Extracting specific files from multiple .tgz files


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# 1  
Extracting specific files from multiple .tgz files

Hey,

I have number of .tgz files and want to extract the file with the ending *results.txt from each one.

I have tried

Code:
for file in *.tgz; do tar --wildcards -zxf $file *results.txt; done

as well as

Code:
list=$(ls *.tgz)
for i in $list; do tar --wildcards -zxvf $i *.results.txt; done

without results.
Any help would be much appreciated.

Thanks
# 2  
I don't think you can use a wildcard when extracting as the shell would have nothing to match against before passing it to the tar command. You may need to have a two-step process:-
  • one pass with tar -t to get all files and use grep to filter out the filenames you want
  • seconds pass to extract the files you have determined are present in each tarfile.
It seems a little wasteful, but it should work. When it's working for a single tarfile, just put it in a loop for all the tarfiles.


I may be wrong though. What happens if you wrap the filename with the * in single quotes like this?
Code:
for file in *.tgz; do tar --wildcards -zxf $file '*results.txt'; done

This would pass the literal text including the * through to the tar command and might work.


I hope that this helps,
Robin
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