Bash 101

Question 1

Print working directory

Answer 1

pwd

Question 2

Remove a folder and its files, forcibly

Answer 2

rm -rf filename

Question 5

In Less, go to the previous search term

Answer 5

N

Question 6

Modifier to make string searching case insensitive and recursive

Answer 6

-ri

Question 8

Go to the last directory you were in

Answer 8

Cd -

Question 9

&&

Answer 9

Perform both commands, but only the second if the first completed

Question 11

In Less, search

Answer 11

/

Question 13

Flag for listing files by reverse time modified

Answer 13

-rt

Question 16

Tab

Answer 16

Tab completion

Question 17

In Less, go to the next search term

Answer 17

n

Question 18

Run the last command again (specific)

Answer 18

!cmd

Question 20

Show running processes

Answer 20

ps

Question 22

Pipe character

Answer 22

Funnel the output to the command after the pipe, instead of STDOUT

Question 23

In Less, back or forward a page

Answer 23

^B

^F or space

Question 25

Erase from cursor to beginning of line

Answer 25

^ U

Question 26

Kill a process

Answer 26

Kill

Question 27

In Less, move to the beginning of the file

Answer 27

1G

Question 30

Move cursor to beginning of line

Answer 30

^ A

Question 31

In Less, quit

Answer 31

q

Question 32

In Less, move to the end of the file

Answer 32

G

Question 34

Flag for showing hidden files with ls

Answer 34

-a

Question 36

Remove a folder (no files in it)

Answer 36

Rmdir

Question 39

Search for a string matching the argument

Answer 39

grep

Question 40

Kill matching processes

Answer 40

pkill - -f

Question 41

Flag for showing human readable form with ls

Answer 41

-h

Question 42

Refer to the directory one level up

Answer 42

..

Question 43

Copy a file to new location

Answer 43

Cp

Question 44

Concatenate to the end of the file

Answer 44

Arg >> file.txt

Question 45

Refer to the current directory

Answer 45

.

Question 47

;

Answer 47

Perform both commands, regardless of whether the first was performed successfully

Question 48

Give the directory of a command (or check it exists)

Answer 48

Which

Question 50

Word count in lines, words and bytes

Answer 50

Wc

Question 54

Top

Answer 54

Show processes, sorted

Question 55

Move a file or rename it

Answer 55

Mv file1 file2

Question 56

Look for a file or directory

Answer 56

Find

Question 57

Run last command (any)

Answer 57

!!

Question 60

Create an empty file

Answer 60

Touch

Question 61

Head/tail

Answer 61

Look at the first/last 10 lines of a file

Question 63

Exit

Answer 63

^D

Question 65

Flag for showing long form with ls

Answer 65

-l

Question 66

See command history

Answer 66

History

Question 67

Download a file from the internet

Answer 67

Curl

Question 68

View the manual for a command

Answer 68

Man cmd

Question 73

Search through previous commands to find one

Answer 73

^R

Question 77

!n

Answer 77

Run the nth last command again

Question 79

Remove a file

Answer 79

Rm

Question 81

List files

Answer 81

ls

Question 82

Flag to forcibly, recursively remove files

Answer 82

-rf

Question 84

Clear screen

Answer 84

^ L

Question 85

Redirect operator

Answer 85

>

Question 90

Flag for showing directory content as well as names with ls

Answer 90

-d

Question 92

View the difference between two files

Answer 92

Diff

Question 94

Concatenate and print

Answer 94

Cat

Question 104

Move cursor to end of line

Answer 104

^ E