The root directory is represented by _____

The first line in any shell script begins with a _____ ?

How many basic arithmetic operations can the expr command perform?

Where are we placed when logging in as the root user?

The ______ allows us to read data from the same file containing the script.

How to terminate the user's environment mode created using su -?

Which of the following commands is used to spawn a child process to run a script?

Which command is used for counting words, lines, and characters in a file? 

Which comparison operator is used to test for numeric equality or inequality?

Which of the following characters cannot be used in a filename?