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Redirection.html
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<div id="nav"><div>Next: <a href='Фильтры.html'>Фильтры</a>, Previous: <a href='Chmod & Chown.html'>Chmod & Chown</a>, Up: <a href='index.html'>Index</a></div></div>
<div id="titlearea">
<h2>Redirection</h2>
</div>
<div id="contentarea"><div class="cell text-cell">To suppress — redirect <span style="font-family: Menlo, Consolas, "Ubuntu Mono", Monaco, source-code-pro, monospace; font-size: 11.699999809265137px; background-color: rgba(0, 0, 0, 0.0392157);">STDERR</span> to <i>/dev/null ,</i> which is a <i>Pseudo-device special file. (</i><u><i>bit bucket</i></u><i>) </i>(<a href="https://stackoverflow.com/questions/10508843/what-is-dev-null-21">https://stackoverflow.com/questions/10508843/what-is-dev-null-21</a>)</div><div class="cell text-cell"><h3><span style="font-weight: normal;">Documentation</span>:</h3><div><ul><li><code style="font-size: 11.699999809265137px;">></code> Syntax: <em>file_descriptor</em><sub>opt</sub> <code style="font-size: 11.699999809265137px;">></code> <em>file_name</em></li><li><code style="font-size: 11.699999809265137px;">>&</code> Syntax: <em>file_descriptor</em><sub>opt</sub> <code style="font-size: 11.699999809265137px;">>&</code> <em>file_descriptor</em></li><li><code style="font-size: 11.699999809265137px;">&></code> Syntax: <code style="font-size: 11.699999809265137px;">&></code> <em>file_name</em></li><li><span style="color: rgb(0, 0, 0); font-style: italic;">command < input-file > output-file equivalent to </span><span style="color: rgb(0, 0, 0);"><u><i>< input-file command > output-file</i></u></span></li><li><span style="color: rgb(0, 0, 0); font-style: italic;">N < input_file</span></li><li><font color="#000000"><span style="caret-color: rgb(0, 0, 0);">here stuff: </span></font><a href="https://en.wikipedia.org/wiki/Here_document">https://en.wikipedia.org/wiki/Here_document</a>, <a href="https://askubuntu.com/questions/678915/whats-the-difference-between-and-in-bash">https://askubuntu.com/questions/678915/whats-the-difference-between-and-in-bash</a></li></ul><h3><span style="font-weight: normal;">Use</span>: <span style="font-weight: normal;">(</span><span style="color: rgb(119, 119, 119); font-size: 13px;"><code>&</code> means whatever follows is a file descriptor, not a filename)</span></h3><div><ul><li><code>&></code> will redirect all (<span style="font-family: Menlo, Consolas, "Ubuntu Mono", Monaco, source-code-pro, monospace; font-size: 11.699999809265137px; background-color: rgba(0, 0, 0, 0.0392157);">STDOUT</span> and <span style="font-family: Menlo, Consolas, "Ubuntu Mono", Monaco, source-code-pro, monospace; font-size: 11.699999809265137px; background-color: rgba(0, 0, 0, 0.0392157);">STDIN</span>)<br></li><li><code>2>&1</code> simply says redirect <code>STDERR</code> to <code>STDOUT</code><br></li></ul></div></div></div><div class="cell text-cell"><h3><span class="mw-headline" id="Pseudo-devices" style="font-weight: normal;">Pseudo-devices:</span></h3><p>Device nodes on Unix-like systems do not necessarily have to correspond to <a href="https://en.wikipedia.org/wiki/Physical_device" class="mw-redirect" title="Physical device">physical devices</a>. Nodes that lack this correspondence form the group of <i>pseudo-devices</i>.
They provide various functions handled by the operating system. Some
of the most commonly used (character-based) pseudo-devices include:
</p>
<ul><li><code><a href="https://en.wikipedia.org/wiki//dev/null" class="mw-redirect" title="/dev/null">/dev/null</a></code> – accepts and discards all input; produces no output (always returns an <a href="https://en.wikipedia.org/wiki/End-of-file" title="End-of-file">end-of-file</a> indication on a read)</li>
<li><code><a href="https://en.wikipedia.org/wiki//dev/zero" title="/dev/zero">/dev/zero</a></code> – accepts and discards all input; produces a continuous stream of <a href="https://en.wikipedia.org/wiki/Null_character" title="Null character">NUL</a> (zero value) bytes</li>
<li><code><a href="https://en.wikipedia.org/wiki//dev/full" title="/dev/full">/dev/full</a></code> – produces a continuous stream of <a href="https://en.wikipedia.org/wiki/Null_character" title="Null character">NUL</a> (zero value) bytes when read, and returns a "disk full" message when written to</li>
<li><code><a href="https://en.wikipedia.org/wiki//dev/random" title="/dev/random">/dev/random</a></code> and <code><a href="https://en.wikipedia.org/wiki//dev/urandom" class="mw-redirect" title="/dev/urandom">/dev/urandom</a></code> – they produce a variable-length stream of <a href="https://en.wikipedia.org/wiki/Pseudorandom" class="mw-redirect" title="Pseudorandom">pseudo-random</a> numbers.</li></ul>
<h3><span class="mw-headline" id="Node_creation"></span></h3></div></div>
<script>document.body.onkeyup = function(e) {
if (e.keyCode === 39) window.location.href = 'Фильтры.html';
if (e.keyCode === 37) window.location.href = 'Chmod & Chown.html';
}</script>
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