execFile for running executables in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of execFile in Node.js?

execFile runs an executable file directly without a shell. It is used to start programs or scripts safely and efficiently.

intermediate

How does execFile differ from exec in Node.js?

execFile runs a file directly without a shell, making it safer and faster. exec runs commands inside a shell, which can be slower and riskier due to shell injection.

beginner

What arguments does execFile accept?

execFile accepts: the file path, an optional array of arguments, an optional options object, and a callback function to handle results.

beginner

What does the callback function of execFile receive?

The callback receives three arguments: error (if any), stdout (standard output), and stderr (standard error output).

intermediate

Why is execFile considered safer than exec?

Because execFile runs the executable directly without a shell, it avoids shell command injection risks and unexpected shell behavior.

Which Node.js method runs an executable file directly without a shell?

A fork

B exec

C execFile

D spawn

execFile runs executables directly without a shell, unlike exec which uses a shell.

What is the first argument to execFile?

A The executable file path

B An array of arguments

C A callback function

D An options object

The first argument is the path to the executable file you want to run.

What does the callback of execFile NOT receive?

A Process ID

B Error object

C Standard error output

D Standard output

The callback receives error, stdout, and stderr, but not the process ID.

Why might you choose execFile over exec?

A To run shell commands

B To avoid shell injection risks

C To run JavaScript code

D To debug Node.js code

execFile avoids shell injection by not using a shell.

Which of these is a valid way to pass arguments to execFile?

A In the options object only

B As a string concatenated to the file path

C Inside the callback function

D As an array after the file path

Arguments are passed as an array right after the executable file path.

Explain how to use execFile to run an executable with arguments and handle its output.

Think about the order of arguments and what the callback receives.

Describe why execFile is safer than exec when running external programs.

Consider how shell commands can be risky.