---
layout: page
category-page: scripts
category-title: Scripting
tags: command base echo cat grep
author: Dario Rasic
title: Script Base Commands
next-page: pages/scripts/1-variables.html
---
Echo
This command print as output its entire argument on the command-line.
It could be used with variables, like in the following example:
example="this is an example"
echo $example
this is an example
Cat
This command prints the content of a certain file as an output on the
command-line.
As example, we could imagine a simple text file in nano named "Hello", which contains
the line "Hello World".
So, our command example will look like this:
nano Hello
cat Hello
Hello World
Grep
This one behaves very similarly to the previus one, but in this case it prints only
the lines matching a certain pattern.
In this we could imagine a certain text file "animals", which contains a list of animal-names.
If we want to select only the animals whose name begins with the letter "d", we will write this:
grep "D" animals
Deer
Dragon
Dinosaur
Dog
Dolphin