Command line

Question 1

What is a CLI?

Answer 1

The command line interface is for the user, or me.

Question 2

What is a GUI?

Answer 2

Graphic User Interface manipulated with buttons, interfaces for the user.

Question 3

man
cat

Answer 3

Manual for the commands in the CLI.
Cat displays the content of a chosen file in your terminal. But it is used for joining and combining files.

Question 4

ls
pwd

Answer 4

ls allows you to see the files in your current directory
pwd prints the current directory you are in

Question 5

echo
touch

Answer 5

Repeats a string within the terminal but is used to add typed characters within a created fines.
Touch changes the timestamp meaning that if it does not exist it creates an empty file.

Question 6

mkdir
mv

Answer 6

mkdir makes directories (for making subfolders)
mv moves or rename files in directories (moving files or copying to a different directory)

Question 7

rm
cp

Answer 7

rm removes a chosen directory or file (-r and -f but -i for interactive)
cp copies the file into the same directory if not specified.

Question 8

What is Node.js?

Answer 8

An asynchronous event-driven javascript runtime, outside of the browser

Question 9

What can node.js be used for?

Answer 9

It can run utilities and other programs in the backend as it does not require the browser. Write web, application, desktop programs, mobile apps, any general progr1am that allows you to use node run time but embedded programming does not have enough power.

Question 10

What is a REPL?

Answer 10

Read Evaluate Print Loop.
Its a system acronym waiting for you to type command and it processes and waits for new command.
Read received program, evaluate, it prints it, then loops waiting for the next command.

Question 10

What is a computer process?

Answer 10

Set of process run by the computer. An environment to which your program runs CPU memory, and multiple processes running like application which may be an even smaller processes. envirnment of code.

Question 11

Why should a full stack web dev know that computer processes exist

Answer 11

Too many processes will crash the pc, knowing which are running (dev server, database), so you can kill them.

Question 12

What is a process object in a node.js program?

Answer 12

Process object is a global object injected during runtime

Question 13

How do you access the process object in a Node.js program

Answer 13

It is accessed by simply inputing process

Question 14

What is the data type of process.argv in node.js

Answer 14

It is an array of strings

Question 15

What is a javascript module?

Answer 15

It is essentially a file that can be accessed either by the main file or other modules to be used through export.

Question 16

Give two examples of truly global variables in a Node.js program.

Answer 16

required, __dirname, __filename, exports, module.

Question 17

What values are passed into a Node.js module’s local scope?

Answer 17

required, __dirname, __filename, exports, module.

Question 18

What is the purpose of module.exports in a Node.js module?

Answer 18

It acts like the return statement of the file referenced by the require statement. You export the function from the different files.

Question 18

How do you import functionality into a Node.js module from another Node.js module?

Answer 18

utilizing the required function from the modules’ module.exports.

Question 19

what is the event loop?

Answer 19

Mechanism for asynchronous code. The event loop is code that the system manages execution. It has takes off queue and executes, takes off queue and executes.

Question 20

what is a directory

Question 21

what is a relative file path

Question 22

what is an absolute file path