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Full Discussion: gzip vs pipe gzip: produce different file size
Top Forums UNIX for Advanced & Expert Users gzip vs pipe gzip: produce different file size Post 302527624 by hanfresco on Friday 3rd of June 2011 09:24:50 PM
Old 06-03-2011
gzip vs pipe gzip: produce different file size
Hi All,

I have a random test file: test.txt, size: 146
$ ll test.txt
$ 146 test.txt

Take 1:
$ cat test.txt | gzip > test.txt.gz
$ ll test.txt.gz
$ 124 test.txt.gz

Take 2:
$ gzip test.txt
$ ll test.txt.gz
$ 133 test.txt.gz

As you can see, gzipping a file and piping into gzip produce different sized *gz files. The problem currently is that some archivers, such as WinZip and Cygwin's gunzip have to unzip the piped gzip file twice before it can be read as a plain text file. Why is this and how can I ensure piping into gzip produces the same file as gzipping a file?

Thanks,
 

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LEARN ABOUT DEBIAN

mongofiles

MONGOFILES(1)							  Mongo Database						     MONGOFILES(1)

NAME

       mongofiles - a simple GridFS interface

SYNOPSIS

       mongofiles [OPTIONS]

DESCRIPTION

       mongofiles is used to list, get, and insert files in the database.

EXAMPLES

       mongofiles list
	      lists files in test.fs.files

       mongofiles put README.txt
	      inserts the file README.txt into the collection test.fs.files

       mongofiles get photo.jpg
	      retrieves photo.jpg from test.fs.files and saves it locally

OPTIONS

       --help show usage information

       -h, --host HOST
	      mongo host to which to connect

       -d, --db DB
	      database to use (default DB=test)

       -c, --collection COLLECTION (default COLLECTION=fs.files)
	      collection to use

       --command [list|search|put|get]
	      execute a command

       --file FILE
	      filename for get or put

       list   list all files.  takes an optional filename.  the file has to start with the filename

       search search all files for something that contains the string

COPYRIGHT

       Copyright 2007-2009 10gen

SEE ALSO

       For more information, please refer to the MongoDB wiki, available at http://www.mongodb.org.

AUTHOR

       Kristina Chodorow

10gen								     June 2009							     MONGOFILES(1)
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