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POBASH Arithmetic Issues
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2012-04-10T01:48:16.327
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2012-04-10T02:32:30.063
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Body
I'm working in BASH and I'm having an idiot moment right now. I've got a project I'm working on that I'm going to need to use some very basic arithmetic expressions and I just realized that a lot of my problems with it are because my variables are not updating. So I threw together a basic algorithm that increments a variable by another variable with a while loop until a certain number is reached. <pre><code>counter=1 counter2=0 while [[ counter2 < 10 ]]; do counter2=$(($counter2+$counter)) echo $counter echo $counter2 done </code></pre> I run the script. Does nothing. I set the <code><</code> to <code>></code> just for kicks and an infinite loop occurs with a repeated output of: <pre><code>1 0 1 0 </code></pre> Forever and ever until I stop it. So it's obvious the variables are not changing. Why? I feel like such an idiot because it must be something stupid I'm overlooking. And why, when I have <code><</code>, it also isn't an infinite loop? Why doesn't it print anything at all for that matter? If <code>counter2</code> is always less than 10, why doesn't it just keep going on forever? Thanks folks in advance. EDIT: Well, I realize why it wasn't outputting anything for when the check is <code><</code>... I should have been using <code>$counter2</code> instead of just <code>counter2</code> to get the actual value of <code>counter2</code>. But now it just outputs: <pre><code>1 2 </code></pre> And that's it... I feel like such a derp.
Tags
<bash><arithmetic-expressions>
Title
BASH Arithmetic Issues
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1. COwhile [[ counter2 < 10 ]]; or while [[ $counter2 < 10 ]];
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