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POWhy is sort -k not working all the time?
 

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  1. POWhy is sort -k not working all the time?
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    <p>I have now a script that puts a list of files in two separate arrays:</p> <p>First, I get a file list from a ZIP file and fill <code>FIRST_Array()</code> with it. Second, I get a file list from a control file within a ZIP file and fill <code>SECOND_Array()</code> with it</p> <pre><code>while read length date time filename do FIRST_Array+=( "$filename" ) echo "$filename" &gt;&gt; FIRST.report.out done &lt; &lt;(/usr/bin/unzip -qql AAA.ZIP |sort -g -k12 -t~) </code></pre> <p>Third, I compare both array like so:</p> <pre><code>diff -q &lt;(printf "%s\n" "${FIRST_Array[@]}") &lt;(printf "%s\n" "${SECOND_Array[@]}") |wc -l </code></pre> <p>I can tell that <code>Diff</code> fails because I output each array to files: <code>FIRST.report.out</code> and <code>SECOND.report.out</code> are simply not sorted properly. </p> <p>1) FIRST.report.out (what's inside the ZIP file)</p> <p><code>JGS-Memphis~AT1~Pre-Test~X-BanhT~JGMDTV387~6~P~1100~HR24-500~033072053326~20120808~240914.XML JGS-Memphis~PRE~DTV_PREP~X-GuinE~JGMDTV069~6~P~1100~H24-700~033081107519~20120808~240914.XML JGS-Memphis~PRE~DTV_PREP~X-MooreBe~JGM98745~40~P~1100~H21-200~029264526103~20120808~240914.XML JGS-Memphis~FUN~Pre-Test~X-RossA~jgmdtv168~2~P~1100~H21-200~029415655926~20120808~240914.XML</code></p> <p>2) SECOND.report.out (what's inside the ZIP's control file)</p> <p><code>JGS-Memphis~AT1~Pre-Test~X-BanhT~JGMDTV387~6~P~1100~HR24-500~033072053326~20120808~240914.XML JGS-Memphis~FUN~Pre-Test~X-RossA~jgmdtv168~2~P~1100~H21-200~029415655926~20120808~240914.XML JGS-Memphis~PRE~DTV_PREP~X-GuinE~JGMDTV069~6~P~1100~H24-700~033081107519~20120808~240914.XML JGS-Memphis~PRE~DTV_PREP~X-MooreBe~JGM98745~40~P~1100~H21-200~029264526103~20120808~240914.XML</code></p> <p>Using <code>sort -k12 -t~</code> made sense since <code>~</code> is the delimiter for the file's date field (12th position). But it is not working consistently. Added <code>-g</code> made no difference.</p> <p>The sort is worse when my script processes bigger ZIP files. Why is sort -k not working all the time? How can I sort both arrays?</p>
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