'''head'''
-> Look at the first few lines of a text file

'''tail'''
-> Look at the last few lines of a text file

'''ls'''
-> To list the file in your current directory

'''cd'''
-> Change directory

'''cd ..'''
-> Move directory one level upper

'''man'''
-> manual

'''mv'''
-> move files

'''rm'''
-> remove files

'''exit'''
-> does exactly what it means

''' & '''
-> Run the process in the background

'''ps'''
-> list the processess

'''less'''
-> Look at text files

'''locate'''
-> find files

'''which'''
-> find programs