Appending a GZIP File


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Appending a GZIP File
# 1  
Old 11-09-2009
Appending a GZIP File

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,
M.Mohankumar.
# 2  
Old 11-09-2009
Hi,

As far as I know, your first command (zcat ... | gzip > d.gz) - 'cat's all the three compressed files - then compresses it, one after another and save it to a single file named d.gz.

In second case, you read a compressed file and append it to a file named d.gz. d.gz is NOT compressed. Adding a 'gz' to a file name does not compresses it.

Regards
# 3  
Old 11-09-2009
sorry ggs,

It is typo err

the actual second case is like

zcat a.gz |gzip >>d.gz
zcat b.gz |gzip >>d.gz
zcat c.gz |gzip >>d.gz


please let me know the exact diffenrence with gzip headers
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Shell script not able to zip the file using gzip

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

2. Shell Programming and Scripting

File name manipulation when extracting from gzip

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

3. Shell Programming and Scripting

Check if file is locked otherwise gzip it

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

4. Shell Programming and Scripting

Removing part of a file name and appending into a single file

I have two files like ABC_DEF_yyyyymmdd_hhmiss_XXX.txt and ABC_DEF_yyyyymmdd_hhmiss_YYY.txt. The date part is going to be changing everytime. How do i remove this date part of the file and create a single file like ABC_DEF_XXX.txt. (8 Replies)
Discussion started by: varlax
8 Replies

5. UNIX for Dummies Questions & Answers

gzip of a file in the same folder

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

6. UNIX for Advanced & Expert Users

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... (1 Reply)
Discussion started by: hanfresco
1 Replies

7. Shell Programming and Scripting

appending the count of line in each file at head of each file

hello everybody, I have some files in directory.each file contain some data. my requirement is add the count of each line of file in head of each file. any advice !!!!!!!! (4 Replies)
Discussion started by: abhigrkist
4 Replies

8. Solaris

gzip a file and append creation date stamp to file

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

9. Solaris

script for Gzip thousands of file

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

10. UNIX for Dummies Questions & Answers

How do I send a file as an attachment (gzip file) on a Unix system

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
Login or Register to Ask a Question