For the distribution X:           

How do you access the value of a variable named `USERNAME` in a shell script?

What does $# represent in a shell script?

How can you pass command-line arguments to a shell script?

In shell scripting, how do you assign the string "Hello World" to a variable named `MESSAGE`?

To check if a file /tmp/data.txt is both readable and writable by the current user in a shell conditional, which test is correct?

Which command is used to read user input from the keyboard and store it in a variable?

Which command is used to search for a string inside a file?

Which command safely iterates over filenames that may contain spaces and newlines in a shell script?

Extended globbing in bash allows:

Which operator enables process substitution?