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<ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">Introduction</a></li><li class="chapter-item expanded "><a href="installation.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="build.html"><strong aria-hidden="true">2.</strong> Build from source</a></li><li class="chapter-item expanded "><a href="platforms.html"><strong aria-hidden="true">3.</strong> Platform support</a></li><li class="chapter-item expanded "><a href="contributing.html"><strong aria-hidden="true">4.</strong> Contributing</a></li><li class="chapter-item expanded "><a href="test_coverage.html"><strong aria-hidden="true">5.</strong> GNU test coverage</a></li><li class="chapter-item expanded "><a href="extensions.html" class="active"><strong aria-hidden="true">6.</strong> Extensions</a></li><li class="chapter-item expanded affix "><li class="part-title">Reference</li><li class="chapter-item expanded "><a href="multicall.html"><strong aria-hidden="true">7.</strong> Multi-call binary</a></li><li class="chapter-item expanded "><a href="utils/arch.html"><strong aria-hidden="true">8.</strong> arch</a></li><li class="chapter-item expanded "><a href="utils/b2sum.html"><strong aria-hidden="true">9.</strong> b2sum</a></li><li class="chapter-item expanded "><a href="utils/b3sum.html"><strong aria-hidden="true">10.</strong> b3sum</a></li><li class="chapter-item expanded "><a href="utils/base32.html"><strong aria-hidden="true">11.</strong> base32</a></li><li class="chapter-item expanded "><a href="utils/base64.html"><strong aria-hidden="true">12.</strong> base64</a></li><li class="chapter-item expanded "><a href="utils/basename.html"><strong aria-hidden="true">13.</strong> basename</a></li><li class="chapter-item expanded "><a href="utils/basenc.html"><strong aria-hidden="true">14.</strong> basenc</a></li><li class="chapter-item expanded "><a href="utils/cat.html"><strong aria-hidden="true">15.</strong> cat</a></li><li class="chapter-item expanded "><a href="utils/chcon.html"><strong aria-hidden="true">16.</strong> chcon</a></li><li class="chapter-item expanded "><a href="utils/chgrp.html"><strong aria-hidden="true">17.</strong> chgrp</a></li><li class="chapter-item expanded "><a href="utils/chmod.html"><strong aria-hidden="true">18.</strong> chmod</a></li><li class="chapter-item expanded "><a href="utils/chown.html"><strong aria-hidden="true">19.</strong> chown</a></li><li class="chapter-item expanded "><a href="utils/chroot.html"><strong aria-hidden="true">20.</strong> chroot</a></li><li class="chapter-item expanded "><a href="utils/cksum.html"><strong aria-hidden="true">21.</strong> cksum</a></li><li class="chapter-item expanded "><a href="utils/comm.html"><strong aria-hidden="true">22.</strong> comm</a></li><li class="chapter-item expanded "><a href="utils/cp.html"><strong aria-hidden="true">23.</strong> cp</a></li><li class="chapter-item expanded "><a href="utils/csplit.html"><strong aria-hidden="true">24.</strong> csplit</a></li><li class="chapter-item expanded "><a href="utils/cut.html"><strong aria-hidden="true">25.</strong> cut</a></li><li class="chapter-item expanded "><a href="utils/date.html"><strong aria-hidden="true">26.</strong> date</a></li><li class="chapter-item expanded "><a href="utils/dd.html"><strong aria-hidden="true">27.</strong> dd</a></li><li class="chapter-item expanded "><a href="utils/df.html"><strong aria-hidden="true">28.</strong> df</a></li><li class="chapter-item expanded "><a href="utils/dir.html"><strong aria-hidden="true">29.</strong> dir</a></li><li class="chapter-item expanded "><a href="utils/dircolors.html"><strong aria-hidden="true">30.</strong> dircolors</a></li><li class="chapter-item expanded "><a href="utils/dirname.html"><strong aria-hidden="true">31.</strong> dirname</a></li><li class="chapter-item expanded "><a href="utils/du.html"><strong aria-hidden="true">32.</strong> du</a></li><li class="chapter-item expanded "><a href="utils/echo.html"><strong aria-hidden="true">33.</strong> echo</a></li><li class="chapter-item expanded "><a href="utils/env.html"><strong aria-hidden="true">34.</strong> env</a></li><li class="chapter-item expanded "><a href="utils/expand.html"><strong aria-hidden="true">35.</strong> expand</a></li><li class="chapter-item expanded "><a href="utils/expr.html"><strong aria-hidden="true">36.</strong> expr</a></li><li class="chapter-item expanded "><a href="utils/factor.html"><strong aria-hidden="true">37.</strong> factor</a></li><li class="chapter-item expanded "><a href="utils/false.html"><strong aria-hidden="true">38.</strong> false</a></li><li class="chapter-item expanded "><a href="utils/fmt.html"><strong aria-hidden="true">39.</strong> fmt</a></li><li class="chapter-item expanded "><a href="utils/fold.html"><strong aria-hidden="true">40.</strong> fold</a></li><li class="chapter-item expanded "><a href="utils/groups.html"><strong aria-hidden="true">41.</strong> groups</a></li><li class="chapter-item expanded "><a href="utils/hashsum.html"><strong aria-hidden="true">42.</strong> hashsum</a></li><li class="chapter-item expanded "><a href="utils/head.html"><strong aria-hidden="true">43.</strong> head</a></li><li class="chapter-item expanded "><a href="utils/hostid.html"><strong aria-hidden="true">44.</strong> hostid</a></li><li class="chapter-item expanded "><a href="utils/hostname.html"><strong aria-hidden="true">45.</strong> hostname</a></li><li class="chapter-item expanded "><a href="utils/id.html"><strong aria-hidden="true">46.</strong> id</a></li><li class="chapter-item expanded "><a href="utils/install.html"><strong aria-hidden="true">47.</strong> install</a></li><li class="chapter-item expanded "><a href="utils/join.html"><strong aria-hidden="true">48.</strong> join</a></li><li class="chapter-item expanded "><a href="utils/kill.html"><strong aria-hidden="true">49.</strong> kill</a></li><li class="chapter-item expanded "><a href="utils/link.html"><strong aria-hidden="true">50.</strong> link</a></li><li class="chapter-item expanded "><a href="utils/ln.html"><strong aria-hidden="true">51.</strong> ln</a></li><li class="chapter-item expanded "><a href="utils/logname.html"><strong aria-hidden="true">52.</strong> logname</a></li><li class="chapter-item expanded "><a href="utils/ls.html"><strong aria-hidden="true">53.</strong> ls</a></li><li class="chapter-item expanded "><a href="utils/md5sum.html"><strong aria-hidden="true">54.</strong> md5sum</a></li><li class="chapter-item expanded "><a href="utils/mkdir.html"><strong aria-hidden="true">55.</strong> mkdir</a></li><li class="chapter-item expanded "><a href="utils/mkfifo.html"><strong aria-hidden="true">56.</strong> mkfifo</a></li><li class="chapter-item expanded "><a href="utils/mknod.html"><strong aria-hidden="true">57.</strong> mknod</a></li><li class="chapter-item expanded "><a href="utils/mktemp.html"><strong aria-hidden="true">58.</strong> mktemp</a></li><li class="chapter-item expanded "><a href="utils/more.html"><strong aria-hidden="true">59.</strong> more</a></li><li class="chapter-item expanded "><a href="utils/mv.html"><strong aria-hidden="true">60.</strong> mv</a></li><li class="chapter-item expanded "><a href="utils/nice.html"><strong aria-hidden="true">61.</strong> nice</a></li><li class="chapter-item expanded "><a href="utils/nl.html"><strong aria-hidden="true">62.</strong> nl</a></li><li class="chapter-item expanded "><a href="utils/nohup.html"><strong aria-hidden="true">63.</strong> nohup</a></li><li class="chapter-item expanded "><a href="utils/nproc.html"><strong aria-hidden="true">64.</strong> nproc</a></li><li class="chapter-item expanded "><a href="utils/numfmt.html"><strong aria-hidden="true">65.</strong> numfmt</a></li><li class="chapter-item expanded "><a href="utils/od.html"><strong aria-hidden="true">66.</strong> od</a></li><li class="chapter-item expanded "><a href="utils/paste.html"><strong aria-hidden="true">67.</strong> paste</a></li><li class="chapter-item expanded "><a href="utils/pathchk.html"><strong aria-hidden="true">68.</strong> pathchk</a></li><li class="chapter-item expanded "><a href="utils/pinky.html"><strong aria-hidden="true">69.</strong> pinky</a></li><li class="chapter-item expanded "><a href="utils/pr.html"><strong aria-hidden="true">70.</strong> pr</a></li><li class="chapter-item expanded "><a href="utils/printenv.html"><strong aria-hidden="true">71.</strong> printenv</a></li><li class="chapter-item expanded "><a href="utils/printf.html"><strong aria-hidden="true">72.</strong> printf</a></li><li class="chapter-item expanded "><a href="utils/ptx.html"><strong aria-hidden="true">73.</strong> ptx</a></li><li class="chapter-item expanded "><a href="utils/pwd.html"><strong aria-hidden="true">74.</strong> pwd</a></li><li class="chapter-item expanded "><a href="utils/readlink.html"><strong aria-hidden="true">75.</strong> readlink</a></li><li class="chapter-item expanded "><a href="utils/realpath.html"><strong aria-hidden="true">76.</strong> realpath</a></li><li class="chapter-item expanded "><a href="utils/relpath.html"><strong aria-hidden="true">77.</strong> relpath</a></li><li class="chapter-item expanded "><a href="utils/rm.html"><strong aria-hidden="true">78.</strong> rm</a></li><li class="chapter-item expanded "><a href="utils/rmdir.html"><strong aria-hidden="true">79.</strong> rmdir</a></li><li class="chapter-item expanded "><a href="utils/runcon.html"><strong aria-hidden="true">80.</strong> runcon</a></li><li class="chapter-item expanded "><a href="utils/seq.html"><strong aria-hidden="true">81.</strong> seq</a></li><li class="chapter-item expanded "><a href="utils/sha1sum.html"><strong aria-hidden="true">82.</strong> sha1sum</a></li><li class="chapter-item expanded "><a href="utils/sha224sum.html"><strong aria-hidden="true">83.</strong> sha224sum</a></li><li class="chapter-item expanded "><a href="utils/sha256sum.html"><strong aria-hidden="true">84.</strong> sha256sum</a></li><li class="chapter-item expanded "><a href="utils/sha3-224sum.html"><strong aria-hidden="true">85.</strong> sha3-224sum</a></li><li class="chapter-item expanded "><a href="utils/sha3-256sum.html"><strong aria-hidden="true">86.</strong> sha3-256sum</a></li><li class="chapter-item expanded "><a href="utils/sha3-384sum.html"><strong aria-hidden="true">87.</strong> sha3-384sum</a></li><li class="chapter-item expanded "><a href="utils/sha3-512sum.html"><strong aria-hidden="true">88.</strong> sha3-512sum</a></li><li class="chapter-item expanded "><a href="utils/sha384sum.html"><strong aria-hidden="true">89.</strong> sha384sum</a></li><li class="chapter-item expanded "><a href="utils/sha3sum.html"><strong aria-hidden="true">90.</strong> sha3sum</a></li><li class="chapter-item expanded "><a href="utils/sha512sum.html"><strong aria-hidden="true">91.</strong> sha512sum</a></li><li class="chapter-item expanded "><a href="utils/shake128sum.html"><strong aria-hidden="true">92.</strong> shake128sum</a></li><li class="chapter-item expanded "><a href="utils/shake256sum.html"><strong aria-hidden="true">93.</strong> shake256sum</a></li><li class="chapter-item expanded "><a href="utils/shred.html"><strong aria-hidden="true">94.</strong> shred</a></li><li class="chapter-item expanded "><a href="utils/shuf.html"><strong aria-hidden="true">95.</strong> shuf</a></li><li class="chapter-item expanded "><a href="utils/sleep.html"><strong aria-hidden="true">96.</strong> sleep</a></li><li class="chapter-item expanded "><a href="utils/sort.html"><strong aria-hidden="true">97.</strong> sort</a></li><li class="chapter-item expanded "><a href="utils/split.html"><strong aria-hidden="true">98.</strong> split</a></li><li class="chapter-item expanded "><a href="utils/stat.html"><strong aria-hidden="true">99.</strong> stat</a></li><li class="chapter-item expanded "><a href="utils/stdbuf.html"><strong aria-hidden="true">100.</strong> stdbuf</a></li><li class="chapter-item expanded "><a href="utils/stty.html"><strong aria-hidden="true">101.</strong> stty</a></li><li class="chapter-item expanded "><a href="utils/sum.html"><strong aria-hidden="true">102.</strong> sum</a></li><li class="chapter-item expanded "><a href="utils/sync.html"><strong aria-hidden="true">103.</strong> sync</a></li><li class="chapter-item expanded "><a href="utils/tac.html"><strong aria-hidden="true">104.</strong> tac</a></li><li class="chapter-item expanded "><a href="utils/tail.html"><strong aria-hidden="true">105.</strong> tail</a></li><li class="chapter-item expanded "><a href="utils/tee.html"><strong aria-hidden="true">106.</strong> tee</a></li><li class="chapter-item expanded "><a href="utils/test.html"><strong aria-hidden="true">107.</strong> test</a></li><li class="chapter-item expanded "><a href="utils/timeout.html"><strong aria-hidden="true">108.</strong> timeout</a></li><li class="chapter-item expanded 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aria-hidden="true">117.</strong> uniq</a></li><li class="chapter-item expanded "><a href="utils/unlink.html"><strong aria-hidden="true">118.</strong> unlink</a></li><li class="chapter-item expanded "><a href="utils/uptime.html"><strong aria-hidden="true">119.</strong> uptime</a></li><li class="chapter-item expanded "><a href="utils/users.html"><strong aria-hidden="true">120.</strong> users</a></li><li class="chapter-item expanded "><a href="utils/vdir.html"><strong aria-hidden="true">121.</strong> vdir</a></li><li class="chapter-item expanded "><a href="utils/wc.html"><strong aria-hidden="true">122.</strong> wc</a></li><li class="chapter-item expanded "><a href="utils/who.html"><strong aria-hidden="true">123.</strong> who</a></li><li class="chapter-item expanded "><a href="utils/whoami.html"><strong aria-hidden="true">124.</strong> whoami</a></li><li class="chapter-item expanded "><a href="utils/yes.html"><strong aria-hidden="true">125.</strong> yes</a></li></ol>
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<main>
<h1 id="extensions-over-gnu"><a class="header" href="#extensions-over-gnu">Extensions over GNU</a></h1>
<p>Though the main goal of the project is compatibility, uutils supports a few
features that are not supported by GNU coreutils. We take care not to introduce
features that are incompatible with the GNU coreutils. Below is a list of uutils
extensions.</p>
<h2 id="general"><a class="header" href="#general">General</a></h2>
<p>GNU coreutils provides two ways to define short options taking an argument:</p>
<pre><code>$ ls -w 80
$ ls -w80
</code></pre>
<p>We support a third way:</p>
<pre><code>$ ls -w=80
</code></pre>
<h2 id="env"><a class="header" href="#env"><code>env</code></a></h2>
<p><code>env</code> has an additional <code>-f</code>/<code>--file</code> flag that can parse <code>.env</code> files and set
variables accordingly. This feature is adopted from <code>dotenv</code> style packages.</p>
<h2 id="cp"><a class="header" href="#cp"><code>cp</code></a></h2>
<p><code>cp</code> can display a progress bar when the <code>-g</code>/<code>--progress</code> flag is set.</p>
<h2 id="mv"><a class="header" href="#mv"><code>mv</code></a></h2>
<p><code>mv</code> can display a progress bar when the <code>-g</code>/<code>--progress</code> flag is set.</p>
<h2 id="hashsum"><a class="header" href="#hashsum"><code>hashsum</code></a></h2>
<p>This utility does not exist in GNU coreutils. <code>hashsum</code> is a utility that
supports computing the checksums with several algorithms. The flags and options
are identical to the <code>*sum</code> family of utils (<code>sha1sum</code>, <code>sha256sum</code>, <code>b2sum</code>,
etc.).</p>
<h2 id="b3sum"><a class="header" href="#b3sum"><code>b3sum</code></a></h2>
<p>This utility does not exist in GNU coreutils. The behavior is modeled after both
the <code>b2sum</code> utility of GNU and the
<a href="https://github.com/BLAKE3-team/BLAKE3"><code>b3sum</code></a> utility by the BLAKE3 team and
supports the <code>--no-names</code> option that does not appear in the GNU util.</p>
<h2 id="more"><a class="header" href="#more"><code>more</code></a></h2>
<p>We provide a simple implementation of <code>more</code>, which is not part of GNU
coreutils. We do not aim for full compatibility with the <code>more</code> utility from
<code>util-linux</code>. Features from more modern pagers (like <code>less</code> and <code>bat</code>) are
therefore welcomed.</p>
<h2 id="cut"><a class="header" href="#cut"><code>cut</code></a></h2>
<p><code>cut</code> can separate fields by whitespace (Space and Tab) with <code>-w</code> flag. This
feature is adopted from <a href="https://www.freebsd.org/cgi/man.cgi?cut">FreeBSD</a>.</p>
<h2 id="fmt"><a class="header" href="#fmt"><code>fmt</code></a></h2>
<p><code>fmt</code> has additional flags for prefixes: <code>-P</code>/<code>--skip-prefix</code>, <code>-x</code>/<code>--exact-prefix</code>, and
<code>-X</code>/<code>--exact-skip-prefix</code>. With <code>-m</code>/<code>--preserve-headers</code>, an attempt is made to detect and preserve
mail headers in the input. <code>-q</code>/<code>--quick</code> breaks lines more quickly. And <code>-T</code>/<code>--tab-width</code> defines the
number of spaces representing a tab when determining the line length.</p>
<h2 id="seq"><a class="header" href="#seq"><code>seq</code></a></h2>
<p><code>seq</code> provides <code>-t</code>/<code>--terminator</code> to set the terminator character.</p>
<h2 id="ls"><a class="header" href="#ls"><code>ls</code></a></h2>
<p>GNU <code>ls</code> provides two ways to use a long listing format: <code>-l</code> and <code>--format=long</code>. We support a
third way: <code>--long</code>.</p>
<h2 id="du"><a class="header" href="#du"><code>du</code></a></h2>
<p><code>du</code> allows <code>birth</code> and <code>creation</code> as values for the <code>--time</code> argument to show the creation time.</p>
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