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,
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi,
How do I send a file as an attachment (gzip file) on a Unix system ? Using sendmail.
Please help me.
:confused: (3 Replies)
Discussion started by: lacca
3 Replies
2. Solaris
Hi experts,
I have thousands of file (data file and Gziped file) in same directory like below--
bash-2.05$ pwd
/home/mmc
bash-2.05$ file PP023149200709270546
TT023149200709270546: gzip compressed data - deflate method
bash-2.05$ file PP027443200711242320
TT027443200711242320: ... (10 Replies)
Discussion started by: thepurple
10 Replies
3. Solaris
I want to gzip a file and append the creation date to the end of the file. How can I accomplish this task. Basically they are log files which need a creation date stamp appended to make sure they do not overwrite other log files.
-jack (3 Replies)
Discussion started by: jacktravine
3 Replies
4. Shell Programming and Scripting
Guys,
I just want to know the difference in following (core difference)
zcat a.gz b.gz c.gz |gzip >d.gz
And
zcat a.gz >>d.gz
zcat b.gz >>d.gz
zcat c.gz >>d.gz
do we have 3 gzip header in 1st and only one in second case.
please let me know this in detail
Thanks,... (2 Replies)
Discussion started by: mohan_xunil
2 Replies
5. Programming
Hi all...
I have the following code:
FILE *fp = popen(" gzip -dc /somemount/somefile.gz", "r");
while(fgets(buffer, 1024, fp))
{
some code....
}
"/somemount" is a mount of some network drive. Sometimes error occurs in while loop - I can see the following "Input/Output error"... (4 Replies)
Discussion started by: adm1n
4 Replies
6. UNIX for Dummies Questions & Answers
I want gzip of a file in the same folder where it is kept now
$filename = '/var/dev/test.txt'
/opt/home/>> gzip -c $filename > test.txt.gz
however command creates it in the folder in /opt/home/
How to gzip a file in the same directory where it is now , no matter from where we execute and also... (2 Replies)
Discussion started by: lalitpct
2 Replies
7. Shell Programming and Scripting
Dear community,
I've a continuos tcpdump on redhat that close the dumped file every 100000 captured packets.
To avoid disk full I would like to gzip the closed *.cap file. But how can I check if the file is currently opened by tcpdump and skip it from gzip?
Thanks!
EDIT: Just to post an... (9 Replies)
Discussion started by: Lord Spectre
9 Replies
8. Shell Programming and Scripting
Hi,
Below is the description of my problem.
I am trying to loop through the below file names sitting in the file - FileNames.txt, and trying to decompress them
FileNames.txt
20150408_MGAC_.txt.gz
20150408_MGCC_.txt.gz
20150408_MGSH__.txt.gz
20150408_MGSL__.txt.gz
... (6 Replies)
Discussion started by: Richmond_CS
6 Replies
9. Shell Programming and Scripting
Hi all,
I am calling Temp.sh and it is has simple line
$gpath=`which gzip`
$gpath $FilePath/My_temp.log
if I run this script, logging to server then its works fine. But when I send this script over the SSH it does not work at it. gzip is command is not execute.
I am using
gzip 1.6... (2 Replies)
Discussion started by: girijajoshi
2 Replies
10. UNIX for Beginners Questions & Answers
Hello,
I am trying to send a gzip file on email using below command but the zipped file received on email is corrupt.
mailsend -smtp $smtpip -content-type 'application/x-gzip' -mime-type "application/x-gzip" -t $receiver -f $sender -sub "$subject" -M "$MSG" -attach $file
file name is ... (1 Reply)
Discussion started by: tushar.modgil
1 Replies
LEARN ABOUT DEBIAN
wibble-test-genrunner
wibble-test-genrunner(1) General Commands Manual wibble-test-genrunner(1)
NAME
wibble-test-genrunner - Code generator for wibble testsuites.
SYNOPSIS
wibble-test-genrunner header <file>
wibble-test-genrunner main <files>
DESCRIPTION
The program generates .cpp files that are then compiled and linked into a test program for running tests from .test.h files. Examples of
such .test.h files may be found among wibble headers, eg. /usr/include/wibble/regexp.test.h.
In the first form, the program processes a single header file (usually of the form foo.test.h) and produces a corresponding .cpp file to be
compiled. In the second form, it takes as <files> all the .test.h headers and produces a single main.cpp which contains the main() function
of the test program, which then runs all the tests in all the .test.h files. The generated source code is always written to standard output
and it is left up to the user to redirect it to a meaningful location.
The program currently has no options other than the two forms above. The program is intended to be run as part of build process of programs
or libraries using the wibble testing framework. For convenient use from CMake, there is a test.cmake script under /usr/share/wibble, that
takes care of producing all the .cpp files (both per-header and the main one), compiling them and linking them into a single binary which
executes the testsuite.
AUTHOR
Petr Rockai <me@mornfall.net>
wibble-test-genrunner(1)