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PODiff: ignoring lines with just tabs
 

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  1. PODiff: ignoring lines with just tabs
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    <p>I'm trying to diff files, and determine if they are the same, but ignoring ALL whitespace. </p> <p>When using <code>diff</code>, the <code>-b</code> tells <code>diff</code> to ignore whitespace on a given line. The <code>-B</code> option tells it to ignore all blank lines. But, if you have a line which contains only spaces, the <code>-B</code> and <code>-b</code> don't seem to work together.</p> <p>I've resorted to using the <code>-I</code> option, where I want diff to ignore all lines which only contain whitespaces, which works fine when the line contains only spaces, but the <code>\t</code> doesn't seem to match tab characters. </p> <p>I found one reference online that mentioned that you need to use POSIX regexp, but POSIX states that <code>:blank:</code> will match any whitespace (including tab). That does not work either. </p> <p>Here's a sample of what I'm trying to do. Ideally, my <code>diff</code> line would state that <code>t1.txt</code>, <code>t2.txt</code> and <code>t3.txt</code> were all the same.</p> <pre><code>bash#&gt; echo hi &gt; t1.txt bash#&gt; echo hi &gt; t2.txt bash#&gt; echo hi &gt; t3.txt bash#&gt; echo " " &gt;&gt; t2.txt bash#&gt; echo -e "\t" &gt;&gt; t3.txt bash#&gt; diff -BbaNq -I "^[ \t]*$" t1.txt t2.txt bash#&gt; diff -BbaNq -I "^[ \t]*$" t1.txt t3.txt Files t1.txt and t3.txt differ bash#&gt; diff -BbaNq -I "^[:blank:]*$" t1.txt t3.txt Files t1.txt and t3.txt differ bash#&gt; </code></pre> <p>Any help in what the syntax for <code>diff</code> would be would be very helpful.</p>
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