Bash 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

Question 15

grep

Answer 15

find things inside files

Question 16

man

Answer 16

read a manual page

Question 17

apropos

Answer 17

find what man 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

S|$

Answer 25

takes the output from command on left and pipes it to command on right

Question 26

$<$

Answer 26

takes and sends the input on right to program on left

Question 27

$>$

Answer 27

takes output of command on left and writes it to the file on right

Question 28

$»$

Answer 28

Takes the output of command on left, then appends it to the file on right

Question 29

*

Answer 29

matches anything in a wildcard like “*.txt”

Question 30

find format

Answer 30

find STARTDIR -name WILDCARD -print