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    <p>You probably need to explain your requirements a bit more. However it's most likely you can do what you want with the diff command (with a little help from sort and/or grep).</p> <p>Let's assume you have two files: a.properties and b.properties</p> <p>If you simply want to know if the files are different in any way, you can use</p> <pre><code>diff a.properties b.properties </code></pre> <p>You'll get no output if they're identical or a list of differences.</p> <p>If you want a comparison on a more semantic level, that is, are the two sets of properties identical, then you need to do a bit more. The files can differ textually, but mean the same thing to Java programs that use them. For example, the properties can occur in a different order. There can be blank lines, other whitespace and comments.</p> <p>If this is the case, do you care if the comments are identical? They won't effect the operation of your program, but they have a meaning (and value to those reading the file). If you don't care, strip them out.</p> <p>You probably don't care about blank lines as they have no meaning.</p> <p>You also need to handle the following case:</p> <pre><code>a.properties: prop = value b.properties: prop=value </code></pre> <p>Again, different textually (note the spaces around the equals) but have the same meaning in Java.</p> <p>Starting simple, let's assume the properties occur in the same order.</p> <p>Ignore blank lines:</p> <pre><code>diff -B a.properties b.properties </code></pre> <p>Handle random white space (eg. around the equals sign)</p> <pre><code>diff -w a.properties b.properties </code></pre> <p>Combine all of this:</p> <pre><code>diff -w -B a.properties b.properties </code></pre> <p>Strip out comments:</p> <pre><code>grep -v '^#.*$' a.properties &gt; a.tmp grep -v '^#.*$' b.properties &gt; b.tmp diff -w -B a.tmp b.tmp rm a.tmp b.tmp </code></pre> <p>Allow for properties in a different order, strip comments:</p> <pre><code>grep -v '^#.*$' a.properties | sort &gt; a.tmp grep -v '^#.*$' b.properties | sort &gt; b.tmp diff -w -B a.tmp b.tmp rm a.tmp b.tmp </code></pre>
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