bash

Question 1

Exit the history search.

Answer 1

ctrl + g

Question 2

See the previous command in the history.

Answer 2

ctrl + p

Question 3

See the next command in the history.

Answer 3

ctrl + n

Question 4

Go to the beginning of the line in bash prompt

Answer 4

ctrl + a

Question 5

Go to the end of the bash prompt line

Answer 5

ctrl + e

Question 6

move cursor forward on bash prompt by 1 character

Answer 6

ctrl + f

Question 7

move cursor backward on bash prompt by 1 character

Answer 7

ctrl + b

Question 8

deletes forward to end of bash line

Answer 8

ctrl + k

Question 9

deletes backwards to beginning of bash line

Answer 9

ctrl + u

Question 10

delete backwards to the start of a word in bash prompt

Answer 10

ctrl + w

Question 11

delete the character under the cursor in the bash prompt

Answer 11

ctrl + h

Question 12

paste in the last item that you deleted or killed from the bash prompt, like when you ctrl + w, u, k, h, etc

Answer 12

ctrl + y

Question 13

count words in a file

Answer 13

wc -w file

Question 14

count lines in a file

Answer 14

wc -l file

Question 15

count characters in a file

Answer 15

wc -c file
or
wc -m file … if you want to take multi-byte character sets into account

Question 16

explain:

cat > trumpet &laquo_space;stop

Answer 16

this will change the terminal to input for the file “trumpet” and let you keep creating new lines of input until you type the word “stop” and press return. pretty cool, but I’m not sure why it works like it does lol

Question 17

How do you grep search all the files in a directory? (recursively)

Answer 17

grep -r

Question 18

how do you copy a directory of stuff?

Answer 18

cp -r

Question 19

show a calendar

Answer 19

cal

Question 20

show current date

Answer 20

date

Question 21

show disk usage in human readable format

Answer 21

df -h

f for filesystem? heh

Question 22

show disk usage of a file/folder but not the folders inside it

Answer 22

du -sh

u for underneath filesystem? heh

Question 23

show disk usage of a file/folder and the folders inside it

Answer 23

du -h

Question 24

how do you download a file with curl?

Answer 24

curl –output

Question 25

how do you download a file with wget and name it what you want

Answer 25

wget -o

Question 26

how do you download full page with wget

Answer 26

wget

Question 27

print process id of the current shell

Answer 27

echo $$

Question 28

print process id of the most recently invoked background job

Answer 28

echo $!

Question 29

display exit status of last command

Answer 29

echo $?

Question 30

read a string from input and assign it to a variable you could echo $variable out

Answer 30

read