BASH

Question 1

man

Answer 1

stands for manual, used to explain commands

Question 2

$ ls

Answer 2

list directory contents

Question 3

$ ls -l

Answer 3

use a long listing format

Question 4

$ ls -a

Answer 4

all - do not ignore entries starting with .

Question 5

$ ls -R

Answer 5

list all files and subdirectories recursively

Question 6

$ cd

Answer 6

change directory - move between folders

Question 7

% cd ..

Answer 7

return to previous directory

Question 8

% pwd

Answer 8

print working directory - shows you full path of your current location

Question 9

$ mkdir

Answer 9

make directory

Question 10

% touch

Answer 10

change file timestamps

Question 11

% touch -t 0402050000 new_file2.txt

Answer 11

change time of new_file2.txt to 05.02.04 instead of current time

Question 12

% touch -r file1 file2

Answer 12

change file2 timestamps to copy file1s

Question 13

% stat filename

Answer 13

can view access, modify, change, and birth info of file

Question 14

% nano

Answer 14

text editor - lets you create/edit text files

Question 15

% cp file1 file2

Answer 15

copy - copies content of file1 to file2

Question 16

% mv

Answer 16

move and rename files

Question 17

% mv desktop Desktop

Answer 17

will rename desktop as Desktop

Question 18

$rm / rmdir

Answer 18

remove file or remove directory

Question 19

shebang?

Answer 19

Very first line of a script

Question 20

!/usr/bin/env bash

Answer 20

starter for portable bash script

Question 21

echo “Hello World”

Answer 21

prints text to terminal

Question 22

Would a new file be allowed to run?

Answer 22

No - newly created files aren’t executable by default, need to give permission to run them

Question 23

chmod +x hello.sh

Answer 23

gives permission to run hello.sh

Question 24

./hello.sh

Answer 24

./ tells terminal to run hello.sh file

Question 25

$ printenv

Answer 25

prints environment variables

Question 26

read -p can read for user input

Answer 26

yeah