If you are still using sendmail software in system, Open your host allow file and add the below line,

Set the ownership and permission for a file using chown and chmod command, If you want to Clone ownership and permissions from another file.

Unfortunately if you have changed files and directories permission to 777. You can not reset root password and logged into user account including graphically.

If you may received an error when you mount external hard disk, mount you must specify the filesystem type.

Assume that, if you are working in Data Center or running your application in VPS server, we can change static IP Address without downtime and reboot your Server.

SAR command is collect and report system activity in the operating system, easily to get system status number of times spaced at the specified intervals in seconds. Analysis of load values of different sub-system process like, CPU, Network interface, Memory Usage, Load and etc.

Samba server is an open source package very helpful to connect and access windows based files and printer shares. Samba implementation of the Server Message Block protocol.