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git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@289 a672b425-5310-4d7a-af5c-997e18724b81
66 lines
1.9 KiB
HTML
66 lines
1.9 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<link rel="stylesheet" type="text/css" href="mystyle.css">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="keywords" content="loops, while, unix, shell">
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<meta name="author" content="Aleksandar Todorovic">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>while|loops</title>
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</head>
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<body>
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<header>
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<div class="nav">
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<ul>
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<li><a href="index.html">home</a></li>
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<li><a href="index_if.html">if</a>
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<ul>
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<li><a href="if.html"></a>if-fi</li>
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<li><a href="if-else.html"></a>if-else</li>
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<li><a href="elif.html"></a>if-elif</li>
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</ul>
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</li>
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<li><a href="loops_index.html">Loops</a>
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<ul>
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<li class="current"><a href="while.html"></a>while</li>
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<li><a href="for.html"></a>for</li>
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</ul>
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</li>
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</ul>
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</div>
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</header>
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<div class="syntax">
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<h2>syntax of While Loops</h2>
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<P>#!/bin/sh <br>
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while [ comand ] <br>
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do <br>
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statement to be exeuted if command is true <br>
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done <br>
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</P>
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<h2>Exemple</h2>
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#!/bin/sh <br>
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INPUT_STRING=hello <br>
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while [ "$INPUT_STRING"!="bye" ] <br>
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do <br>
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echo "please type something in (bye to quit) <br>
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read INPUT_STRING <br>
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echo "You typed: $INPUT_STRING" <br>
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done <br>
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<h3>Explanation</h3>
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<P>In this exemple "echo" and read statement run will go forward until we type "bye" <br>
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Normaly "while" command execute a code if this expression code is true, and stop only when is false or when say (type) stop.</P>
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</div>
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<footer>
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<h4>Source</h4>
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<ul>
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<li>https://www.shellscript.sh/loops.html</li>
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<li>https://www.autistici.org/loa/shodan/corsounix.pdf</li>
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<li>https://www.guru4technoworld.wix.com</li>
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</ul>
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</footer>
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</body>
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</html>
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