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<div class="syntax">
<h2>syntax of first case</h2>
<P>if [ expresion 1 ] <br>
then <br>
statement to be executed if expresion 1 is true <br>
elif [ expression 2 ] <br>
then <br>
statement to be executed if expresion 2 is true <br>
elif [ expression 3 ] <br>
then<br>
statement to be executed if expresion 3 is true <br>
else <br>
statement to be executed if no expresion is true <br>
fi <br>
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<h3>Explanation</h3>
<P> On can use this command (expression) if we want select one of many blocks of code to execute. <br>
It check one by one the expression and when is true it execute the statement and goes to next. <br>
But if the expressions are false then it enters into else block and execute the else statement
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<h2>Exemple</h2>
<P>#!/bin/sh <br>
var1=10 <br>
var2=10 <br>
if[ var1==1var2 ] <br>
then <br>
echo "var1 is equal var2" <br>
elif [ $var1 -gt $var2 ] <br>
then <br>
echo "var1 is greater than var2"<br>
elif [ $var1 -lt $var2 ] <br>
then <br>
echo "var1 is not equal var2"<br>
else <br>
echo "none of the condition is ok"<br>
fi <br>
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<h4>Source</h4>
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<li>https://www.shellscript.sh/loops.html</li>
<li>https://www.autistici.org/loa/shodan/corsounix.pdf</li>
<li>https://www.guru4technoworld.wix.com</li>
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