Shell Commands

Question 1

pwd

Answer 1

print working directory

Question 2

hostname

Answer 2

my computer’s network name

Question 3

mkdir
mkdir “name with space”
mkdir -p stuff/things/orange/apple/pear/grape/

Answer 3

make directory

Question 4

cd
cd ..
cd ../../../

Answer 4

change directory

Question 5

ls

ls -a

Answer 5

list directory

list directory with invisible files

Question 6

rmdir

rm -rf (to remove directory that is not empty)

Answer 6

remove directory

Question 7

pushd

Answer 7

push directory
(takes your current directory and "pushes" it into a list for later, then it changes to another directory. It's like saying, "Save where I am, then go here.")
(swaps directories is donw without named directory)

Question 8

popd

Answer 8

pop directory

takes the last directory you pushed and “pops” it off, taking you back there.

Question 9

cp

cp -r to copy more directories with files in them.

Answer 9

copy file or directory

will overwrite so be careful

Question 10

mv

Answer 10

rename a file or directory

Question 11

less

Answer 11

page through a file

q to quit; space and w to page thru, or arrow keys

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

apropros

Answer 17

find which 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

Question 23

touch

touch iamcool.txt

Answer 23

create a new empty file

Question 24

1. rm

2. rm -rf

Answer 24

1. remove a file

2. remove a directory with files in it