Linux Commands

Question 1

Command to list directory contents?

Answer 1

ls [options]

Question 2

Command to create a new directory?

Answer 2

mkdir [options] [directory name]

Question 3

Command to change to a directory?

Answer 3

cd /[directory path]

Question 4

Command to copy files and directories?

Answer 4

cp [options] [source] [destination]

Question 5

Command to display a file’s content to the standard output device (usually your monitor)?

Answer 5

cat [filename]

Question 6

Command to change a file’s permission?

Answer 6

chmod [options] mode [filename]

Question 7

Command to change a file’s owner?

Answer 7

chown [options] filename

Question 8

Command to clear a command line screen/window for a fresh start?

Answer 8

clear

Question 9

Command to display or set the system date and time?

Answer 9

date [options]

Question 10

Command to display used and available disk space?

Answer 10

df [options]

Question 11

Command to determine how much space each file takes up?

Answer 11

du [options]

Question 12

Command to determine what type of data is within a file?

Answer 12

file [options] [filename]

Question 13

Command to search for files matching a provided pattern?

Answer 13

find [pathname] [expression]

Question 14

Command to search files or output for a particular pattern?

Answer 14

grep [options] pattern [filename]

Question 15

Command to stop a process?

Answer 15

kill [options] pid

Note:
If a process refuses to stop, use “kill -9 pid”

Question 16

Command to view the contents of a file one page at a time?

Answer 16

less [options] [filename]

Question 17

Command to create a shortcut?

Answer 17

ln [options] [source] [destination]

Question 18

Command to search a copy of your file system for the specified filename?

Answer 18

locate [filename]

Question 19

Command to send a print job?

Answer 19

lpr [filename]

Question 20

Command to display information for a specified command?

Answer 20

man [command]

Question 21

Command to rename or move file(s) or directories?

Answer 21

mv [options] [source] [destination]

Question 22

Command to allow system administrator to change any password?

Answer 22

passwd [name] [new password]

Question 23

Command to display a snapshot of currently running processes?

Answer 23

ps [options]

Question 24

Command to display the pathname for the current directory?

Answer 24

pwd

Question 25

Command to remove (delete) files and/or directories?

Answer 25

rm [options] [directory or filename]

Question 26

Command to delete empty directories?

Answer 26

rmdir [options] [directory]

Question 27

Command to remotely log into another Linux server, over the network?

Answer 27

ssh [options] [user]@[hostname]

Note:
To leave an SSH session type “exit”

Question 28

Command to switch to another user account?

Answer 28

su [options] [user[arguments]]

Question 29

Command to display the last n lines of a file (default is 10)?

Answer 29

tail [options] [filename]

Question 30

Command to store and extract files from a tarfile (.tar) or tarball (.tar.gz or .tgz)?

Answer 30

tar [options][filename]

Question 31

Command to display the resources being used on your system?

Answer 31

top

Note:
Press “q” to quit

Question 32

Command to create an ampty file with a specified filename?

Answer 32

touch [filename]

Question 33

Command to display who is logged onto the system?

Answer 33

who [options]

Question 34

Command to stop a service?

Answer 34

service [servicename] stop

Question 35

Command to start a service?

Answer 35

service [servicename] start

Question 36

Command to restart a service?

Answer 36

service [servicename] restart

Question 37

Command to display server uptime?

Answer 37

uptime

Question 38

Command to display the status of a service

Answer 38

service [servicename] status