3. Linux commands

who

• Login name of user
• Date and time of login
• remote host name of user

whoami

• Display system's username

id

• Displays user identification (real and effective group ids)

groups

• Displays the groups for which user belongs

Ways to become sudo user in Linus OS

1. sudo -i
2. sudo -s
3. sudo su -
4. su -root
5. su -

users

• Displays username of all users currently logged in

clear

lastlog

• detail of recent logged in user

File and Directory commands:

pwd

• present working directory

ls

• list directories

mkdir

• create directory

rmdir

• remove directory

-p : refers for parent
-v : verbose output for the processed direct

touch

• create file

/ root diretory
~ home directory

Installing packages
yum install package_name

Info about package
yum info package_name

Remove package
yum remove package_name

Installing package from a localfile
./filename

Disk usage command
du pathofdirectory

• find out disk usage summary

du -h pathofdirectory

• bring info in human readable format

du -sh nameofdirectory

• find out total disk usage

ah -sh nameofdirectory

System and hardware information

uname -a

• all user

uname -s

• know kernel name

uname -r

• release of kernel

uname -m

• print architecture

uname -o

• print operating system name