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Top Forums UNIX for Dummies Questions & Answers gzip produces different output from the same input Post 302433319 by pludi on Tuesday 29th of June 2010 08:11:02 AM
Old 06-29-2010
Because gzip saves, into the file, the modification time of the file, as well as the original file name if possible:
Code:
$ echo "TestTestTest" > test1.txt
$ stat test1.txt
  File: `test1.txt'
  Size: 13              Blocks: 8          IO Block: 4096   regular file
Device: 801h/2049d      Inode: 1872126     Links: 1
Access: (0644/-rw-r--r--)  Uid: (    1000/   pludi)   Gid: (  100/   users)
Access: 2010-06-29 14:04:56.000000000 +0200
Modify: 2010-06-29 14:04:56.000000000 +0200
Change: 2010-06-29 14:04:56.000000000 +0200
$ gzip -9c test1.txt > test1_1.txt.gz
$ touch test1.txt
$ stat test1.txt
  File: `test1.txt'
  Size: 13              Blocks: 8          IO Block: 4096   regular file
Device: 801h/2049d      Inode: 1872126     Links: 1
Access: (0644/-rw-r--r--)  Uid: (    1000/   pludi)   Gid: (  100/   users)
Access: 2010-06-29 14:05:14.000000000 +0200
Modify: 2010-06-29 14:05:14.000000000 +0200
Change: 2010-06-29 14:05:14.000000000 +0200
$ gzip -9c test1.txt > test1_2.txt.gz
$ md5sum test1_?.txt.gz
de2048a553d7f5fe9815f4d0f0c286e3  test1_1.txt.gz
02e66fb2b786c4585f012dff592010f3  test1_2.txt.gz
$ file test1_?.txt.gz
test1_1.txt.gz: gzip compressed data, was "test1.txt", from Unix, last modified: Tue Jun 29 14:04:56 2010, max compression
test1_2.txt.gz: gzip compressed data, was "test1.txt", from Unix, last modified: Tue Jun 29 14:05:14 2010, max compression

If it can't save the original files modification time (eg because it's being piped into gzip) it saves the creation time of the compressed file instead.
This User Gave Thanks to pludi For This Post:
 

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unix2dos(1)						      General Commands Manual						       unix2dos(1)

NAME
unix2dos - UNIX to DOS text file format converter SYNOPSYS
unix2dos [options] [-c convmode] [-o file ...] [-n infile outfile ...] Options: [-hkqV] [--help] [--keepdate] [--quiet] [--version] DESCRIPTION
This manual page documents unix2dos, the program that converts text files in UNIX format to DOS format. OPTIONS
The following options are available: -h --help Print online help. -k --keepdate Keep the date stamp of output file same as input file. -q --quiet Quiet mode. Suppress all warning and messages. -V --version Prints version information. -c --convmode convmode Sets conversion mode. Simulates unix2dos under SunOS. -o --oldfile file ... Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used. -n --newfile infile outfile ... New file mode. Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be used or you WILL lost your files. EXAMPLES
Get input from stdin and write output to stdout. unix2dos Convert and replace a.txt. Convert and replace b.txt. unix2dos a.txt b.txt unix2dos -o a.txt b.txt Convert and replace a.txt in ASCII conversion mode. Convert and replace b.txt in ISO conversion mode. unix2dos a.txt -c iso b.txt unix2dos -c ascii a.txt -c iso b.txt Convert and replace a.txt while keeping original date stamp. unix2dos -k a.txt unix2dos -k -o a.txt Convert a.txt and write to e.txt. unix2dos -n a.txt e.txt Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt. unix2dos -k -n a.txt e.txt Convert and replace a.txt. Convert b.txt and write to e.txt. unix2dos a.txt -n b.txt e.txt unix2dos -o a.txt -n b.txt e.txt Convert c.txt and write to e.txt. Convert and replace a.txt. Convert and replace b.txt. Convert d.txt and write to f.txt. unix2dos -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt DIAGNOSTICS
BUGS
The program does not work properly under MSDOS in stdio processing mode. If you know why is that so, please tell me. AUTHOR
Benjamin Lin - ( blin@socs.uts.edu.au ) MISCELLANY
Tested environment: Linux 1.2.0 with GNU C 2.5.8 SunOS 4.1.3 with GNU C 2.6.3 MS-DOS 6.20 with Borland C++ 4.02 Suggestions and bug reports are welcome. SEE ALSO
dos2unix(1) 1995.03.31 unix2dos v2.2 unix2dos(1)
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