar to \fBls\ \-ln\fR. +.Sp +The following flags are currently honoured: + F Append a '*' for executable files. + G Inhibit display of group information. + Q Enclose file names in double quotes. +.IP "\-\-info" 4 +.IX Item "--info" +For each compressed file, list the internal header fields. +.IP "\-I, \-\-sysinfo" 4 +.IX Item "-I, --sysinfo" +Display information about the system and quit. +.IP "\-L, \-\-license" 4 +.IX Item "-L, --license" +Display the lzop license and quit. +.IP "\-h, \-H, \-\-help" 4 +.IX Item "-h, -H, --help" +Display a help screen and quit. +.IP "\-V" 4 +.IX Item "-V" +Version. Display the version number and compilation +options and quit. +.IP "\-\-version" 4 +.IX Item "--version" +Version. Display the version number and quit. +.SH "OPTIONS" +.IX Header "OPTIONS" +.IP "\-c, \-\-stdout, \-\-to\-stdout" 4 +.IX Item "-c, --stdout, --to-stdout" +Write output on standard output. If there are several +input files, the output consists of a sequence +of independently (de)compressed members. To obtain +better compression, concatenate all input files +before compressing them. +.IP "\-o \fI\s-1FILE\s0\fR, \-\-output=\fI\s-1FILE\s0\fR" 4 +.IX Item "-o FILE, --output=FILE" +Write output to the file \fI\s-1FILE\s0\fR. If there are several +input files, the output consists of a sequence +of independently (de)compressed members. +.IP "\-p, \-p\fI\s-1DIR\s0\fR, \-\-path=\fI\s-1DIR\s0\fR" 4 +.IX Item "-p, -pDIR, --path=DIR" +Write output files into the directory \fI\s-1DIR\s0\fR instead +of the directory determined by the input file. If +\&\fI\s-1DIR\s0\fR is omitted, then write to the current working +directory. +.IP "\-f, \-\-force" 4 +.IX Item "-f, --force" +Force lzop to +.Sp +.Vb 4 +\& \- overwrite existing files +\& \- (de\-)compress from stdin even if it seems a terminal +\& \- (de\-)compress to stdout even if it seems a terminal +\& \- allow option \-c in combination with \-U +.Ve +.Sp +Using \fB\-f\fR two or more times forces things like +.Sp +.Vb 3 +\& \- compress files that already have a .lzo suffix +\& \- try to decompress files that do not have a valid suffix +\& \- try to handle compressed files with unknown header flags +.Ve +.Sp +Use with care. +.IP "\-F, \-\-no\-checksum" 4 +.IX Item "-F, --no-checksum" +Do not store or verify a checksum of the uncompressed +file when compressing or decompressing. +This speeds up the operation of lzop a little bit (especially +when decompressing), but as unnoticed data corruption can happen +in case of damaged compressed files the usage of this option +is not generally recommended. +Also, a checksum is always stored when +compressing with one of the slow compression levels (\-7, \-8 or \-9), +regardless of this option. +.IP "\-n, \-\-no\-name" 4 +.IX Item "-n, --no-name" +When decompressing, do not restore the original +file name if present (remove only the lzop suffix +from the compressed file name). This option is the +default under \s-1UNIX\s0. +.IP "\-N, \-\-name" 4 +.IX Item "-N, --name" +When decompressing, restore the original file name +if present. This option is useful on systems which +have a limit on file name length. If the original name saved in +the compressed file is not suitable for its file system, a +new name is constructed from the original one to make it +legal. +This option is the default under \s-1DOS\s0, Windows and \s-1OS/2\s0. +.IP "\-P" 4 +.IX Item "-P" +When decompressing, restore the original path and file name if present. +When compressing, store the relative (and cleaned) path name. +This option is mainly useful when using \fBarchive mode\fR \- see +usage examples below. +.IP "\-\-no\-mode" 4 +.IX Item "--no-mode" +When decompressing, do not restore the original +mode (permissions) saved in the compressed file. +.IP "\-\-no\-time" 4 +.IX Item "--no-time" +When decompressing, do not restore the original +time stamp saved in the compressed file. +.IP "\-S \fI.suf\fR, \-\-suffix=\fI.suf\fR" 4 +.IX Item "-S .suf, --suffix=.suf" +Use suffix \fI.suf\fR instead of \fI.lzo\fR. The suffix must +not contain multiple dots and special characters like '+' or '*', +and suffixes other than \fI.lzo\fR should be avoided to avoid confusion +when files are transferred to other systems. +.IP "\-k, \-\-keep" 4 +.IX Item "-k, --keep" +Do not delete input files. This is the default. +.IP "\-U, \-\-unlink, \-\-delete" 4 +.IX Item "-U, --unlink, --delete" +Delete input files after succesfull compression or +decompression. Use this option to make lzop behave +like \fBgzip\fR and \fBbzip2\fR. +Note that explicitly giving \fB\-k\fR overrides \fB\-U\fR. +.IP "\-\-crc32" 4 +.IX Item "--crc32" +Use a crc32 checksum instead of a adler32 checksum. +.IP "\-\-no\-warn" 4 +.IX Item "--no-warn" +Suppress all warnings. +.IP "\-\-ignore\-warn" 4 +.IX Item "--ignore-warn" +Suppress all warnings, and never exit with exit status 2. +.IP "\-q, \-\-quiet, \-\-silent" 4 +.IX Item "-q, --quiet, --silent" +Suppress all warnings and decrease the verbosity of some +commands like \fB\-\-list\fR or \fB\-\-test\fR. +.IP "\-v, \-\-verbose" 4 +.IX Item "-v, --verbose" +Verbose. Display the name for each file compressed +or decompressed. Multiple \fB\-v\fR can be used to increase +the verbosity of some commands like \fB\-\-list\fR or \fB\-\-test\fR. +.IP "\-\-" 4 +Specifies that this is the end of the options. Any file name +after \fB\-\-\fR will not be interpreted as an option even if +it starts with a hyphen. +.SH "OTHER OPTIONS" +.IX Header "OTHER OPTIONS" +.IP "\-\-no\-stdin" 4 +.IX Item "--no-stdin" +Do not try to read standard input (but a file name \*(L"\-\*(R" will +still override this option). +In old versions of \fBlzop\fR, this option was necessary when +used in cron jobs (which do not have a controlling terminal). +.IP "\-\-filter=\fI\s-1NUMBER\s0\fR" 4 +.IX Item "--filter=NUMBER" +Rarely useful. +Preprocess data with a special \*(L"multimedia\*(R" filter +before compressing in order to improve compression ratio. +\&\fI\s-1NUMBER\s0\fR 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. +.Sp +You can try \-\-filter=1 with data like 8\-bit sound samples, +\&\-\-filter=2 with 16\-bit samples or depth\-16 images, etc. +.Sp +Un-filtering during decompression is handled automatically. +.IP "\-C, \-\-checksum" 4 +.IX Item "-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. +.IP "\-\-no\-color" 4 +.IX Item "--no-color" +Do not use any color escape sequences. +.IP "\-\-mono" 4 +.IX Item "--mono" +Assume a mono \s-1ANSI\s0 terminal. This is the default under \s-1UNIX\s0 +(if console support is compiled in). +.IP "\-\-color" 4 +.IX Item "--color" +Assume a color \s-1ANSI\s0 terminal or try full-screen access. This +is the default under \s-1DOS\s0 and in a Linux virtual console +(if console support is compiled in). +.SH "ADVANCED USAGE" +.IX Header "ADVANCED USAGE" +lzop allows you to deal with your files in many flexible +ways. Here are some usage examples: +.IP "\fBbackup mode\fR" 1 +.IX Item "backup mode" +.Vb 1 +\& tar \-\-use\-compress\-program=lzop \-cf archive.tar.lzo files.. +\& +\& This is the recommended mode for creating backups. +\& Requires GNU tar or a compatible version which accepts the +\& \*(Aq\-\-use\-compress\-program=XXX\*(Aq option. +.Ve +.IP "\fBsingle file mode:\fR individually (de)compress each file" 1 +.IX Item "single file mode: individually (de)compress each file" +.Vb 5 +\& 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 +.Ve +.IP "\fBpipe mode:\fR (de)compress from stdin to stdout" 1 +.IX Item "pipe mode: (de)compress from stdin to stdout" +.Vb 4 +\& 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 +\& +\& list +\& lzop \-l < y.lzo +\& cat y.lzo | lzop \-l +\& lzop \-d < y.tar.lzo | tar \-tvf \- \-> list a tar file +\& +\& test +\& lzop \-t < y.lzo +\& cat y.lzo | lzop \-t +.Ve +.IP "\fBstdout mode:\fR (de)compress to stdout" 1 +.IX Item "stdout mode: (de)compress to stdout" +.Vb 2 +\& create +\& lzop \-c a.c > y.lzo +\& +\& extract +\& lzop \-dc y.lzo > a.c +\& lzop \-dc y.tar.lzo | tar \-xvf \- \-> extract a tar file +\& +\& list +\& lzop \-dc y.tar.lzo | tar \-tvf \- \-> list a tar file +.Ve +.IP "\fBarchive mode:\fR compress/extract multiple files into a single archive file" 1 +.IX Item "archive mode: compress/extract multiple files into a single archive file" +.Vb 5 +\& 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 +.Ve +.PP +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 \s-1GNU\s0 tar supports the +\&\fB\-\-use\-compress\-program=lzop\fR option to invoke lzop transparently. +lzop is designed as a complement to tar, not as +a replacement. +.SH "ENVIRONMENT" +.IX Header "ENVIRONMENT" +The environment variable \fB\s-1LZOP\s0\fR 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: +.PP +.Vb 3 +\& for sh/ksh/zsh: LZOP="\-1v \-\-name"; export LZOP +\& for csh/tcsh: setenv LZOP "\-1v \-\-name" +\& for DOS/Windows: set LZOP=\-1v \-\-name +.Ve +.PP +On Vax/VMS, the name of the environment variable is +\&\s-1LZOP_OPT\s0, to avoid a conflict with the symbol set for +invocation of the program. +.PP +Not all of the options are valid in the environment variable \- +lzop will tell you. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fBbzip2\fR(1), \fBgzip\fR(1), \fBtar\fR(1) +.PP +Precompiled binaries for some platforms are available +from the lzop home page. +.PP +.Vb 1 +\& see http://www.oberhumer.com/opensource/lzop/ +.Ve +.PP +lzop uses the \s-1LZO\s0 data compression library for compression +services. +.PP +.Vb 1 +\& see http://www.oberhumer.com/opensource/lzo/ +.Ve +.SH "DIAGNOSTICS" +.IX Header "DIAGNOSTICS" +Exit status is normally 0; if an error occurs, exit status +is 1. If a warning occurs, exit status is 2 (unless +option \fB\-\-ignore\-warn\fR is in effect). +.PP +\&\fBlzop's\fR diagnostics are intended to be self-explanatory. +.SH "BUGS" +.IX Header "BUGS" +No bugs are known. Please report all problems immediately to the author. +.SH "AUTHOR" +.IX Header "AUTHOR" +Markus Franz Xaver Johannes Oberhumer +<markus@oberhumer.com> +http://www.oberhumer.com/opensource/lzop/ +.SH "COPYRIGHT" +.IX Header "COPYRIGHT" +lzop and the \s-1LZO\s0 library are +Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, +2006, 2007, 2008, 2009, 2010 by Markus Franz Xaver Johannes Oberhumer. +All Rights Reserved. +.PP +lzop and the \s-1LZO\s0 library are distributed under the terms +of the \s-1GNU\s0 General Public License (\s-1GPL\s0). +.PP +Legal info: If want to integrate lzop into your commercial (backup\-)system +please carefully read the \s-1GNU\s0 \s-1GPL\s0 \s-1FAQ\s0 at http://www.gnu.org/licenses/gpl\-faq.html +about possible implications. |