codes

Question 1

displays file contents onscreen or provide file contents to standard output

Answer 1

cat FILENAME

Question 2

display files 1 and 2

Answer 2

cat FILE1 FILE2

Question 3

return to home directory

Answer 3

cd

Question 4

move up one level in the directory tree

Answer 4

cd ..

Question 5

move to the /etc directory relative to the system root

Answer 5

cd /etc

Question 6

use a tilde as a shortcut to get to your home directory, this moves you to the subdirectory

Answer 6

cd ~/subdir

Question 7

move to the Projects directory relative to the current directory

Answer 7

cd Projects

Question 8

Filter backspaces and reverse line feeds out of input. Use to make man pages editable without odd formatting

Answer 8

col -b

Question 9

Close your current process (often a shell) and your Unix session if you close the login shell

Answer 9

CTRL D

Question 10

close your current shell and your Unix session if you are in login shell

Answer 10

exit

Question 11

Use to view Filename screen by screen

Answer 11

less Filename

Question 12

close your Unix session

Answer 12

logout

Question 13

list files and directories

Answer 13

ls

Question 14

list the files and directories in the root directory

Answer 14

ls /

Question 15

list the files and directories in a directory

Answer 15

ls directoryname

Question 16

list all files and directories, including hidden ones

Answer 16

ls -a

Question 17

list files and directories by modification date

Answer 17

ls -c or ls -t

Question 18

list files and directories in long format, with extra information

Answer 18

ls -l

Question 19

list files and directories in long format, with extra information and human readable sizes

Answer 19

ls -lh

Question 20

view the specified section (5) of the man pages for command. Sometimes used a man -s 5 Command

Answer 20

man 5 command

Question 21

view the manual (help) pages for command

Answer 21

man command

Question 22

find appropriate man pages for “keyword”

Answer 22

man -k keyword

Question 23

view filetoview screen by screen

Answer 23

more filetoview

Question 24

change your password

Answer 24

passwd

Question 25

display the path and name of the directory you are currently in

Answer 25

pwd

Question 26

reset the shell to fix display problems

Answer 26

reset

Question 27

try to fix unexpected, sudden and strange display problems

Answer 27

stty sane

Question 28

Re-log in without having to log out

Answer 28

su -yourid

Question 29

become the root user

Answer 29

su

Question 30

run a command with the authority of root user

Answer 30

sudo commandname

Question 31

copy existingfile to a file named newfile

Answer 31

cp existingfile newfile

Question 32

copy existingfile to a file named newfile, prompting you before overwriting existing file

Answer 32

cp -i existingfile newfile

Question 33

copy the directory /Projects to the new name /shared/Projects, specifying recursive copy

Answer 33

cp -r /Projects /shared/Projects