Birmingham mumbai

[
 132 
]
Input and output streams
During our journey into Ubuntu Server so far, we've worked quite a bit within the 
terminal. We've been able to inspect the contents of files, insert text into files, and 
more. We've actually been working with 
streams
 the entire time without knowing it. 
In this section, we're going to talk about this subject in more detail.
If you've studied computer science at all, then you probably already know that 
output
 refers to things that are printed out of the computer (for example, text being 
printed to the screen, or onto paper from a printer) and 
input
 refers to data that is 
being entered into a computer, whether that be on the command line, into a file, or 
similar.
Linux takes this concept a bit further. Streams in Linux refer to a special way to 
handle what's going in or out, and beyond the input and output streams, we also 
have a third that refers to errors.
Output streams in Linux are referred to as 
Standard Output
, and input streams 
are referred to as