1. df :-

Display statistics about the amount of free disk space on the specified file_system or on the file system of which file is a part

>df(free disk space size)

>df -a

2. nslookup :-

Query the nameserver for the IP address of the given HOST optionally using a specified DNS server.

>nslookup

>nslookup akashranjanpatel.club(find ip address)

3. chmod:-

chmod is the command and system call which is used to change the access permissions of file system objects.Grant Full permission to the file

>cmod 777 *(Grant read/write permission)

4. netstat:-

Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships

>netstat

>netstat -l (display listening server packets)

5. ifconfig :-

Configure network interface parameters

>ifconfig (Show host networks device information)