X-Git-Url:
http://git.cworth.org/git/gzip/blobdiff_plain/bef5279812845d49f988580e076
c0ca597078dfd..db00b4e39677b0dbf3ea6f7694e0eac7be4ef141:/gzip.doc
diff --git a/gzip.doc b/gzip.doc
index 91dbb6d..5fc3452 100644
--- a/gzip.doc
+++ b/gzip.doc
@@ -73,8 +73,10 @@ User Commands
GZIP(1)
Files created by zip can be uncompressed by gzip only if
they have a single member compressed with the 'deflation'
method. This feature is only intended to help conversion of
tar.zip files to
the tar.gz format. To
extract
zip
files
with several members, use unzip instead of
gunzip.
+
tar.zip files to
the tar.gz format. To extract a zip file
+
with a single member, use a command like gunzip <foo.zip or
+
gunzip -S .zip foo.zip.
To extract zip files with several
+
members, use unzip
instead
of gunzip.
zcat is identical to gunzip -c. (On some systems, zcat may
be
installed as gzcat to preserve
the original link to com@@ -100,6 +102,18 @@ User Commands
GZIP(1)
almost never increases. gzip preserves the mode, ownership
and timestamps of files when compressing or decompressing.
+
The gzip file format is specified in P. Deutsch, GZIP file
+
format specification version 4.3, <ftp://ftp.isi.edu/in+
notes/rfc1952.txt>, Internet RFC 1952 (May
1996).
The zip
+
deflation format
is specified in P. Deutsch, DEFLATE Com+
pressed
Data
Format
Specification
version
1.3,
+
<ftp://ftp.isi.edu/in-notes/rfc1951.txt>,
Internet RFC 1951
+
(May 1996).
+
+SunOS 5.8
Last change: local
2
+
+User Commands
GZIP(1)
+
OPTIONS
-a
--ascii
Ascii
text mode: convert end-of-lines
using local con@@ -109,11 +123,6 @@ OPTIONS
pressing.
-c
--stdout --to-stdout
-SunOS 5.8
Last change: local
2
-User Commands
GZIP(1)
Write
output on standard output; keep original files
unchanged.
If there
are several input files, the output consists of a sequence of
independently compressed
@@ -157,6 +166,11 @@ User Commands
GZIP(1)
method: compression method
crc: the 32-bit CRC of the uncompressed data
+
+SunOS 5.8
Last change: local
3
+
+User Commands
GZIP(1)
+
date & time: time
stamp for the uncompressed file
The compression methods
currently
supported
are
@@ -166,10 +180,6 @@ User Commands
GZIP(1)
With --name, the uncompressed
name, date and time are
those
stored within the compress file
if present.
-SunOS 5.8
Last change: local
3
-User Commands
GZIP(1)
With --verbose, the size totals and compression ratio
for all files is also displayed, unless some
sizes are
unknown. With --quiet, the title and totals lines are
@@ -214,6 +224,10 @@ User Commands
GZIP(1)
decompression
on all
given files regardless of suffix,
as in:
+SunOS 5.8
Last change: local
+
+User Commands
+
gunzip -S "" *
(*.*
4
GZIP(1)
for MSDOS)
Previous versions of gzip used the .z suffix.
@@ -222,10 +236,6 @@ User Commands
-t
--test
Test.
Check the compressed file integrity.
This
was
GZIP(1)
-SunOS 5.8
Last change: local
4
-User Commands
GZIP(1)
-v
--verbose
Verbose. Display the
name and percentage reduction for
each file compressed or decompressed.
@@ -271,6 +281,10 @@ ADVANCED USAGE
If
you want to recompress concatenated files to get better
compression, do:
+SunOS 5.8
+
+User Commands
+
gzip
Last change: local
5
GZIP(1)
-cd old.gz | gzip > new.gz
If
a compressed file consists of several members, the uncom@@ -278,10 +292,6 @@ ADVANCED USAGE
to
the last member only.
If you need the uncompressed
size
for all members, you can use:
-SunOS 5.8
-User Commands
gzip
Last change: local
5
GZIP(1)
-cd file.gz | wc -c
If
you wish to create a single archive
@@ -327,6 +337,11 @@ DIAGNOSTICS
file
with
multiple
file: Corrupt input. Use zcat to recover some data.
The compressed file
has been damaged. The data up to
+
+SunOS 5.8
Last change: local
6
+
+User Commands
GZIP(1)
+
the point of failure can be recovered using
zcat file > recover
@@ -334,11 +349,6 @@ DIAGNOSTICS
file: compressed with xx bits, can
only handle yy bits
File was compressed (using LZW) by a program that could
deal
with more bits than the decompress code on this
-SunOS 5.8
Last change: local
6
-User Commands
GZIP(1)
machine. Recompress the file
with gzip, which compresses better and uses less memory.
@@ -385,17 +395,16 @@ CAVEATS
data on tapes. (This example assumes you
version of tar.)
are using the GNU
+SunOS 5.8
Last change: local
7
+
+User Commands
GZIP(1)
+
BUGS
The gzip format represents the the
input size modulo 2^32,
so
the --list option reports incorrect uncompressed sizes
and compression ratios for uncompressed
files 4 GB and
larger.
To work
around this problem, you can use the following command to discover a large
uncompressed file's true
-SunOS 5.8
Last change: local
7
-
-User Commands
size:
GZIP(1)
zcat
file.gz
| wc -c
@@ -408,8 +417,8 @@ User Commands
redundant files, compress compresses better than gzip.
+
+
GZIP(1)
COPYRIGHT NOTICE
Copyright (C) 1998, 1999,
2001 Free Software Foundation,
Inc.
Copyright (C) 1998, 1999, 2001, 2002 Free
Software Foundation, Inc.
Copyright (C) 1992, 1993 Jean-loup
Gailly
Permission is granted to make and distribute verbatim copies