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, takes you in and out of path you just pushed through

Question 8

popd

Answer 8

pop directory, takes the last directory you pushed into, and “pops” it off, taking you back to pre-pushing

Question 9

cp a.txt b.txt, cp a.txt directory/, and cp -r directoryx directoryy

Answer 9

copy a file or directory, can make copies of texts with new names, can make copies of texts into directories, and can copy directories into directories, which will include all files that were part of the pat

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 STARTDIR, the command is: -name “WILDCARD” - print…. and can | this to less

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

# Command Line Reverse print working directory

Answer 25

pwd

Question 26

# Command Line Reverse my computer's network name

Answer 26

hostname

Question 27

# Command Line Reverse make directory

Answer 27

mkdir

Question 28

# Command Line Reverse change directory

Answer 28

cd

Question 29

# Command Line Reverse list directory

Answer 29

ls

Question 30

# Command Line Reverse remove directory

Answer 30

rmdir

Question 31

# Command Line Reverse push directory

Answer 31

pushd

Question 32

# Command Line Reverse pop directory

Answer 32

popd

Question 33

# Command Line Reverse copy a file or directory

Answer 33

cp

Question 34

# Command Line Reverse move a file or directory

Answer 34

mv

Question 35

# Command Line Reverse page through a file

Answer 35

less

Question 36

# Command Line Reverse print the whole file

Answer 36

cat

Question 37

# Command Line Reverse execute arguments

Answer 37

xargs

Question 38

# Command Line Reverse find files, find STARTDIR, the command is: -name "WILDCARD" - print.... and can | this to less

Answer 38

find

Question 39

# Command Line Reverse find things inside files

Answer 39

grep

Question 40

# Command Line Reverse read a manual page

Answer 40

man

Question 41

# Command Line Reverse find what man page is appropriate

Answer 41

apropos

Question 42

# Command Line Reverse look at your environment

Answer 42

env

Question 43

# Command Line Reverse print some arguments

Answer 43

echo

Question 44

# Command Line Reverse export/set a new environment variable

Answer 44

export

Question 45

# Command Line Reverse exit the shell

Answer 45

exit

Question 46

# Command Line Reverse DANGER! become super user root DANGER!

Answer 46

sudo

Question 47

# Command Line Reverse change permission modifiers

Answer 47

chmod

Question 48

# Command Line Reverse change ownership

Answer 48

chown

Question 49

What does cat ex12.txt ex13.txt | less do?

Answer 49

The | takes the output from the command on the left, and "pipes" it to the command on the right.

Question 50

What does cat \< ex13.txt do?

Answer 50

The \< will take and send the input from the file on the right to the program on the left.

Question 51

What does cat ex13.txt \> ex15.txt do?

Answer 51

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

Question 52

What does \>\> do?

Answer 52

\>\> takes the output of the command on the left, then appends it to the file on the right.

Question 53

what does \* do?

Answer 53

matches anything in a wildcard like \*.txt

Question 54

what does rm \*.txt do?

Answer 54

removes all of the .txt files that are in the directory you are in

Question 55

what is a path?

Answer 55

a hierarchy of directories

Question 56

how do you get space in name, when creating a directory name?

Answer 56

you put quotes around it when naming it

Question 57

what is difference between cd.. and cd?

Answer 57

cd .. moves you up one level of path, while cd returns you to the home

Question 58

are directory names case sensitive?

Answer 58

yes

Question 59

what does ls -lR do?

Answer 59

it returns everything that is in path at each level, starting at the highest level

Question 60

what does mkdir -p i/like/icecream do?

Answer 60

it will make you this entire path

Question 61

what commands can you think of as stacks?

Answer 61

pushd and popd, you can also have multiple stacks that you can pushd and popd in between, pushd moves stacks and popd removes stacks, stack that is on inside of the command line in the one that you have open to write commands on

Question 62

what is the difference between touch and mkdir?

Answer 62

touch creates file while mkdir makes folder

Question 63

can you rmdir if the directory is not empty?

Answer 63

no