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<title>s6-portable-utils: the s6-expr program</title>
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<a href="index.html">s6-portable-utils</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
<a href="http://skarnet.org/">skarnet.org</a>
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<h1> The <tt>s6-expr</tt> program </h1>
<p>
s6-expr evaluates an expression and writes the result to stdout.
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<h2> Interface </h2>
<pre>
s6-expr <em>expression...</em>
</pre>
<p>
s6-expr acts as the generic
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/expr.html">expr</a> utility,
except that the <strong>:</strong> operator (pattern matching) is not supported.
</p>
<p>
s6-expr accepts an arbitrary number of arguments.
</p>
<h2> Posixness </h2>
<p>
s6-expr <strong>is not</strong> suitable as a Single Unix
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/expr.html">expr</a>
program; however, if you are never using the pattern matching functionality, s6-expr
scrupulously follows the rest of the specification.
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