UNIX for Dummies Questions & Answers

Hi,

I am currently reading a tar file and searching for a particular word using

Code:

 grep

e.g. Plane. At the moment, if a sentence is found with the word "Plane" the sentence itself is piped to another file.

Here is the code i am using;

Code:

for jar in 'cat jar_file.tar'; do
 
tar -tvf jar_file.tar | grep Plane >> $FILTER_RESULT
 
done

What i would like to do is ignore any sentence with the word "Plane" in it and pipe any other line in the file to a seperate file e.g.

Code:

for jar in 'cat jar_file.tar'; do
 
tar -tvf jar_file.tar | grep Plane 
 
if (current result of grep does not contain "Plane")
 
          non-plane sentence >> new_file
fi
 
done

I was thinking of using a test case and checking the exit status of grep but i cant get my head around the logic of transferring a non-plane sentence to a new file.

If i have made anything unclear please let me know

Any help would be greatly appreciated.

Thanks in advance

Hi, This:

Code:

for jar in 'cat jar_file.tar'; do
..
done

Has no effect whatsoever. You can leave those two lines out IMO.

Code:

tar -tvf jar_file.tar | grep -v Plane > new_file

I don't think that this script does what you think.

The for-do-done loop does nothing except cause the "tar -tvf" to run once. The same would happen if the for-do-done loop was not there.

The "tar -tvf jar_file.tar" command produces a detailed directory list of the contents of the archive file "jar_file.tar". Please try it and post the output from the command. What we suggest next depends on whether the archive file contains only relative path names.


The "grep Plane" statement is therefore only searching a directory list not the files in the archive.

(Just seen Scrutinizer's post).

As we will need to extract each file in order to run the search we need to be sure that none of the filenames clash with files in the current directory and that the archive was created with relative path names.

Thanks guys that really helped