List directory contents: ls

* Change directory:

cd

* Print working directory:

pwd

Create directory: mkdir

Remove directory: rmdir

Copy files/directories: cp

Move/rename files/directories: mv

Concatenate and display file content: cat

Create empty file: touch

Remove files/directories: rm

Find files in the system: find

Locate a command: which

Estimate file space usage: du

Report file system disk space usage: df