Learn Linux Shell Scripting - Fundamentals of Bash 4.4

/bin/, /sbin/, and /usr/

Let's get back to top-level directories. We'll discuss /bin/, /sbin/, and /usr/ first, because they are really similar. As stated in the overview, all of these directories contain binaries used by normal users and administrators of the system. Let's see where those binaries are and how our user session knows how to find them in the process. We'll manage this by using the echo command. Its short description is simply display a line of text. Let's see how it works:

reader@ubuntu:~$ echoreader@ubuntu:~$ echo 'Hello'Helloreader@ubuntu:~$

If we use echo without passing an argument, an empty line of text is displayed (pretty much just as promised by the short description!). If we pass text, which we enclose in single quotes, ...