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Old 10-14-2010, 11:38 AM   #1
tank junior
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Registered: Apr 2010
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creating tar : shell vs ui, size differs


Hi,

os :: ubuntu hardy

In a shell script, I am creating a .tar using this command
Code:
tar -zcvf dst/lib/library.tar.gz dst/lib
There are two problems:

1. The library.tar.gz is created but inside .tar the folder structure is like this : dist/lib/(all dirs and files). I don't need dist/lib structure inside .tar but all the dirs and files of dist/lib directly under .tar.

2. Using above command .tar is coming out around 7.7 mb in size but when I creating tar by manually selecting all dirs and files and creating .tar by right-click-menu>create archive>(.tat.gz option), .tar is coming out around 4.4 mb. Why is that difference? Is is possible to get more compression but keeping format to .tar.gz using 'tar' shell command?

3. Is it possible to move files when creating a .tar? (create and delete them) or shall I do it manually?

Thanks

Prashant
 
Old 10-14-2010, 12:08 PM   #2
crabboy
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Registered: Feb 2001
Location: Atlanta, GA
Distribution: Slackware
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1. This is the way that tar works, it will store all path information to the files. This is the only way that will work when adding subdirectories. To remove the unwanted path, you'll have to cd to the /dst/lib directory before executing the tar command.

2. I'm not familiar with .tat files, I'd guess that the compression ratio is different between the two. It does not look like you can specify the compression level on the command line, you'd have to tar and gzip in separate commands or pipe the output to gzip.

Code:
cd /dst/lib
tar -cvf - * | gzip -9 > library.tar.gz
3. I'm not sure what the question is here.
 
  


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