Command Line Basics

Question 1

What is a CLI? Command

Answer 1

Line Interface (text based application or operating system)

Question 2

What is a GUI? Graphical

Answer 2

User Interface (image based application or operating system)

Question 3

Give at least one use case for each of the commands listed in this exercise.

Answer 3

man - an interface to the on-line reference manuals

man is the system’s manual pager. Each
page argument given to man is normally
the name of a program, utility or function.

“man man”

Question 4

cat

Answer 4

concatenate files and print on the standard output

cat “file” (prints contents of file to screen)

Question 5

ls

Answer 5

List information about the FILEs

ls -a (do not ignore entries starting with .)

Question 6

pwd

Answer 6

print name of current/working directory

pwd > i-was-here.txt (write this file to current working directory)

Question 7

echo

Answer 7

display a line of text - writes strings in text file

echo ‘Hello, World!’ > hello.txt

Question 8

touch

Answer 8

change file timestamps

folder touch text adds file to folder

Question 9

mkdir

Answer 9

make directories

mkdir

Question 10

mv

Answer 10

move (rename) files

mv “file” (rename file)

Question 11

rm

Answer 11

remove files or directories

rm -r “file” (remove file and all contents)

Question 12

cp

Answer 12

copy files and directories

cp -r (copies files recursively)

Question 13

What are the three virtues of a great programmer?

Answer 13

laziness, hubris and