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<title>s6-portable-utils: the s6-test program</title>
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<p>
<a href="index.html">s6-portable-utils</a><br />
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
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<h1> The <tt>s6-test</tt> program </h1>
<p>
s6-test evaluates an expression and indicates the result via its
exit status.
</p>
<h2> Interface </h2>
<pre>
s6-test <em>expression...</em>
</pre>
<p>
s6-test acts as the generic
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html">test</a> utility,
but it diverges from the specification on one point: if an argument starts with a backslash,
this backslash is ignored (and the argument cannot be an operation). This is a simple
disambiguation technique that has unfortunately not been chosen by the standard.
</p>
<p>
s6-test accepts an arbitrary number of arguments.
</p>
<h2> Exit codes </h2>
<ul>
<li> 0: the test is true </li>
<li> 1: the test is false </li>
<li> 100: wrong usage </li>
<li> 101: internal error (should never happen, warrants a bug-report) </li>
<li> 111: system call failure </li>
</ul>
<h2> Posixness </h2>
<p>
s6-test <strong>is not</strong> suitable as a Single Unix
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html">test</a>
program; however, if your arguments never start with a backslash, it exhibits the
exact same behaviour.
</p>
<h2> Non-standard expressions </h2>
<ul>
<li> <tt>-v <em>VAR</em></tt> : tests whether the
<em>VAR</em> variable is defined in the current environment. </li>
<li> <tt><em>string</em> =~ <em>pattern</em></tt> :
tries to match <em>string</em> against extended regular expression
<em>pattern</em>. True if any part of <em>string</em> matches <em>pattern</em>;
in order to match whole strings, you must anchor <em>pattern</em> with
<tt>^</tt> and <tt>$</tt> markers. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> <strong>This program is deprecated.</strong> It will disappear in a
near future version of s6-portable-utils. You are encouraged to use
<a href="https://skarnet.org/software/execline/eltest.html">eltest</a>
instead, which has the same interface and functionality, and is a part of the
<a href="https://skarnet.org/software/execline/">execline</a> package. </li>
</ul>
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