Calling functions in Bash Scripting - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a function in bash scripting?

A function is a named block of code that performs a specific task and can be called multiple times in a script to avoid repetition.

beginner

How do you call a function named greet in bash?

Simply write the function name alone: greet. Parentheses are not used when calling functions in bash.

intermediate

What happens if you call a function before defining it in a bash script?

Bash will give an error because the function must be defined before it is called in the script.

beginner

How can you pass arguments to a bash function?

You pass arguments by writing them after the function name when calling it. Inside the function, use $1, $2, etc., to access them.

intermediate

What is the difference between calling a function with and without parentheses in bash?

In bash, calling a function with or without parentheses is not the same. You call a function by its name without parentheses, e.g., func. Using parentheses like func() is a syntax error.

How do you call a function named hello in bash?

A call hello

B hello

C function hello()

D run hello

In bash, you call a function simply by writing its name.

What will happen if you call a function before defining it in a bash script?

A The function runs normally

B The script ignores the call

C The function is defined automatically

D Bash throws an error

Bash requires functions to be defined before they are called, or it will throw an error.

How do you access the first argument passed to a bash function?

A $1

B $first

C $arg1

D $0

Inside a bash function, the first argument is accessed using $1.

Which of these is a valid way to call a function named myfunc?

A call myfunc()

B run myfunc

C myfunc()

D function myfunc

Calling a function with parentheses like myfunc() is valid in bash.

Can you call a bash function without parentheses?

A Yes, parentheses are optional

B No, parentheses are required

C Only if the function has no arguments

D Only in bash version 5 or higher

In bash, parentheses are optional when calling functions.

Explain how to define and call a function in bash with an example.

Think about how you write a function and then use its name to run it.

Describe how to pass and access arguments inside a bash function.

Arguments are like inputs you give when calling the function.