1, Windows system will automatically create several user accounts after installation, the Linux system also has a number of user accounts are there, just like the built-in Windows system after the system is installed in the same account.
2, they are used to complete a specific task, such as nobody and ftp, when we visited LinuxSir.Org page program, the official website of the server is to allow customers to 'nobody' logged (equivalent to Windows System anonymous account) ; when our anonymous access ftp, ftp will use the user or nobody.
3, first of all, nobody is a regular user, a non-privileged user. Use the nobody user name of 'purpose' is to enable anyone can log into the system, but its UID and GID does not provide any privilege that only have access to the uid and gid everyone can read and write files.
4. Second, many systems are routinely created by default to a nobody, as far as possible 'to limit its rights to a minimum', when the server service out, nobody could make client as a login.
5, nobody is a general account, because the default login shell is '/ sbin / nologin', so the user is not logged into the system directly, that is, hackers difficult to connect to your server to do damage through loopholes. In addition to the user's rights are also very low configuration. Therefore, there is a relatively high security. All rights only to a minimum. This is the meaning of existence nobody.