Command

Line

Created by Luis Ibanez

Command

Line

Communicating

with a

Computer

You just logged in the server:

Welcome to the Real World !

Type:

clear

to clear the screen.

Now, you see this:

Type:

whoami

to see your username.

Type

date

to see the day and time.

Type

who

to see what other users are logged in,

and from where they are connected.

Type

clear

to clear the screen.

Think:Tree !

Think:Tree !

Files

are organized

in directories

Directories

are organized into

more directories

Directories

form

a tree

Like this one

Type

ls

to get a list of files and directories.

It will be empty in your initial account.

Type

mkdir Music

to create a new directory called "Music"

Then use "ls" to see the directory.

Enter the Music directory with the command

cd Music

Then use "mkdir" to create more Directories

and use "ls" to see those directories.

mkdir Jazz
ls
mkdir Rock
ls
mkdir HipHop
ls
mkdir Rap
ls
mkdir Country
ls

Like this:

Enter the Jazz directory with the command

cd Jazz

Then use "mkdir" to create more Directories

and use "ls" to see those directories.

mkdir BillEvans
ls
mkdir StanGetz
ls
mkdir LouisArmstrong
ls
mkdir EllaFitzgerald
ls
mkdir MillDavis
ls

Like this:

Enter the LouisArmstrong directory with the command

cd LouisArmstrong

Then use "mkdir" to create more Directories

and use "ls" to see those directories.

mkdir TheGreatSummit
ls
mkdir TheRealAmbassadors
ls
mkdir SatchmoInStyle
ls
mkdir EllaAndLouis
ls
mkdir PorgyAndBess
ls

Like this:

Go back to the parent directory with the command

cd ..

Then use "ls" to see the directories.

ls

Then use "pwd" to see where you are.

pwd

"pwd" stands for "Print Working Directory".

Then

Do it

Again

Go back to the parent directory with the command

cd ..

Then use "ls" to see the directories.

ls

Then use "pwd" to see where you are.

pwd

"pwd" stands for "Print Working Directory".

Like this:

Your

Turn !

Go to the

"Music"

Directory

Create a Directory

for your favorite

Genre

Enter that Directory

And Create Directories

for your three favorite artists

Enter the Directory of your favorite artist

And Create Directories

for your three favorite albums

Breath!

Smile!

Time to

Travel

Think of a Country and City

that you would like to visit

if someone else is paying for the trip.

Go to the shared directory

cd /INF202World

See the available directories

ls

Enter the Directory

of your destination continent

See what Directories

already exist for countries

Create a Directory

for your destination country

Give permissions

For others to enter this country

chmod 777 countryname

Where "countryname" should be replaced with the actual name of your destination country"

Enter the Directory

of your destination country

See what Directories

already exist for cities

Create a Directory

for your destination city

Give permissions

For others to enter this city

chmod 777 cityname

Where "cityname" should be replaced with the actual name of your destination city."

Enter the Directory

of your destination city

Leave your mark !

with the command

echo "John Doe"  >>  visitors.txt

but of course, use your own name

Check the result

with the command

cat visitors.txt

You should see your own name.

Give permissions

For others to leave their mark too

chmod 777 visitors.txt

Time to

Find Others

Command Hints

Go to parent directory

cd ..

List directory content

ls

Go to sub-directory

cd directoryname

See content of file

cat visitors.txt

Your Mission

• Navigate the directory tree
• See the content of visitors.txt files
• Find 10 people in different cities
• Write report

Ray Grigg