How many types of shell variables are there in Linux/Unix?

How to make a script executable?

Which option is used to create a user's login environment?

To spawn a child of our own choice for running the script, we can use ___ command

Which shell variable can be used to get the exit status of the last executed command?

Which of the following options with sed is used to write selected lines to a separate file?

When we log in, the UNIX system places us in a directory called the ______ directory.

Which of the following comparison operators implies 'greater than' and 'less than' respectively?

What is a directory file?

What are positional parameters?