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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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gst-md5sum-0.8(1)						   User Commands						 gst-md5sum-0.8(1)

NAME
gst-md5sum-0.8, gst-md5sum - get an md5sum of a GStreamer pipeline through md5sink SYNOPSIS
gst-md5sum-0.8 [--verbose] [gst-std-options] [partial-pipeline-description] gst-md5sum [--verbose] [gst-std-options] [partial-pipeline-description] [--gst-list-mm] [--gst-mm=string] [--print] DESCRIPTION
gst-md5sum-0.8 generates MD5 checksums of the data generated by a GStreamer pipeline. In theory, both of the following commands should print out the same checksum: gst-md5sum-0.8 filesrc location=music.mp3 md5sum music.mp3 If the pipeline contains an md5sink element, gst-md5sum-0.8 queries it for the md5sum at the end of pipeline iteration. If the pipeline does not contain an md5sink element, gst-md5sum-0.8 automatically connects an md5sink to the right-hand side of the given pipeline. See gst-launch(1) or the GStreamer documentation for more information on how to create a partial-pipeline-description. gst-md5sum is a wrapper script that runs the latest installed version of gst-md5sum-X.X. For example, if both gst-md5sum-0.7 and gst- md5sum-0.8 are installed on your system, gst-md5sum runs gst-md5sum-0.8. OPTIONS
The following options are supported by gst-md5sum-0.8 and gst-md5sum: --verbose Output verbose information. You can also use -v to specify this option. gst-std-options Standard options available for use with most GStreamer applications. See gst-std-options(5) for more information. The following options are supported by gst-md5sum only: --gst-list-mm List found major/minor versions. This option displays the versions that are available. --gst-mm=string Force major/minor version. This option enables you to specify a specific version to run, if you do not want to run the default version. --print Print wrapped command line. This option displays the command that will be run, and then runs the command. OPERANDS
The following operands are supported: partial-pipelinePartialppipeline description. EXAMPLES
Example 1: Running the Wrapper Script and Displaying the Command Name example% gst-md5sum --print /usr/bin/gst-md5sum-0.8 FILES
The following files are used by this application: /usr/bin/gst-md5sum-0.8 Executable for GNOME help browser /usr/bin/gst-md5sum Wrapper script that runs the latest installed version of gst-md5sum-X.X ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWgnome-media | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
gst-complete(1), gst-compprep(1), gst-feedback(1), gst-inspect(1), gst-launch(1), gst-launch-ext(1), gst-register(1), gst-thumbnail(1), gst-typefind(1), gst-xmlinspect(1), gst-xmllaunch(1), gstreamer-properties(1), libgstreamer-0.8(3), libgstgetbits(3), gst-std-options(5) NOTES
Original man page written by the GStreamer team at http://gstreamer.net/. Updated by Brian Cameron, Sun Microsystems Inc., 2004. SunOS 5.10 14 Oct 2004 gst-md5sum-0.8(1)
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