Untar a multi-volume tar splitted file

One way to untar multi-volume tar files (splitted) is to use a combination of CAT and TAR command.

   cat splitFile1 splitFile2 | tar -xf -

You can also add a v to your tar command to make verbose.

Bash - create subfolder in each folder

I recently had to add a subfolder to each folder inside a directory in a directory that had more than 100 folders it was a bit tedious to copy paste the folder inside each one of them.Thankfully this can easily done with a bash command :

cd /opt/myfolder
for f in *; do mkdir "$f/myFolder"; done