<stránka

	xmlns="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/strana"

	xmlns:m="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/makro">

	<nadpis>Validating relational data</nadpis>

	<perex>check whether data are in the relpipe format</perex>

	<m:pořadí-příkladu>00500</m:pořadí-příkladu>

	<text xmlns="http://www.w3.org/1999/xhtml">

		<p>

			Just a passthrough command, so these pipelines should produce the same hash:

		</p>

		<m:pre jazyk="bash"><![CDATA[

relpipe-in-fstab | relpipe-tr-validator | sha512sum

relpipe-in-fstab | sha512sum]]></m:pre>

		<p>

			This tool can be used for testing whether a file contains valid relational data:

		</p>

		<m:pre jazyk="bash"><![CDATA[

if relpipe-tr-validator < "some-file.rp" &> /dev/null; then

	echo "valid relational data";

else

	echo "garbage";

fi]]></m:pre>

		<p>or as a one-liner:</p>

		<m:pre jazyk="bash"><![CDATA[relpipe-tr-validator < "some-file.rp" &> /dev/null && echo "ok" || echo "error"]]></m:pre>

		<p>

			If an error is found, it is reported on STDERR. So just omit the <code>&amp;</code> in order to see the error message.

		</p>

	</text>

</stránka>