some useful commands and features

Question 1

What command can show you the hidden files in current directory

Answer 1

ls -a

Question 2

This double click can help you to finish typing of the command, if you dont remember the full name of the command

Answer 2

double tab

Question 3

Which command shows you the type of the file

Answer 3

file

Question 4

Which types of commands do you know?

Answer 4

Builtin commands - executed by the Shell

External Commands - executed by the Kernel