Cat -opens and Shows a non-editable text file.
Less– does the same as Cat except it give you options to scroll up and down pages.
Reset – resets the command line if you accidentally do something like open a binary file.
file – displays information about the file.
* – adding an asterisks at the end of a command process for all files in the directory
rm – removes a file or rm -r removes entire directory with contents
mv – moves a file to a different directory or renames a file
mkdir – create a directory
touch – create a blank empty file.