To provide interoperability on the Internet, the hostname should conform to RFC 952, DOD Internet Host Table Specification. Several initialization files are associated with each user account home directory. These files are used to specify commands to be executed when the associated event occurs. Depending on the login shell being used, there might be a login initialization file, a shell startup file, or a logout file. Commands in the login initialization file are executed when the user logs in.
All common shells provide a login initialization file.
Commands in the shell startup file are executed whenever the logged-in user starts a shell. The cooperative communication between processes. The IP address consists of four numbers between 0 and 255 and typically is written in dotted decimal notation, such as 192.168.99.27. The IP addresses are grouped into five network classes on the basis of the value of the first octet. A collection of software that manages the physical and logical resources of a computer.