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copied!<p><strong>Edit:</strong> It's been noted my first solution was a little off. Here's an attempt at a fix, though I haven't tested it yet due to lack of place to test it.</p> <p>I've come up with something that might work for you, in <code>sed</code>:</p> <pre><code>/Tracer/ { N; /interesting/ { h; :a; n; H; /^$/! ba; g; p } } </code></pre> <p>An explanation follows!</p> <p>Given a test file like this:</p> <pre><code>boring boring awesome [Tracer] interesting totally interesting and awesome still interesting very interesting back to boring awesome [Tracer] Nah just kidding nope darn </code></pre> <p>The above command expands to the following, with explanation:</p> <pre><code>/Tracer/ { # Looks for Tracer N # Moves on to the next line /interesting/ { # Looks to see if "interesting" is in the next line h # Put first two lines in hold space :a # Label "a" n # Move on to next line H # Appends line to hold space /^$/! ba # If not a blank line, branch back to "a" g # Put the hold space into the pattern space p # Print the pattern space } } </code></pre> <p>And, should do it like so:</p> <pre><code>sed -n '/Tracer/ { h; n; /interesting/ { :a; H; n; /^$/! ba }; g; p }' file.txt awesome [Tracer] interesting totally interesting and awesome still interesting very interesting [blank line] </code></pre> <p>Where <code>[blank line]</code> is a literal blank line, but I can't express that in a code block here. Obviously you can modify the regexes for <code>/Tracer/</code> and <code>/interesting/</code> easily enough, depending on the specific contents of the lines.</p>

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