Some command in Linux

$sudo su To connect root
$pwd To Find out present working directory
$who, $who am i To Find out current user
$w To find out all user
$uptime When the system was restarted
$touch Used to create empty file
$touch file1 file2 file3 To create Multiple empty files
$touch file{1--100}.txt Create Multiple file using wild card character
$mkdir -p newdelhi1/newdelhi2/newdelhi3 Create directory Recurssively
$sudo passwd To Change the password
$sudo adduser to create a new user