The shell is the Linux command line interpreter. It provides an interface between the user and the kernel and executes programs called commands.

Which command in Linux is used to help about any command?

To make you understand more easily about what help command does let’s try help command for finding out about help itself. -d option : It is used when you just want to get an overview about any shell built-in command i.e it only gives short description. -m option : It displays usage in pseudo-manpage format.

What is the output of who command?

Explanation: who command output the details of the users who are currently logged in to the system. The output includes username, terminal name (on which they are logged in), date and time of their login etc. 11.