3.01

linux has super user account called

root

linux is

• case sensitive, file ABC is not the same as file abc

when creating files avoid using

spaces

linux kernel is

Not an operating system, it is a small software that takes commands from users and passes them to system hardware

2 types of access

console

• remote

command to remotely access linux machine

• ssh 192.168.1.1

command to remote into linux machine with username

• ssh -l <username> <ip-address>

get ip address

ip addr

command prompt order

username - hostname - prompt symbol

get prompt back

ctrl + c

get username

whoami

get hostname

hostname

there are 3 types of root on a linux system

• root account → has access to all commands

• / → root directory

• /root → root home directory

change password

passwd userid

linux file systems

ext3, ext4, xfs

go to a different directory

cd

directory where log files are located

/var

directory where commands are located

/sbin

directory that contains files used by bootloader

/boot

directory that contains root user home directory

/root

directory that contains configuration files

/etc

directory that contains system devices

/dev

directory that contains everyday user commands

/usr/bin

directory that contains system file commands

/usr/sbin

directory that contains optional add ons

/opt

directory that contains running processes used only in memory

/proc

directory that contains programming library files

/usr/lib

directory that contains temporary files

/tmp

directory that contains system logs

/var

switch directories

cd

find which directory you are currrently in

pwd

list the contents of a file

ls <filename>

c: drive (windows) is the same as what in linux

/

become root

su -

wipe the screen

clear

when doing ls… anything that starts with - is a

file

when doing ls… anything that starts with d is a

directory

go one directory back

cd ..

when doing ls… anything that starts with l is a

link

an absolute path always begins with

/