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531
doc/zutils.info
View file

@ -1,5 +1,4 @@
This is zutils.info, produced by makeinfo version 4.13+ from
zutils.texi.
This is zutils.info, produced by makeinfo version 4.13+ from zutils.texi.
INFO-DIR-SECTION Data Compression
START-INFO-DIR-ENTRY
@ -12,7 +11,7 @@ File: zutils.info, Node: Top, Next: Introduction, Up: (dir)
Zutils Manual
*************
This manual is for Zutils (version 1.8, 1 January 2019).
This manual is for Zutils (version 1.9, 27 June 2020).
* Menu:
@ -29,10 +28,10 @@ This manual is for Zutils (version 1.8, 1 January 2019).
* Concept index:: Index of concepts
Copyright (C) 2009-2019 Antonio Diaz Diaz.
Copyright (C) 2009-2020 Antonio Diaz Diaz.
This manual is free documentation: you have unlimited permission to
copy, distribute and modify it.
This manual is free documentation: you have unlimited permission to copy,
distribute, and modify it.

File: zutils.info, Node: Introduction, Next: Common options, Prev: Top, Up: Top
@ -41,45 +40,45 @@ File: zutils.info, Node: Introduction, Next: Common options, Prev: Top, Up:
**************
Zutils is a collection of utilities able to process any combination of
compressed and uncompressed files transparently. If any given file,
including standard input, is compressed, its decompressed content is
used. Compressed files are decompressed on the fly; no temporary files
are created.
compressed and uncompressed files transparently. If any file given,
including standard input, is compressed, its decompressed content is used.
Compressed files are decompressed on the fly; no temporary files are
created.
These utilities are not wrapper scripts but safer and more efficient
C++ programs. In particular the '--recursive' option is very efficient
in those utilities supporting it.
These utilities are not wrapper scripts but safer and more efficient C++
programs. In particular the option '--recursive' is very efficient in those
utilities supporting it.
The utilities provided are zcat, zcmp, zdiff, zgrep, ztest and zupdate.
The formats supported are bzip2, gzip, lzip and xz.
Zutils uses external compressors. The compressor to be used for each
format is configurable at runtime.
The utilities provided are zcat, zcmp, zdiff, zgrep, ztest, and zupdate.
The formats supported are bzip2, gzip, lzip, and xz.
Zutils uses external compressors. The compressor to be used for each format
is configurable at runtime.
zcat, zcmp, zdiff, and zgrep are improved replacements for the shell
scripts provided by GNU gzip. ztest is unique to zutils. zupdate is
similar to gzip's znew.
scripts provided by GNU gzip. ztest is unique to zutils. zupdate is similar
to gzip's znew.
NOTE: Bzip2 and lzip provide well-defined values of exit status,
which makes them safe to use with zutils. Gzip and xz may return
ambiguous warning values, making them less reliable back ends for
zutils. *Note compressor-requirements::.
NOTE: Bzip2 and lzip provide well-defined values of exit status, which
makes them safe to use with zutils. Gzip and xz may return ambiguous warning
values, making them less reliable back ends for zutils. *Note
compressor-requirements::.
FORMAT NOTE 1: The '--format' option allows the processing of a
subset of formats in recursive mode and when trying compressed file
names: 'zgrep foo -r --format=bz2,lz somedir somefile.tar'.
FORMAT NOTE 1: The option '--format' allows the processing of a subset
of formats in recursive mode and when trying compressed file names:
'zgrep foo -r --format=bz2,lz somedir somefile.tar'.
FORMAT NOTE 2: If the '--force-format' option is given, the files
are passed to the corresponding decompressor without verifying their
format, allowing for example the processing of compress'd (.Z) files
with gzip: 'zcmp --force-format=gz file.Z file.lz'.
FORMAT NOTE 2: If the option '--force-format' is given, the files are
passed to the corresponding decompressor without verifying their format,
allowing for example the processing of compress'd (.Z) files with gzip:
'zcmp --force-format=gz file.Z file.lz'.
LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may
never have been compressed. Decompressed is used to refer to data which
have undergone the process of decompression.
LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never
have been compressed. Decompressed is used to refer to data which have
undergone the process of decompression.
Numbers given as arguments to options (positions, sizes) may be
followed by a multiplier and an optional 'B' for "byte".
Numbers given as arguments to options (positions, sizes) may be followed
by a multiplier and an optional 'B' for "byte".
Table of SI and binary prefixes (unit multipliers):
@ -99,9 +98,9 @@ File: zutils.info, Node: Common options, Next: The zutilsrc file, Prev: Intro
2 Common options
****************
The following options are available in all the utilities. Rather than
writing identical descriptions for each of the programs, they are
described here.
The following options: are available in all the utilities. Rather than
writing identical descriptions for each of the programs, they are described
here. *Note Argument syntax: (arg_parser)Argument syntax.
'-h'
'--help'
@ -110,19 +109,19 @@ described here.
'-V'
'--version'
Print the version number on the standard output and exit. This
version number should be included in all bug reports.
Print the version number on the standard output and exit. This version
number should be included in all bug reports.
'-M FORMAT_LIST'
'--format=FORMAT_LIST'
Process only the formats listed in the comma-separated
FORMAT_LIST. Valid formats are 'bz2', 'gz', 'lz', 'xz' and 'un'
for 'uncompressed', meaning "any file name without a known
extension". This option excludes files based on extension, instead
of format, because it is more efficient. The exclusion only
applies to names generated automatically (for example when adding
extensions to a file name or when operating recursively on
directories). Files given in the command line are always processed.
Process only the formats listed in the comma-separated FORMAT_LIST.
Valid formats are 'bz2', 'gz', 'lz', 'xz', and 'un' for
'uncompressed', meaning "any file name without a known extension".
This option excludes files based on extension, instead of format,
because it is more efficient. The exclusion only applies to names
generated automatically (for example when adding extensions to a file
name or when operating recursively on directories). Files given in the
command line are always processed.
Each format in FORMAT_LIST enables file names with the following
extensions:
@ -141,17 +140,20 @@ described here.
'--gz=COMMAND'
'--lz=COMMAND'
'--xz=COMMAND'
Set program (may include arguments) to be used as (de)compressor
for the given format. The name of the program can't begin with
'-'. These options override the values set in 'zutilsrc'. The
compression program used must meet three requirements:
Set program to be used as (de)compressor for the corresponding format.
COMMAND may include arguments. For example '--lz='plzip --threads=2''.
The program set with '--lz' is used for both compression and
decompression. The other three are used only for decompression. The
name of the program can't begin with '-'. These options override the
values set in 'zutilsrc'. The compression program used must meet three
requirements:
1. When called with the '-d' option, it must read compressed
data from the standard input and produce decompressed data on
the standard output.
1. When called with the option '-d', it must read compressed data
from the standard input and produce decompressed data on the
standard output.
2. If the '-q' option is passed to zutils, the compression
program must also accept it.
2. If the option '-q' is passed to zutils, the compression program
must also accept it.
3. It must return 0 if no errors occurred, and a non-zero value
otherwise.
@ -164,23 +166,23 @@ File: zutils.info, Node: The zutilsrc file, Next: Zcat, Prev: Common options,
*******************
'zutilsrc' is the runtime configuration file for zutils. In it you may
define the compressor name and options to be used for each format. The
'zutilsrc' file is optional; you don't need to install it in order to
run zutils.
define the compressor name and options to be used for each format. The
'zutilsrc' file is optional; you don't need to install it in order to run
zutils.
The compressors specified in the command line override those
specified in the 'zutilsrc' file.
The compressors specified in the command line override those specified
in the 'zutilsrc' file.
You may copy the system 'zutilsrc' file '${sysconfdir}/zutilsrc' to
'$HOME/.zutilsrc' and customize these options as you like. The file
syntax is fairly obvious (and there are further instructions in it):
'$HOME/.zutilsrc' and customize these options as you like. The file syntax
is fairly obvious (and there are further instructions in it):
1. Any line beginning with '#' is a comment line.
2. Each non-comment line defines the command to be used for the given
format, with the syntax:
2. Each non-comment line defines the command to be used for the
corresponding format, with the syntax:
<format> = <compressor> [options]
where <format> is one of 'bz2', 'gz', 'lz' or 'xz'.
where <format> is one of 'bz2', 'gz', 'lz', or 'xz'.

File: zutils.info, Node: Zcat, Next: Zcmp, Prev: The zutilsrc file, Up: Top
@ -188,26 +190,26 @@ File: zutils.info, Node: Zcat, Next: Zcmp, Prev: The zutilsrc file, Up: Top
4 Zcat
******
zcat copies each given file to standard output. If any given file is
compressed, its decompressed content is used. If a given file does not
exist, and its name does not end with one of the known extensions, zcat
tries the compressed file names corresponding to the formats supported.
If a file fails to decompress, zcat continues copying the rest of the
files.
zcat copies each FILE argument to standard output in sequence. If any file
given is compressed, its decompressed content is copied. If a file given
does not exist, and its name does not end with one of the known extensions,
zcat tries the compressed file names corresponding to the formats
supported. If a file fails to decompress, zcat continues copying the rest
of the files.
If a file is specified as '-', data are read from standard input,
decompressed if needed, and sent to standard output. Data read from
standard input must be of the same type; all uncompressed or all in the
same compression format.
same compressed format.
If no files are specified, recursive searches examine the current
working directory, and nonrecursive searches read standard input.
If no files are specified, recursive searches examine the current working
directory, and nonrecursive searches read standard input.
The format for running zcat is:
zcat [OPTIONS] [FILES]
Exit status is 0 if no errors occurred, non-zero otherwise.
Exit status is 0 if no errors occurred, 1 otherwise.
zcat supports the following options:
@ -217,8 +219,8 @@ Exit status is 0 if no errors occurred, non-zero otherwise.
'-b'
'--number-nonblank'
Number all nonblank output lines, starting with 1. The line count
is unlimited.
Number all nonblank output lines, starting with 1. The line count is
unlimited.
'-e'
Equivalent to '-vE'.
@ -229,16 +231,14 @@ Exit status is 0 if no errors occurred, non-zero otherwise.
'-n'
'--number'
Number all output lines, starting with 1. The line count is
unlimited.
Number all output lines, starting with 1. The line count is unlimited.
'-O FORMAT'
'--force-format=FORMAT'
Force the given compression format. Valid values for FORMAT are
'bz2', 'gz', 'lz' and 'xz'. If this option is used, the files are
passed to the corresponding decompressor without verifying their
format, and the exact file name must be given. Other names won't
be tried.
Force the compressed format given. Valid values for FORMAT are 'bz2',
'gz', 'lz', and 'xz'. If this option is used, the files are passed to
the corresponding decompressor without verifying their format, and the
exact file name must be given. Other names won't be tried.
'-q'
'--quiet'
@ -247,8 +247,8 @@ Exit status is 0 if no errors occurred, non-zero otherwise.
'-r'
'--recursive'
For each directory operand, read and process all files in that
directory, recursively. Follow symbolic links in the command line,
but skip symlinks that are encountered recursively.
directory, recursively. Follow symbolic links given in the command
line, but skip symbolic links that are encountered recursively.
'-R'
'--dereference-recursive'
@ -282,28 +282,27 @@ File: zutils.info, Node: Zcmp, Next: Zdiff, Prev: Zcat, Up: Top
5 Zcmp
******
zcmp compares two files ('-' means standard input), and if they differ,
tells the first byte and line number where they differ. Bytes and lines
are numbered starting with 1. If any given file is compressed, its
decompressed content is used. Compressed files are decompressed on the
fly; no temporary files are created.
zcmp compares two files and, if they differ, writes to standard output the
first byte and line number where they differ. Bytes and lines are numbered
starting with 1. A hyphen '-' used as a FILE argument means standard input.
If any file given is compressed, its decompressed content is used.
Compressed files are decompressed on the fly; no temporary files are
created.
The format for running zcmp is:
zcmp [OPTIONS] FILE1 [FILE2]
This compares FILE1 to FILE2. If FILE2 is omitted zcmp tries the
This compares FILE1 to FILE2. The standard input is used only if FILE1 or
FILE2 refers to standard input. If FILE2 is omitted zcmp tries the
following:
1. If FILE1 is compressed, compares its decompressed contents with
the corresponding uncompressed file (the name of FILE1 with the
extension removed).
- If FILE1 is compressed, compares its decompressed contents with the
corresponding uncompressed file (the name of FILE1 with the extension
removed).
2. If FILE1 is uncompressed, compares it with the decompressed
contents of FILE1.[lz|bz2|gz|xz] (the first one that is found).
3. If no suitable file is found, compares FILE1 with data read from
standard input.
- If FILE1 is uncompressed, compares it with the decompressed contents
of FILE1.[lz|bz2|gz|xz] (the first one that is found).
An exit status of 0 means no differences were found, 1 means some
differences were found, and 2 means trouble.
@ -312,17 +311,16 @@ differences were found, and 2 means trouble.
'-b'
'--print-bytes'
Print the differing bytes. Print control bytes as a '^' followed by
a letter, and precede bytes larger than 127 with 'M-' (which stands
for "meta").
Print the differing bytes. Print control bytes as a '^' followed by a
letter, and precede bytes larger than 127 with 'M-' (which stands for
"meta").
'-i SIZE'
'--ignore-initial=SIZE'
Ignore any differences in the first SIZE bytes of the input files.
Treat files with fewer than SIZE bytes as if they were empty. If
SIZE is in the form 'SIZE1:SIZE2', ignore the first SIZE1 bytes of
the first input file and the first SIZE2 bytes of the second input
file.
Treat files with fewer than SIZE bytes as if they were empty. If SIZE
is in the form 'SIZE1:SIZE2', ignore the first SIZE1 bytes of the
first input file and the first SIZE2 bytes of the second input file.
'-l'
'-v'
@ -337,20 +335,20 @@ differences were found, and 2 means trouble.
'-O [FORMAT1][,FORMAT2]'
'--force-format=[FORMAT1][,FORMAT2]'
Force the given compression formats. Any of FORMAT1 or FORMAT2 may
be omitted and the corresponding format will be automatically
detected. Valid values for FORMAT are 'bz2', 'gz', 'lz' and 'xz'.
If at least one format is specified with this option, the file is
passed to the corresponding decompressor without verifying its
format, and the exact file names of both FILE1 and FILE2 must be
given. Other names won't be tried.
Force the compressed formats given. Any of FORMAT1 or FORMAT2 may be
omitted and the corresponding format will be automatically detected.
Valid values for FORMAT are 'bz2', 'gz', 'lz', and 'xz'. If at least
one format is specified with this option, the file is passed to the
corresponding decompressor without verifying its format, and the exact
file names of both FILE1 and FILE2 must be given. Other names won't be
tried.
'-q'
'-s'
'--quiet'
'--silent'
Don't print anything; only return an exit status indicating
whether the files differ.
Don't print anything; only return an exit status indicating whether the
files differ.

@ -359,34 +357,33 @@ File: zutils.info, Node: Zdiff, Next: Zgrep, Prev: Zcmp, Up: Top
6 Zdiff
*******
zdiff compares two files ('-' means standard input), and if they
differ, shows the differences line by line. If any given file is
compressed, its decompressed content is used. zdiff is a front end to
the diff program and has the limitation that messages from diff refer to
temporary file names instead of those specified.
zdiff compares two files and, if they differ, writes to standard output the
differences line by line. A hyphen '-' used as a FILE argument means
standard input. If any file given is compressed, its decompressed content
is used. zdiff is a front end to the program diff and has the limitation
that messages from diff refer to temporary file names instead of those
specified.
The format for running zdiff is:
zdiff [OPTIONS] FILE1 [FILE2]
This compares FILE1 to FILE2. If FILE2 is omitted zdiff tries the
This compares FILE1 to FILE2. The standard input is used only if FILE1 or
FILE2 refers to standard input. If FILE2 is omitted zdiff tries the
following:
1. If FILE1 is compressed, compares its decompressed contents with
the corresponding uncompressed file (the name of FILE1 with the
extension removed).
- If FILE1 is compressed, compares its decompressed contents with the
corresponding uncompressed file (the name of FILE1 with the extension
removed).
2. If FILE1 is uncompressed, compares it with the decompressed
contents of FILE1.[lz|bz2|gz|xz] (the first one that is found).
3. If no suitable file is found, compares FILE1 with data read from
standard input.
- If FILE1 is uncompressed, compares it with the decompressed contents
of FILE1.[lz|bz2|gz|xz] (the first one that is found).
An exit status of 0 means no differences were found, 1 means some
differences were found, and 2 means trouble.
zdiff supports the following options (some options only work if the
diff program used supports them):
zdiff supports the following options (some options only work if the diff
program used supports them):
'-a'
'--text'
@ -421,13 +418,13 @@ diff program used supports them):
'-O [FORMAT1][,FORMAT2]'
'--force-format=[FORMAT1][,FORMAT2]'
Force the given compression formats. Any of FORMAT1 or FORMAT2 may
be omitted and the corresponding format will be automatically
detected. Valid values for FORMAT are 'bz2', 'gz', 'lz' and 'xz'.
If at least one format is specified with this option, the file is
passed to the corresponding decompressor without verifying its
format, and the exact file names of both FILE1 and FILE2 must be
given. Other names won't be tried.
Force the compressed formats given. Any of FORMAT1 or FORMAT2 may be
omitted and the corresponding format will be automatically detected.
Valid values for FORMAT are 'bz2', 'gz', 'lz', and 'xz'. If at least
one format is specified with this option, the file is passed to the
corresponding decompressor without verifying its format, and the exact
file names of both FILE1 and FILE2 must be given. Other names won't be
tried.
'-p'
'--show-c-function'
@ -467,31 +464,29 @@ File: zutils.info, Node: Zgrep, Next: Ztest, Prev: Zdiff, Up: Top
7 Zgrep
*******
zgrep is a front end to the grep program that allows transparent search
on any combination of compressed and uncompressed files. If any given
file is compressed, its decompressed content is used. If a given file
does not exist, and its name does not end with one of the known
extensions, zgrep tries the compressed file names corresponding to the
formats supported. If a file fails to decompress, zgrep continues
searching the rest of the files.
zgrep is a front end to the program grep that allows transparent search on
any combination of compressed and uncompressed files. If any file given is
compressed, its decompressed content is used. If a file given does not
exist, and its name does not end with one of the known extensions, zgrep
tries the compressed file names corresponding to the formats supported. If
a file fails to decompress, zgrep continues searching the rest of the files.
If a file is specified as '-', data are read from standard input,
decompressed if needed, and fed to grep. Data read from standard input
must be of the same type; all uncompressed or all in the same
compression format.
decompressed if needed, and fed to grep. Data read from standard input must
be of the same type; all uncompressed or all in the same compressed format.
If no files are specified, recursive searches examine the current
working directory, and nonrecursive searches read standard input.
If no files are specified, recursive searches examine the current working
directory, and nonrecursive searches read standard input.
The format for running zgrep is:
zgrep [OPTIONS] PATTERN [FILES]
An exit status of 0 means at least one match was found, 1 means no
matches were found, and 2 means trouble.
An exit status of 0 means at least one match was found, 1 means no matches
were found, and 2 means trouble.
zgrep supports the following options (some options only work if the
grep program used supports them):
zgrep supports the following options (some options only work if the grep
program used supports them):
'-a'
'--text'
@ -518,7 +513,7 @@ grep program used supports them):
Print N lines of output context.
'--color[=WHEN]'
Show matched strings in color. WHEN is 'never', 'always' or 'auto'.
Show matched strings in color. WHEN is 'never', 'always', or 'auto'.
'-e PATTERN'
'--regexp=PATTERN'
@ -531,9 +526,9 @@ grep program used supports them):
'-f FILE'
'--file=FILE'
Obtain patterns from FILE, one per line.
When searching in several files at once, command substitution can
be used with '-e' to read FILE only once, for example if FILE is
not a regular file: 'zgrep -e "$(cat FILE)" file1.lz file2.gz'
When searching in several files at once, command substitution can be
used with '-e' to read FILE only once, for example if FILE is not a
regular file: 'zgrep -e "$(cat FILE)" file1.lz file2.gz'
'-F'
'--fixed-strings'
@ -541,8 +536,8 @@ grep program used supports them):
'-h'
'--no-filename'
Suppress the prefixing of file names on output when multiple files
are searched.
Suppress the prefixing of file names on output when multiple files are
searched.
'-H'
'--with-filename'
@ -577,22 +572,21 @@ grep program used supports them):
'-O FORMAT'
'--force-format=FORMAT'
Force the given compression format. Valid values for FORMAT are
'bz2', 'gz', 'lz' and 'xz'. If this option is used, the files are
passed to the corresponding decompressor without verifying their
format, and the exact file name must be given. Other names won't
be tried.
Force the compressed format given. Valid values for FORMAT are 'bz2',
'gz', 'lz', and 'xz'. If this option is used, the files are passed to
the corresponding decompressor without verifying their format, and the
exact file name must be given. Other names won't be tried.
'-q'
'--quiet'
Suppress all messages. Exit immediately with zero status if any
match is found, even if an error was detected.
Suppress all messages. Exit immediately with zero status if any match
is found, even if an error was detected.
'-r'
'--recursive'
For each directory operand, read and process all files in that
directory, recursively. Follow symbolic links in the command line,
but skip symlinks that are encountered recursively.
directory, recursively. Follow symbolic links given in the command
line, but skip symbolic links that are encountered recursively.
'-R'
'--dereference-recursive'
@ -625,42 +619,43 @@ File: zutils.info, Node: Ztest, Next: Zupdate, Prev: Zgrep, Up: Top
8 Ztest
*******
ztest verifies the integrity of the specified compressed files.
ztest verifies the integrity of the compressed files specified.
Uncompressed files are ignored. If a file is specified as '-', the
integrity of compressed data read from standard input is verified. Data
read from standard input must be all in the same compression format. If
a file fails to decompress, ztest continues verifying the rest of the
files.
read from standard input must be all in the same compressed format. If a
file fails to decompress, does not exist, can't be opened, or is a
terminal, ztest continues verifying the rest of the files. A final
diagnostic is shown at verbosity level 1 or higher if any file fails the
test when testing multiple files.
If no files are specified, recursive searches examine the current
working directory, and nonrecursive searches read standard input.
If no files are specified, recursive searches examine the current working
directory, and nonrecursive searches read standard input.
Note that error detection in the xz format is broken. First, some xz
files lack integrity information. Second, not all xz decompressors can
verify the integrity of all xz files. Third, section 2.1.1.2 'Stream
Flags' of the xz format specification allows xz decompressors to
produce garbage output without issuing any warning. Therefore, xz files
can't always be verified as reliably as files in the other formats can.
verify the integrity of all xz files. Third, section 2.1.1.2 'Stream Flags'
of the xz format specification allows xz decompressors to produce garbage
output without issuing any warning. Therefore, xz files can't always be
verified as reliably as files in the other formats can.
The format for running ztest is:
ztest [OPTIONS] [FILES]
The exit status is 0 if all compressed files verify OK, 1 if
environmental problems (file not found, invalid flags, I/O errors, etc),
2 if any compressed file is corrupt or invalid.
The exit status is 0 if all compressed files verify OK, 1 if environmental
problems (file not found, invalid flags, I/O errors, etc), 2 if any
compressed file is corrupt or invalid.
ztest supports the following options:
'-O FORMAT'
'--force-format=FORMAT'
Force the given compression format. Valid values for FORMAT are
'bz2', 'gz', 'lz' and 'xz'. If this option is used, the files are
passed to the corresponding decompressor without verifying their
format, and any files in a format that the decompressor can't
understand will fail. For example, '--force-format=gz' can test
gzipped (.gz) and compress'd (.Z) files if the compressor used is
GNU gzip.
Force the compressed format given. Valid values for FORMAT are 'bz2',
'gz', 'lz', and 'xz'. If this option is used, the files are passed to
the corresponding decompressor without verifying their format, and any
files in a format that the decompressor can't understand will fail.
For example, '--force-format=gz' can test gzipped (.gz) and compress'd
(.Z) files if the compressor used is GNU gzip.
'-q'
'--quiet'
@ -669,8 +664,8 @@ environmental problems (file not found, invalid flags, I/O errors, etc),
'-r'
'--recursive'
For each directory operand, read and process all files in that
directory, recursively. Follow symbolic links in the command line,
but skip symlinks that are encountered recursively.
directory, recursively. Follow symbolic links given in the command
line, but skip symbolic links that are encountered recursively.
'-R'
'--dereference-recursive'
@ -689,68 +684,69 @@ File: zutils.info, Node: Zupdate, Next: Problems, Prev: Ztest, Up: Top
9 Zupdate
*********
zupdate recompresses files from bzip2, gzip, and xz formats to lzip
format. Each original is compared with the new file and then deleted.
Only regular files with standard file name extensions are recompressed,
other files are ignored. Compressed files are decompressed and then
recompressed on the fly; no temporary files are created. If an error
happens while recompressing a file, zupdate exits immediately without
recompressing the rest of the files. The lzip format is chosen as
destination because it is the most appropriate for long-term data
archiving.
zupdate recompresses files from bzip2, gzip, and xz formats to lzip format.
Each original is compared with the new file and then deleted. Only regular
files with standard file name extensions are recompressed, other files are
ignored. Compressed files are decompressed and then recompressed on the fly;
no temporary files are created. If an error happens while recompressing a
file, zupdate exits immediately without recompressing the rest of the files.
The lzip format is chosen as destination because it is the most appropriate
for long-term data archiving.
If no files are specified, recursive searches examine the current
working directory, and nonrecursive searches do nothing.
If no files are specified, recursive searches examine the current working
directory, and nonrecursive searches do nothing.
If the lzip compressed version of a file already exists, the file is
skipped unless the '--force' option is given. In this case, if the
comparison with the existing lzip version fails, an error is returned
and the original file is not deleted. The operation of zupdate is meant
to be safe and not produce any data loss. Therefore, existing lzip
compressed files are never overwritten nor deleted.
skipped unless the option '--force' is given. In this case, if the
comparison with the existing lzip version fails, an error is returned and
the original file is not deleted. The operation of zupdate is meant to be
safe and not cause any data loss. Therefore, existing lzip compressed files
are never overwritten nor deleted.
Combining the '--force' and '--keep' options, as in
'zupdate -f -k *.gz', verifies that there are no differences between
each pair of files in a multiformat set of files.
Combining the options '--force' and '--keep', as in
'zupdate -f -k *.gz', verifies that there are no differences between each
pair of files in a multiformat set of files.
The names of the original files must have one of the following
extensions: '.bz2', '.tbz', '.tbz2', '.gz', '.tgz', '.xz', '.txz'. The
files produced have the extensions '.lz' or '.tar.lz'.
extensions:
'.bz2', '.gz', and '.xz' are recompressed to '.lz'.
'.tbz', '.tbz2', '.tgz', and '.txz' are recompressed to '.tlz'.
Keeping the combined extensions ('.tgz' -> '.tlz') may be useful when
recompressing Slackware packages, for example.
Recompressing a file is much like copying or moving it; therefore
zupdate preserves the access and modification dates, permissions, and,
when possible, ownership of the file just as 'cp -p' does. (If the user
ID or the group ID can't be duplicated, the file permission bits S_ISUID
and S_ISGID are cleared).
Recompressing a file is much like copying or moving it; therefore zupdate
preserves the access and modification dates, permissions, and, when
possible, ownership of the file just as 'cp -p' does. (If the user ID or
the group ID can't be duplicated, the file permission bits S_ISUID and
S_ISGID are cleared).
The format for running zupdate is:
zupdate [OPTIONS] [FILES]
Exit status is 0 if all the compressed files were successfully
recompressed (if needed), compared and deleted (if requested). Non-zero
otherwise.
Exit status is 0 if all the compressed files were successfully recompressed
(if needed), compared, and deleted (if requested). Non-zero otherwise.
zupdate supports the following options:
'-f'
'--force'
Don't skip a file for which a lzip compressed version already
exists. '--force' compares the content of the input file with the
content of the existing lzip file and deletes the input file if
both contents are identical.
Don't skip a file for which a lzip compressed version already exists.
'--force' compares the content of the input file with the content of
the existing lzip file and deletes the input file if both contents are
identical.
'-k'
'--keep'
Keep (don't delete) the input file after comparing it with the
lzip file.
Keep (don't delete) the input file after comparing it with the lzip
file.
'-l'
'--lzip-verbose'
Pass a '-v' option to the lzip compressor so that it shows the
compression ratio for each file processed. Using lzip 1.15 and
newer, a second '-l' shows the progress of compression. Use it
together with '-v' to see the name of the file.
Pass one option '-v' to the lzip compressor so that it shows the
compression ratio for each file processed. Using lzip 1.15 or newer, a
second '-l' shows the progress of compression. Use it together with
'-v' to see the name of the file.
'-q'
'--quiet'
@ -759,8 +755,8 @@ otherwise.
'-r'
'--recursive'
For each directory operand, read and process all files in that
directory, recursively. Follow symbolic links in the command line,
but skip symlinks that are encountered recursively.
directory, recursively. Follow symbolic links given in the command
line, but skip symbolic links that are encountered recursively.
'-R'
'--dereference-recursive'
@ -769,12 +765,13 @@ otherwise.
'-v'
'--verbose'
Verbose mode. Show the files being processed. A second '-v' also
shows the files being ignored.
Verbose mode. Show the files being processed. A second '-v' also shows
the files being ignored.
'-0 .. -9'
Set the compression level of lzip. By default zupdate passes '-9'
to lzip.
Set the compression level of lzip. By default zupdate passes '-9' to
lzip. Custom compression options can be passed to lzip with the option
'--lz'. For example '--lz='lzip -9 -s64MiB''.

@ -783,14 +780,14 @@ File: zutils.info, Node: Problems, Next: Concept index, Prev: Zupdate, Up: T
10 Reporting bugs
*****************
There are probably bugs in zutils. There are certainly errors and
omissions in this manual. If you report them, they will get fixed. If
you don't, no one will ever know about them and they will remain unfixed
for all eternity, if not longer.
There are probably bugs in zutils. There are certainly errors and omissions
in this manual. If you report them, they will get fixed. If you don't, no
one will ever know about them and they will remain unfixed for all
eternity, if not longer.
If you find a bug in zutils, please send electronic mail to
<zutils-bug@nongnu.org>. Include the version number, which you can find
by running 'zupdate --version'.
<zutils-bug@nongnu.org>. Include the version number, which you can find by
running 'zupdate --version'.

File: zutils.info, Node: Concept index, Prev: Problems, Up: Top
@ -801,34 +798,34 @@ Concept index
[index]
* Menu:
* bugs: Problems. (line 6)
* common options: Common options. (line 6)
* getting help: Problems. (line 6)
* introduction: Introduction. (line 6)
* the zutilsrc file: The zutilsrc file. (line 6)
* zcat: Zcat. (line 6)
* zcmp: Zcmp. (line 6)
* zdiff: Zdiff. (line 6)
* zgrep: Zgrep. (line 6)
* ztest: Ztest. (line 6)
* zupdate: Zupdate. (line 6)
* bugs: Problems. (line 6)
* common options: Common options. (line 6)
* getting help: Problems. (line 6)
* introduction: Introduction. (line 6)
* the zutilsrc file: The zutilsrc file. (line 6)
* zcat: Zcat. (line 6)
* zcmp: Zcmp. (line 6)
* zdiff: Zdiff. (line 6)
* zgrep: Zgrep. (line 6)
* ztest: Ztest. (line 6)
* zupdate: Zupdate. (line 6)

Tag Table:
Node: Top222
Node: Introduction1149
Node: Introduction1148
Node: Common options3773
Ref: compressor-requirements5596
Node: The zutilsrc file5968
Node: Zcat6893
Node: Zcmp9445
Node: Zdiff11904
Node: Zgrep14608
Node: Ztest18603
Node: Zupdate20938
Node: Problems24364
Node: Concept index24898
Ref: compressor-requirements5844
Node: The zutilsrc file6216
Node: Zcat7149
Node: Zcmp9712
Node: Zdiff12202
Node: Zgrep14942
Node: Ztest18944
Node: Zupdate21451
Node: Problems25123
Node: Concept index25657

End Tag Table