Help on untar files in one command


 
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Top Forums Shell Programming and Scripting Help on untar files in one command
# 1  
Old 09-19-2011
Help on untar files in one command

Hi All,

I need your help to find out an easy way to untar files from a tar file.

For example, I have a tar file which contains a lot of files that needs to untar in certain directories. I would like to untar them using one command instead of typing the following commands which is taking lots of time. Is there an easy way to do that?
Code:
tar -xvf ABC.tar bin/file1
tar -xvf ABC.tar bin/name
tar -xvf ABC.tar bin/address
tar -xvf ABC.tar bin/status
tar -xvf ABC.tar bin/city
tar -xvf ABC.tar bin/country
…………………………… 
…………………………… 



tar -xvf ABC.tar lib/file7
tar -xvf ABC.tar lib/post
tar -xvf ABC.tar lib/get


Last edited by Scott; 09-19-2011 at 12:36 PM.. Reason: Code tags
# 2  
Old 09-19-2011
How many files?

Code:
tar -xvf ABC.tar bin/file1 bin/name bin/address bin/status bin/city bin/country lib/file7 lib/post lib/get

# 3  
Old 09-19-2011
Thanks for your quick response. I have about 35 files in bin and 74 files in lib to untar. I think I can put them in a input file then run it as following...
Code:
for i in `ls tar_list`
do
tar -xvf ABC.tar $i
done

any other easy thoughts?

Last edited by Scott; 09-19-2011 at 01:07 PM.. Reason: Added code tags
# 4  
Old 09-19-2011
Not sure what "tar_list" is. A file containing a list of the files to untar, I presume, so that should probably be "cat tar_list"?

No need for the cat, anyway:

Code:
while read i; do
  tar -xvf ABC.tar "$i"
done < cat_list

# 5  
Old 09-19-2011
yes tar_list contains all the untar file lists. sorry, I actually meant
Code:
 
for i in `cat tar_list`
do
tar -xvf ABC.tar $i
done

thank you for your help

Moderator's Comments:
Mod Comment Please use code tags...

Last edited by Scott; 09-19-2011 at 01:53 PM.. Reason: Code tags
# 6  
Old 09-19-2011
As I said, there's no need for "cat".

A shorter alternative:

Code:
xargs < tar_list -I{} tar xf ABC.tar {}

(you can add the xargs -n option if there's too many files)
# 7  
Old 09-19-2011
That's a useless use of backticks and useless use of cat and almost always better done as

Code:
while read LINE
do
...
done < filename

As for how to feed all those filenames into tar, if none of the files contain spaces or quotes in filenames, it's easy enough, use xargs. "echo a b c | xargs command" amounts to "command a b c", and it can read from a file.
Code:
xargs tar -xvf filename.tar < tar_list

If possible it will squeeze it alll into one tar call, but for too many files, it may have to break it into a few.
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