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<title>s6-portable-utils - skarnet.org's tiny general Unix utilities</title>
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<p>
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> s6-portable-utils </h1>
<h2> What is it ? </h2>
<p>
s6-portable-utils is a set of tiny general Unix utilities, often
performing well-known tasks such as <em>cut</em> and <em>grep</em>,
but optimized for simplicity and small size. They were designed
for embedded systems and other constrained environments, but they
work everywhere.
</p>
<p>
Other set of small utilities are usually system-specific; for
instance, the (otherwise good)
<a href="https://busybox.net/">BusyBox</a> project only works on Linux.
</p>
<p>
Some of s6-portable-utils' programs are a conformant implementation
of a POSIX utility as determined by the
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/nfindex.html">Single
Unix Specification, version 4</a>; the relevant documentation pages mentions
this.
However, none of the s6-portable-utils programs supports internationalization.
</p>
<p>
It is now an explicit non-goal of s6-portable-utils to duplicate the work of
existing projects that aim to provide a lightweight implementation of
standard commands.
No more rewriting of standard commands will occur in s6-portable-utils;
the package is now used to host specific utilities such as
<a href="s6-uniquename.html"><tt>s6-uniquename</tt></a>.
</p>
<p>
Prefixing the name of this package — and the names of the binaries it
provides — with <tt>s6-</tt> was a naming mistake. It happened in the
early days of the
<a href="//skarnet.org/software/s6/">s6</a> project, before it grew and
became an ecosystem focused on supervision, service management and init;
despite sharing the same author and the same philosophy, and being designed
to work with it, <tt>s6-portable-utils</tt> is <strong>not</strong>,
stricto sensu, part of the s6 ecosystem, and if you arrived here while trying
to understand what <a href="//skarnet.org/software/s6/">s6</a> is, you are
on the wrong page. I apologize for the confusion.
</p>
<hr />
<h2> Installation </h2>
<h3> Requirements </h3>
<ul>
<li> A POSIX-compliant system with a standard C development environment </li>
<li> GNU make, version 3.81 or later </li>
<li> <a href="//skarnet.org/software/skalibs/">skalibs</a> version
2.10.0.3 or later. It's a build-time requirement. It's also a run-time
requirement if you link against the shared version of the skalibs
library. </li>
</ul>
<h3> Licensing </h3>
<p>
s6-portable-utils is free software. It is available under the
<a href="https://opensource.org/licenses/ISC">ISC license</a>.
</p>
<h3> Download </h3>
<ul>
<li> The current released version of s6-portable-utils is
<a href="s6-portable-utils-2.2.3.2.tar.gz">2.2.3.2</a>. </li>
<li> Alternatively, you can checkout a copy of the
<a href="//git.skarnet.org/cgi-bin/cgit.cgi/s6-portable-utils/">s6-portable-utils
git repository</a>:
<pre> git clone git://git.skarnet.org/s6-portable-utils </pre> </li>
<li> There's also a
<a href="https://github.com/skarnet/s6-portable-utils">GitHub mirror</a>
of the s6-portable-utils git repository. </li>
</ul>
<h3> Compilation </h3>
<ul>
<li> See the enclosed INSTALL file for installation details. </li>
</ul>
<h3> Upgrade notes </h3>
<ul>
<li> <a href="upgrade.html">This page</a> lists the differences to be aware of between
the previous versions of s6-portable-utils and the current one. </li>
</ul>
<hr />
<h2> Reference </h2>
<h3> Commands </h3>
<p>
All these commands exit 111 if they encounter a temporary error, and
100 if they encounter a permanent error - such as a misuse. They exit
127 if they're trying to execute into a program and cannot find it, and
126 if they fail to execute into a program for another reason.
</p>
<ul>
<li> The <a href="s6-basename.html"><tt>s6-basename</tt></a> program </li>
<li> The <a href="s6-cat.html"><tt>s6-cat</tt></a> program </li>
<li> The <a href="s6-chmod.html"><tt>s6-chmod</tt></a> program </li>
<li> The <a href="s6-chown.html"><tt>s6-chown</tt></a> program </li>
<li> The <a href="s6-clock.html"><tt>s6-clock</tt></a> program </li>
<li> The <a href="s6-cut.html"><tt>s6-cut</tt></a> program </li>
<li> The <a href="s6-dirname.html"><tt>s6-dirname</tt></a> program </li>
<li> The <a href="s6-dumpenv.html"><tt>s6-dumpenv</tt></a> program </li>
<li> The <a href="s6-echo.html"><tt>s6-echo</tt></a> program </li>
<li> The <a href="s6-env.html"><tt>s6-env</tt></a> program </li>
<li> The <a href="s6-expr.html"><tt>s6-expr</tt></a> program </li>
<li> The <a href="s6-false.html"><tt>s6-false</tt></a> program </li>
<li> The <a href="s6-format-filter.html"><tt>s6-format-filter</tt></a> program </li>
<li> The <a href="s6-grep.html"><tt>s6-grep</tt></a> program </li>
<li> The <a href="s6-head.html"><tt>s6-head</tt></a> program </li>
<li> The <a href="s6-hiercopy.html"><tt>s6-hiercopy</tt></a> program </li>
<li> The <a href="s6-linkname.html"><tt>s6-linkname</tt></a> program </li>
<li> The <a href="s6-ln.html"><tt>s6-ln</tt></a> program </li>
<li> The <a href="s6-ls.html"><tt>s6-ls</tt></a> program </li>
<li> The <a href="s6-maximumtime.html"><tt>s6-maximumtime</tt></a> program </li>
<li> The <a href="s6-mkdir.html"><tt>s6-mkdir</tt></a> program </li>
<li> The <a href="s6-mkfifo.html"><tt>s6-mkfifo</tt></a> program </li>
<li> The <a href="s6-nice.html"><tt>s6-nice</tt></a> program </li>
<li> The <a href="s6-nuke.html"><tt>s6-nuke</tt></a> program </li>
<li> The <a href="s6-pause.html"><tt>s6-pause</tt></a> program </li>
<li> The <a href="s6-printenv.html"><tt>s6-printenv</tt></a> program </li>
<li> The <a href="s6-quote-filter.html"><tt>s6-quote-filter</tt></a> program </li>
<li> The <a href="s6-quote.html"><tt>s6-quote</tt></a> program </li>
<li> The <a href="s6-rename.html"><tt>s6-rename</tt></a> program </li>
<li> The <a href="s6-rmrf.html"><tt>s6-rmrf</tt></a> program </li>
<li> The <a href="s6-seq.html"><tt>s6-seq</tt></a> program </li>
<li> The <a href="s6-sleep.html"><tt>s6-sleep</tt></a> program </li>
<li> The <a href="s6-sort.html"><tt>s6-sort</tt></a> program </li>
<li> The <a href="s6-sync.html"><tt>s6-sync</tt></a> program </li>
<li> The <a href="s6-tail.html"><tt>s6-tail</tt></a> program </li>
<li> The <a href="s6-test.html"><tt>s6-test</tt></a> program </li>
<li> The <a href="s6-touch.html"><tt>s6-touch</tt></a> program </li>
<li> The <a href="s6-true.html"><tt>s6-true</tt></a> program </li>
<li> The <a href="s6-uniquename.html"><tt>s6-uniquename</tt></a> program </li>
<li> The <a href="s6-unquote-filter.html"><tt>s6-unquote-filter</tt></a> program </li>
<li> The <a href="s6-unquote.html"><tt>s6-unquote</tt></a> program </li>
<li> The <a href="s6-update-symlinks.html"><tt>s6-update-symlinks</tt></a> program </li>
<li> The <a href="seekablepipe.html"><tt>seekablepipe</tt></a> program </li>
</ul>
<h2> Related resources </h2>
<ul>
<li> <tt>s6-portable-utils</tt> is discussed on the
<a href="//skarnet.org/lists.html#skaware">skaware</a> mailing-list. </li>
</ul>
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