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Shell Programming and Scripting
Show Percentage Compression in GZIP
Post 302833179 by vinay4889 on Tuesday 16th of July 2013 11:46:53 AM
07-16-2013
Quote:
So, I think:
1. Your problem is that whatever you used to do the % calculation overflowed integers and gave garbage results. Those are 20GB files.
2. In fact, you appear to have had about 6% compression.
3. That 6% was probably because there were a lot of executable files/binary data files in the tar file. Those do not compress as well as text. "Normal" compression is on the order of 70%.
Code:
gzip -v
Code:
gunzip -v
And yes it is ture, no matter what compression % it showed , file is compressed.
Thanks for the help - Corona and Jim
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LEARN ABOUT OPENSOLARIS
fiocompress
fiocompress(1M) System Administration Commands fiocompress(1M) NAME
fiocompress - file compression utility SYNOPSIS
/sbin/fiocompress -c [-m] [-b block_size] input_file output_file /sbin/fiocompress -d input_file output_file DESCRIPTION
The fiocompress utility is a file compression tool that works together with the dcfs(7FS) file system to perform per-file compression. You can use fiocompress to decompress a compressed file or mark a compressed file as compressed, causing automatic decompression on read. The primary use of fiocompress is to compress files in the boot archive. Note that this utility is not a Committed interface. See attributes(5). OPTIONS
The following options are supported: -b block_size Specify a block size for compression. The default block size is 8192. -c Compress the specified file. -d Decompress the specified file. -m Mark the compressed file for automatic decompression on read. Can be used only in conjunction with -c. EXIT STATUS
0 The command completed successfully. -1 The command exited due to an error. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsr | +-----------------------------+-----------------------------+ |Interface Stability |Private | +-----------------------------+-----------------------------+ SEE ALSO
boot(1M), bootadm(1M), dcfs(7FS), ufs(7FS), attributes(5) NOTES
This compression/decompression utility works only with files stored in a UFS file system. There is no obvious way to determine whether a given file is compressed, other than copying the file and comparing the number of disk blocks of the copy against the original. SunOS 5.11 10 Dec 2008 fiocompress(1M)