All you want to know about Linux Shell Environment

Have you ever thought that how can you run a standard command line utility(for example : cp) from any directory in the shell irrespective of it’s presence in that directory? How does the shell know where the executable is present and whether it is present at all? These questions might confuse someone who is new to the concept of Linux shell environment. So, in this article we will discuss the concepts related to Linux shell environment and how it is related to Linux command line utilities and other programs.