Function arguments ($1, $2 inside function) in Bash Scripting - Cheat Sheet & Quick Revision

Recall & Review

beginner

What do $1 and $2 represent inside a bash function?

$1 and $2 are the first and second arguments passed to the function when it is called.

beginner

How do you access the third argument inside a bash function?

You use $3 to access the third argument passed to the function.

beginner

True or False: $1 inside a bash function refers to the first argument passed to the script, not the function.

False. Inside a function, $1 refers to the first argument passed to that function, not the script.

beginner

How can you pass arguments to a bash function?

You call the function followed by the arguments separated by spaces, like myfunc arg1 arg2. Inside the function, $1 will be arg1, $2 will be arg2.

beginner

What happens if you call a bash function without arguments but try to use $1 inside it?

$1 will be empty or unset because no argument was passed to the function.

Inside a bash function, what does $2 represent?

A The second environment variable

B The second argument passed to the script

C The second argument passed to the function

D The second line of the script

$2 inside a function is the second argument passed to that function.

How do you pass arguments to a bash function named greet?

A greet arg1 arg2

B greet(arg1, arg2)

C greet[arg1, arg2]

D greet: arg1 arg2

In bash, you call functions with arguments separated by spaces, like greet arg1 arg2.

What will $1 be inside a function if you call it without any arguments?

A An error message

B The first argument of the script

C The function name

D Empty or unset

If no arguments are passed, $1 inside the function is empty or unset.

Which symbol is used to access the first argument inside a bash function?

A #1

B $1

C &1

D *1

$1 is the correct way to access the first argument inside a bash function.

If a function is called as func apple banana, what is $2 inside func?

A banana

B apple

C func

D empty

$2 is the second argument passed, which is banana.

Explain how to use $1 and $2 inside a bash function with an example.

Think about how you pass and use arguments in a function.

What happens if you try to use $1 inside a bash function but you did not pass any arguments when calling it?

Consider what $1 means when no argument is given.