1 <stránka

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

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

     4 	

     5 	<nadpis>Validating relational data</nadpis>

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

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

     8 

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

    10 		

    11 		<p>

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

    13 		</p>

    14 		

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

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

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

    18 

    19 		<p>

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

    21 		</p>

    22 		

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

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

    25 	echo "valid relational data";

    26 else

    27 	echo "garbage";

    28 fi]]></m:pre>

    29 		

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

    31 		

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

    33 		

    34 		<p>

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

    36 		</p>

    37 		

    38 	</text>

    39 

    40 </stránka>