af40908294
git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@254 a672b425-5310-4d7a-af5c-997e18724b81
55 lines
1.2 KiB
HTML
55 lines
1.2 KiB
HTML
---
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layout: page
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category-page: scripts
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category-title: Scripting
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tags: command base echo cat grep
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author: Dario Rasic
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title: Script Base Commands
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next-page: pages/scripts/1-variables.html
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---
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<!-- Echo command text -->
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<h3>Echo</h3>
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<p>This command print as output its entire argument on the command-line.<br>
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It could be used with variables, like in the following example:<br>
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<pre>
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example="this is an example"
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echo $example
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this is an example
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</pre>
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<!-- Cat command text -->
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<h3>Cat</h3>
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This command prints the content of a certain file as an output on the
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command-line.<br>
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As example, we could imagine a simple text file in nano named "Hello", which contains
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the line "Hello World".<br>
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So, our command example will look like this:<br>
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<pre>
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nano Hello
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cat Hello
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Hello World
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</pre>
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<!-- Grep command text -->
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<h3>Grep</h3>
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This one behaves very similarly to the previus one, but in this case it prints only
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the lines matching a certain pattern.<br>
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In this we could imagine a certain text file "animals", which contains a list of animal-names.
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If we want to select only the animals whose name begins with the letter "d", we will write this:<br>
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<pre>
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grep "D" animals
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Deer
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Dragon
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Dinosaur
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Dog
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Dolphin
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</pre>
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