Install Linux & Basic Commands - Ch1

Question 1

List popular Linux distributions

Answer 1

Enterprise Linux:

• Red Hat Enterprise Linux (RHEL)
• Oracle Linux
• CentOS - Community Enterprise Oper Sys
• Scientific Linux
• Fedora
• Debian Linux: Comm pwrd, supports mult vendor hdwr
• Ubuntu Linux: Debian spinoff
• SUSE Linux: Commericial
• OpenSUSE Linux: Comm driven

Question 2

The Linux command prompt consists of what?

Answer 2

username
Linux system name
Current directory
Dollar sign $: default shell sign indicating a regular user
Centos command prompt is slightly different and enclosed within square brackets

Question 3

What is the basic syntax of the Linux command?

Answer 3

command;
option (switch);
argument (files & other data)

Question 4

A Linux command option is often preceded by what?

Answer 4

A hyphen

Question 5

ls

Answer 5

Lists files and directories

Question 6

pwd

Answer 6

Print working directory : Displays curr location in dir tree

Question 7

cd

Answer 7

Change dir

Question 8

cd /

Answer 8

Switch to the root dir

Question 9

cd -

Answer 9

Cmd switch to previous dir

Question 10

cd ..

Answer 10

Move up to parent dir

Question 11

tty

Answer 11

Cmd display terminal name you are currently running commands in

Question 12

uptime

Answer 12

Show sys curr time, how log it has been up, no of users logged in, avg no of processes over last 1, 5, and 15 min

Question 13

whoami

Answer 13

View user login name

Question 14

logname

Answer 14

Login name; shows name of real user originally logged in to sys

Question 15

id

Answer 15

Displays:
user id (UID);
user name;
group id (GID);
secondary group ids

Question 16

groups

Answer 16

Lists all groups a user is a member of

Question 17

uname

Answer 17

Displays OS name.

Question 18

uname -a

Answer 18

Display OS name with details

Question 19

hostname

Answer 19

Display system hostname;

Ex… centos73

Question 20

clear

Answer 20

Clears terminal screen

Question 21

gzip

Answer 21

Creates a compressed file of each specified files;
Adds .gz extension to each file;
Faster with compression ratio, but not as good as bzip2

Question 22

gzip options;

• r
• l

Answer 22

-r
Compresses entire directory tree

-l
Instructs the command to display uncompressed filename

Question 23

gunzip

Answer 23

Used to decompress .gz files;

Can also use gzip -d to decompress;

Question 24

bzip2

Answer 24

Creates compressed file of each specified file;

Adds bz2 extension

Question 25

bzunzip2

Answer 25

Decompresses bzip2 compressed files

Question 26

xz

Answer 26

Compress files with better compression ratio, but slower than gzip or bzip2;
Adds .xz extension to compressed files

Question 27

unxz

Answer 27

Uncompress files compressed with xz;

Can also use xz -d to uncompress

Question 28

tar

Answer 28

Tape archive;

Create, append, update, list and extract files or dir tree to form a single tar file

Question 29

man

Answer 29

View manual pages

Question 30

man -k

Answer 30

Search man pages for keyword following -k

Question 31

–help

Answer 31

Display man pages of command following “–help “

Question 32

whatis

Answer 32

Display short description of a command or file in man database

Question 33

cpio

Answer 33

Copy in/out;

Copy, list and extract files to and from a single archive file