Question

Question:

I want to untar a tarfile which has many tar files within itself and remove the files in all the tar files and I want all of these processes to run in parallel in Unix bash scripting.

Conditions:

1. The script should return an error if any untar/remove process has any error.
2. It should only return success after all N (untar and remove) processes complete successfully.

Proposed solution:

 mkdir a
 tar -C a -xvf b.tar
 cd a
 for i in *
 do
 rm -r $i &
 done

Answer 1

mkdir a
tar -C a -xvf b.tar
 cd a
 success=$(for i in *
 do
 rm -r $i || echo failed & # if a job fails false will be echoed
 done
 wait)
 # if any of the jobs failed, success will be set to a value other than ""
 [[ -z "$success" ]] && exit 0 || exit 1