Remove a given folder from a Git repository…

git rm -r cache/

Create an iso image of a directory

mkisofs -J -allow-leading-dots -R -V "Label CD" -iso-level 4 -o ./cd.iso data_cd

This command moves all the files in the subfolder to the current folder.

mv */* .

Copying a directory

cp -a dir1 dir2

Remove two directories and their contents recursively

rm -rf dir1 dir2

Remove a directory called ‘dir’ and contents recursively

rm -rf dir

Search string “test_text” at directory ‘/var/log’ and below

grep test_text -R /var/log/*

Estimate space used by directory.

du -sh dir

Go back to the previous folder

cd -

You can create a directory tree using just one command in Linux

mkdir -p /tmp/dir1/dir2