Basic Commands

Question 1

pwd

Answer 1

Print working directory

Question 2

hostname

Answer 2

My computer’s network name

Question 3

mkdir

Answer 3

Make directory

Question 4

cd

Answer 4

Change directory

Question 5

ls

Answer 5

List directory

Question 6

rmdir

Answer 6

Remove directory

Question 7

pushd

Answer 7

Push directory

Question 8

popd

Answer 8

Pop directory

Question 9

cp

Answer 9

Copy a file or directory

Question 10

mv

Answer 10

Move a file or directory

Question 11

less

Answer 11

Page through a file

Question 12

cat

Answer 12

Print the whole file

Question 13

xargs

Answer 13

Execute arguments

Question 14

find

Answer 14

Find files

find start directory -name pattern -print

Need to double quote the pattern

Question 15

grep

Answer 15

Find things inside files

Question 16

man

Answer 16

Read a manual page

Question 17

apropos

Answer 17

Find which manual page is appropriate

Question 18

env

Answer 18

Look at your environment

Question 19

echo

Answer 19

Print some arguments

Question 20

export

Answer 20

Export/set a new environment variable

Question 21

exit

Answer 21

exit the shell

Question 22

sudo

Answer 22

DANGER! become super user root DANGER!

Question 23

chmod

Answer 23

Change permission modifiers

Question 24

chown

Answer 24

Change ownership

Question 25

LHS | RHS

Answer 25

Take the output of the command on the LHS and pipe it in as the input for the RHS

Question 26

LHS < RHS

Answer 26

Use RHS as the input for LHS

Question 27

LHS > RHS

Answer 27

Put the output of LHS into RHS

Question 28

LHS&raquo_space; RHS

Answer 28

Append the output of LHS to RHS (doesn’t overwrite RHS)

Question 29

.

Answer 29

the working directory

Question 30

..

Answer 30

Parent of the working directory