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<title>s6-portable-utils: the s6-grep 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-grep</tt> program </h1>
<p>
s6-grep matches its input against a pattern.
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<h2> Interface </h2>
<pre>
s6-grep [ -E | -F ] [ -i ] [ -c ] [ -n ] [ -q ] [ -v ] <em>pattern</em>
</pre>
<ul>
<li> s6-grep compiles <em>pattern</em> as an
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03">Basic
Regular Expression</a> </li>
<li> It reads stdin and matches every line against this regexp </li>
<li> If the line matches, it prints it to stdout </li>
<li> It exits on EOF with code 0 if one or more lines matched and 1
otherwise. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-F</tt> : <em>pattern</em> is not compiled as a BRE, but is
interpreted as a literal string. </li>
<li> <tt>-E</tt> : <em>pattern</em> is not compiled as a BRE, but as an
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">Extended
Regular Expression</a> (ERE). </li>
<li> <tt>-i</tt> : ignore case during the match </li>
<li> <tt>-c</tt> : do not write normal output; only write the number of
lines that have matched <em>pattern</em> after EOF is received </li>
<li> <tt>-n</tt> : precede every output line by its number and a colon.
The first input line has number 1. </li>
<li> <tt>-q</tt> : do not write anything to stdout </li>
<li> <tt>-v</tt> : invert the pattern matching (select lines that do not
match <em>pattern</em>). </li>
</ul>
<h2> Posixness </h2>
<p>
s6-grep <strong>is not</strong> suitable as a Single Unix
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html">grep</a>
program.
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