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373 </blockquote> |
373 </blockquote> |
374 |
374 |
375 <h2>Writing an output filter in Bash</h2> |
375 <h2>Writing an output filter in Bash</h2> |
376 |
376 |
377 <p> |
377 <p> |
378 In previous example we created and output filter in Perl. |
378 In previous example we created an output filter in Perl. |
379 We converted a relation to values separated by <code>\0</code> and then passed it through <code>xargs</code> to a perl <em>one-liner</em> (or <em>multi-liner</em> in this case). |
379 We converted a relation to values separated by <code>\0</code> and then passed it through <code>xargs</code> to a perl <em>one-liner</em> (or a <em>multi-liner</em> in this case). |
380 But we can write such output filter in pure Bash without <code>xargs</code> and <code>perl</code>. |
380 But we can write such output filter in pure Bash without <code>xargs</code> and <code>perl</code>. |
381 Of course, it is still limited to a single relation (or it can process multiple relations of same type and do something like implicit <code>UNION ALL</code>). |
381 Of course, it is still limited to a single relation (or it can process multiple relations of same type and do something like implicit <code>UNION ALL</code>). |
382 </p> |
382 </p> |
383 |
383 |
384 <p> |
384 <p> |