Common Linux Command

Question 1

report a snapshot of the current processes.

Answer 1

ps command

Question 2

locate a command

Answer 2

which command
- look in the directories listed in the users’ search path for the required file

Question 3

determine file type

Answer 3

file command

• find out more about the kind of data

Question 4

print lines that match patterns

Answer 4

grep command

eg

grep -rnw ‘/path/to/somewhere/’ -e ‘pattern’

(find all files containing specific text on Linux)

Question 5

print real and effective user and group IDs

Answer 5

id command

Question 6

search for files in a directory hierarchy

Answer 6

find command

format:

find -name

eg.

find / -iname “bash*”

Question 7

output the first part of files

Answer 7

head command

eg.

head -10 bash.bashrc

Question 8

change file mode bits

Answer 8

chmod command

Question 9

output the last part of files

Answer 9

tail command

eg

tail -10 bash.bashrc

PS.

-f(–follow) is often used by system administrators to file respectively

Question 10

send a signal to a process

Answer 10

kill command

Question 11

an archiving utility

Answer 11

tar command

Question 12

list directory contents

Answer 12

ls command
eg.

ls -a

ls -a

ls -latr

Question 13

OpenPGP encryption and signing tool

Answer 13

gpg command

Question 14

display a tree of processes

Answer 14

pstree command