| ls |
The ls is used to list files or directories |
| df [options] |
The df command is used to show the amount of disk space used and available |
| pwd |
The pwd command prints the current/working directory |
| source FILENAME |
The source command is used to read and execute the content of a file, passed as an argument in the current shell script. example source set_env.sh |
| sudo -i |
The sudo command is used to run commands as an administrator |
| rm |
The rm command is used to delete a file/folder in a working directory |
| rm -r |
The rm -r command is used to delete a folder with content |