010-160 Basic Scripting Concepts 2

Question 1

Which shell built-in command is used to read a line of input from the user and store it in a variable?

Accepted Answer

read

Answer

The `read` built-in reads a line from standard input and assigns it to the named variable.

Question 2

What does the following condition test in a bash `if` statement: `[ -f /etc/hosts ]`?

Accepted Answer

Whether /etc/hosts exists and is a regular file

Answer

The `-f` file test operator returns true when the path exists and is a regular file.

Question 3

In bash, what is the value of `$?` after a command exits successfully?

Accepted Answer

0

Answer

`$?` holds the exit status of the last command; 0 conventionally means success.

Question 4

Which of the following correctly defines a shell function named `greet`?

Accepted Answer

greet() { echo Hello; }

Answer

The POSIX-compatible syntax `name() { commands; }` defines a shell function.

Question 5

What arithmetic value does `$(( 3 ** 2 ))` evaluate to in bash?

Accepted Answer

9

Answer

The `**` operator performs exponentiation, so 3 to the power of 2 equals 9.

(010-160) LPI Linux Essentials Practice Test