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POHow to perform calculation over a log file
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  1. POHow to perform calculation over a log file
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    copied!<p>I have a that looks like this:</p> <pre><code>I, [2009-03-04T15:03:25.502546 #17925] INFO -- : [8541, 931, 0, 0] I, [2009-03-04T15:03:26.094855 #17925] INFO -- : [8545, 6678, 0, 0] I, [2009-03-04T15:03:26.353079 #17925] INFO -- : [5448, 1598, 185, 0] I, [2009-03-04T15:03:26.360148 #17925] INFO -- : [8555, 1747, 0, 0] I, [2009-03-04T15:03:26.367523 #17925] INFO -- : [7630, 278, 0, 0] I, [2009-03-04T15:03:26.375845 #17925] INFO -- : [7640, 286, 0, 0] I, [2009-03-04T15:03:26.562425 #17925] INFO -- : [5721, 896, 0, 0] I, [2009-03-04T15:03:30.951336 #17925] INFO -- : [8551, 4752, 1587, 1] I, [2009-03-04T15:03:30.960007 #17925] INFO -- : [5709, 5295, 0, 0] I, [2009-03-04T15:03:30.966612 #17925] INFO -- : [7252, 4928, 0, 0] I, [2009-03-04T15:03:30.974251 #17925] INFO -- : [8561, 4883, 1, 0] I, [2009-03-04T15:03:31.230426 #17925] INFO -- : [8563, 3866, 250, 0] I, [2009-03-04T15:03:31.236830 #17925] INFO -- : [8567, 4122, 0, 0] I, [2009-03-04T15:03:32.056901 #17925] INFO -- : [5696, 5902, 526, 1] I, [2009-03-04T15:03:32.086004 #17925] INFO -- : [5805, 793, 0, 0] I, [2009-03-04T15:03:32.110039 #17925] INFO -- : [5786, 818, 0, 0] I, [2009-03-04T15:03:32.131433 #17925] INFO -- : [5777, 840, 0, 0] </code></pre> <p>I'd like to create a shell script that calculates the average of the 2nd and 3rd fields in brackets (<code>840</code> and <code>0</code> in the last example). An even tougher question: is it possible to get the average of the 3rd field only when the last one is not <code>0</code>?</p> <p>I know I could use <code>Ruby</code> or another language to create a script, but I'd like to do it in <code>Bash</code>. Any good suggestions on resources or hints in how to create such a script would help.</p>
 

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