Command Line

Question 1

> &&raquo_space;

Answer 1

makes/overwrites file for output vs. appends output if file exists

Question 2

man

Answer 2

read a manual page

Question 3

grep

Answer 3

find things inside files

Question 4

|

Answer 4

output of command on LEFT as input to command on RIGHT

Question 5

export

Answer 5

export/set a new environment variable

Question 6

echo

Answer 6

print some arguments

Question 7

env

Answer 7

look at your environment

Question 8

apropos

Answer 8

find what man page is appropriate (search though man pages)

Question 9

find

Answer 9

find files (find STARTDIR -name WILDCARD -print)

Question 10

cat

Answer 10

print whole file to standard output

Question 11

pwd

Answer 11

print working directory

Question 12

hostname

Answer 12

my computer’s working name

Question 13

mkdir

Answer 13

make directory

Question 14

cd

Answer 14

change directory

Question 15

ls

Answer 15

list directory (contents)

Question 16

rmdir

Answer 16

remove directory

Question 17

pushd

Answer 17

push directory

Question 18

popd

Answer 18

pop directory

Question 19

cp

Answer 19

copy a file or directory

Question 20

mv

Answer 20

move (rename) a file or directory

Question 21

less

Answer 21

page through a file

Question 22

xargs

Answer 22

execute arguments

Question 23

sudo

Answer 23

!DANGER! become a super user root !DANGER!

Question 24

exit

Answer 24

exit the shell

Question 25

chmod

Answer 25

change permission modifiers

Question 26

chown

Answer 26

change ownership

Question 27

sort

Answer 27

sort contents

Question 28

head

Answer 28

first line(s) of a file, where default is 10

Question 29

tail

Answer 29

last line(s) of a file, where default is 10

Question 30

wc

Answer 30

word count

Question 31

touch

Answer 31

create empty file