Answer:
1. touch command
2. wall command
3.apt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library
4. -rwxrw-r-
5. sudo command
6. read command is used for getting user input in a Linux shell script.
7. top command
8. ask them to use dig command.
9. Type echo $PATH at the command prompt and press ↵ Enter
10. If a process is already in execution, such as the tar command example below, simply press Ctrl+Z to stop it then enter the command bg to continue with its execution in the background as a job. You can view all your background jobs by typing jobs.