#ls –l
File / Folder listing in a specific directory
#id <user id>
To check if the user exists / also to find the
UID and groups of the existing user
#finger <user
id>
To check the user last login time stamp/ home
directory path / login shell / gecos field
#cat <file name>
To read the file which is less than 1 page
#less <file
name>
To read the file which is more than a page
#head <file
name>
To read the first 10 lines of the file
#tail <file
name>
To read the last 10 lines of the file
#hostname
To find the hostname of the logged in server
#uname
To find the flavor of unix OS
#uname –r
To find the kernel version
#uname -a
To find complete info of the server which
includes flavor, kernel OS build date
#which <command name>
To find the path of the command which needs to
be executed
#/usr/local/bin/sudo
/usr/sbin/useradd -u 7014 -g users -d /home/<login id>-m -c "Teju Nagaraj" -s /sbin/bash <login id>
Command to create a user in Linux server
#/usr/bin/sudo passwd <login
id>
Command to set password for a user
#/usr/bin/sudo
/usr/sbin/userdel <login id>
Command to delete the user without deleting home
directory
#/usr/bin/sudo
/usr/sbin/userdel -r <login id>
Command to delete the user including home
directory
#ssh <hostname>
Command to remotely login to a different server
#/usr/bin/sudo
/usr/sbin/usermod –c ”000/C///lastname, Firstname” <login id>
Command to modify the gecos filed of a user
#/usr/bin/sudo
/usr/sbin/usermod –s <shell name> <login id>
To change the shell of a user
