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    <p>another awk solution </p> <p>if the block you are gonna extract is always at the top of the file, and there will be only 1 or 0 block in your output:</p> <pre><code>awk '/\[Tracer\]/{print;f=1;next;} {if(NR==2){if(f &amp;&amp; $0~/interest/){print;next;} else exit;} if(f &amp;&amp; $0) print; else exit;}' file </code></pre> <p>if you want to catch more blocks:</p> <pre><code>awk '/\[Tracer\]/{h=$0;f=1;l=NR;next;} {if(NR==l+1){if(f &amp;&amp; $0~/interest/){print h;print;} else {f=0;h=""; }next;} if(f) if($0)print;else f=0; }' file </code></pre> <p><strong>test on both above</strong></p> <pre><code> #input file, in this case, 1st and 3rd blocks should be in your output (for solution 2) kent$ cat file 2012-01-12 22:20:21,638 INFO [Tracer] interesting ...some number of additional lines... xxx yyy zzz ...other stuff... 2012-01-12 22:20:21,638 INFO [Tracer] NOT-wanted-NOT ...some number of additional lines... xxx#### yyy#### zzz#### ...other #### stuff... 2012-01-12 22:20:21,638 INFO [Tracer] interest ...some number of additional lines... xxxWANTWANTWANT yyy.WANTWANTWANT zzzoWANTWANTWANT blahblah #solution one: kent$ awk '/\[Tracer\]/{print;f=1;next;} {if(NR==2){if(f &amp;&amp; $0~/interest/){print;next;} else exit;} if(f &amp;&amp; $0) print; else exit;}' file 2012-01-12 22:20:21,638 INFO [Tracer] interesting ...some number of additional lines... xxx yyy zzz #solution two: kent$ awk '/\[Tracer\]/{h=$0;f=1;l=NR;next;} {if(NR==l+1){if(f &amp;&amp; $0~/interest/){print h;print;} else {f=0;h=""; }next;} if(f) if($0)print;else f=0; }' file 2012-01-12 22:20:21,638 INFO [Tracer] interesting ...some number of additional lines... xxx yyy zzz 2012-01-12 22:20:21,638 INFO [Tracer] interest ...some number of additional lines... xxxWANTWANTWANT yyy.WANTWANTWANT zzzoWANTWANTWANT </code></pre> <p>hope it helps.</p>
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    1. POBash script to select a range starting with a pattern spanning two lines and ending in a blank line. Sed?
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