User and Group IDs In Unix

When you execute a program, you create a process. Four identifiers are assigned to this process upon its creation. These are its real uid, real gid, effective uid, and effective gid. File access for a…

5 Likes Comment

Unix Password File

Most UNIX variants keep information about users in two files, /etc/passwd and /etc/shadow. These files are used by the login program to authenticate users and to set up their initial work environment. All users can…

3 Likes Comment

Why Is UNIX Important?

During the past 35 years, the operating system known as UNIX has evolved into a powerful, flexible, and versatile operating system. The different variants of UNIX conform to a variety of standards and are closely…

6 Likes Comment