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POAWK - loop through a large CSV file and print a new CSV containing records that pass criteria
 

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  1. POAWK - loop through a large CSV file and print a new CSV containing records that pass criteria
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    <p>I am trying to parse a large CSV (about 90 MB) that has a header section (130 rows, single column). Line 131 is the column header that has names for individual column (20 columns in total).</p> <p>I don't need to parse the first 9 columns, the data beginning from column #10 through colum#20 are in the following format (reformatted as column for easier view, but each row below is actually in an individual column in the CSV)</p> <p>0/0:<strong>3,0</strong>:9:0,9,90</p> <p>./.</p> <p>0/1:<strong>6,3</strong>:49:73,0,111</p> <p>0/1:<strong>13,3</strong>:99:103,0,254</p> <p>0/1:<strong>6,6</strong>:45:56,3,124</p> <p>0/1:<strong>2,2</strong>:34:43,0,51</p> <p>0/1:<strong>80,0</strong>:87:252,5,1882</p> <p>0/1:<strong>25,12</strong>:99:139,286,3281</p> <p>./.</p> <p>0/1:<strong>6,8</strong>:64:64,0,130</p> <p>0/1:<strong>4,5</strong>:65:109,0,114</p> <p>Take this "0/0:<strong>3,0</strong>:9:0,9,90" as an example, the criteria is: if the two numbers (3,0) as highlighted add up to >=20 AND the second number (0) is greater or equal to 10, then print it out to new CSV. If does not pass the criteria, just print "./." in the new CSV. The cells that have "./." already will remain "./." in the new CSV. </p> <p>I have asked a part of the question in this thread <a href="https://stackoverflow.com/questions/18244092/use-awk-to-process-a-csv-tab-delimited-line-by-line">use awk to process a csv (tab delimited) line by line</a> and, thanks to Kent, I now know how to apply the criteria to a single cell, but I need to loop through 10 columns and apply the same criteria. Below is what I have come up with, but apparently, I need more help with finishing this. Any help/suggestion will be appreciated.</p> <pre><code>BEGIN { -F'\t'; -v OFS='\t' for (i=10; i&lt;=20; i++) { t=$i; split(t,a,/[:,]/)}(a[2]+a[3])&gt;=20 &amp;&amp; a[3]&gt;=10 } } </code></pre>
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