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    copied!<p>Doing this using just sed seems impossible to me since you need a counter and some sort of back reference. Perhaps I'm wrong, anyway, using Perl:</p> <pre><code>use warnings; use strict; my (%sizes, %part); while(&lt;&gt;) { if (/^---- End Product ----/) { print "---- Start Product ----\n"; print "PartNumber&gt;&gt; $part{Number}\n"; for my $size (map { sprintf "%02d", $_ } 1..6) { if (not defined $sizes{$size}) { print "&lt;b&gt;Size${size}_Req&gt;&gt; 0&lt;/b&gt;\n"; } } for my $size (keys %sizes) { print "Size${size}_Req&gt;&gt; $sizes{$size}\n"; } print "Part$_&gt;&gt; $part{$_}\n" for ("Color", "Description"); print "---- End Product ----\n"; %sizes = (); %part = (); } $sizes{$1} = $2 if (/^Size(\d+)_Req&gt;&gt;\s*(\d+)/); $part{$1} = $2 if (/^Part(\w+)&gt;&gt; (.*)/); } </code></pre> <p><strong>Use</strong></p> <pre><code>perl script.pl input </code></pre> <p><strong>Output</strong></p> <pre><code>---- Start Product ---- PartNumber&gt;&gt; 123457 &lt;b&gt;Size01_Req&gt;&gt; 0&lt;/b&gt; &lt;b&gt;Size03_Req&gt;&gt; 0&lt;/b&gt; &lt;b&gt;Size05_Req&gt;&gt; 0&lt;/b&gt; &lt;b&gt;Size06_Req&gt;&gt; 0&lt;/b&gt; Size04_Req&gt;&gt; 2 Size02_Req&gt;&gt; 1 PartColor&gt;&gt; Natural PartDescription&gt;&gt; Guys Tee ---- End Product ---- ---- Start Product ---- PartNumber&gt;&gt; TPIOO9205 &lt;b&gt;Size01_Req&gt;&gt; 0&lt;/b&gt; &lt;b&gt;Size02_Req&gt;&gt; 0&lt;/b&gt; &lt;b&gt;Size03_Req&gt;&gt; 0&lt;/b&gt; &lt;b&gt;Size04_Req&gt;&gt; 0&lt;/b&gt; &lt;b&gt;Size06_Req&gt;&gt; 0&lt;/b&gt; Size05_Req&gt;&gt; 1 PartColor&gt;&gt; Natural PartDescription&gt;&gt; Black Hoodie ---- End Product ---- </code></pre>
 

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