added example for date -f

Author: learnbyexample

atom.xml

@@ -5,12 +5,12 @@
 	<link href="https://learnbyexample.github.io/atom.xml" rel="self" type="application/atom+xml"/>
   <link href="https://learnbyexample.github.io"/>
 	<generator uri="https://www.getzola.org/">Zola</generator>
-	<updated>2024-08-02T00:00:00+00:00</updated>
+	<updated>2024-08-08T00:00:00+00:00</updated>
 	<id>https://learnbyexample.github.io/atom.xml</id>
 	<entry xml:lang="en">
 		<title>Basic examples for the Linux date command</title>
 		<published>2024-07-31T00:00:00+00:00</published>
-		<updated>2024-08-02T00:00:00+00:00</updated>
+		<updated>2024-08-08T00:00:00+00:00</updated>
 		<link rel="alternate" href="https://learnbyexample.github.io/mini/linux-date-command-examples/" type="text/html"/>
 		<id>https://learnbyexample.github.io/mini/linux-date-command-examples/</id>
 		<content type="html">&lt;p&gt;I rarely ever use the &lt;code&gt;date&lt;&#x2F;code&gt; command, but when I need it I almost always struggle to get the right incantation. So, I&#x27;m just going to record such examples in this blog post (and some good to know features).&lt;&#x2F;p&gt;
@@ -60,6 +60,18 @@
 &lt;&#x2F;span&gt;&lt;span&gt;$ date &lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span&gt;d @&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;1722422393 &lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;+&lt;&#x2F;span&gt;&lt;span style=&quot;color:#d07711;&quot;&gt;&amp;#39;&lt;&#x2F;span&gt;&lt;span style=&quot;color:#aeb52b;&quot;&gt;%F %T&lt;&#x2F;span&gt;&lt;span style=&quot;color:#d07711;&quot;&gt;&amp;#39;
 &lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;2024&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;07&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;31 16&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;09&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;53
 &lt;&#x2F;span&gt;&lt;&#x2F;code&gt;&lt;&#x2F;pre&gt;
+&lt;p&gt;You can also provide an input file for conversion using the &lt;code&gt;-f&lt;&#x2F;code&gt; option:&lt;&#x2F;p&gt;
+&lt;pre data-lang=&quot;ruby&quot; style=&quot;background-color:#f5f5f5;color:#1f1f1f;&quot; class=&quot;language-ruby &quot;&gt;&lt;code class=&quot;language-ruby&quot; data-lang=&quot;ruby&quot;&gt;&lt;span&gt;$ cat epochs.txt
+&lt;&#x2F;span&gt;&lt;span&gt;@&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;0000000000
+&lt;&#x2F;span&gt;&lt;span&gt;@&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;1234567890
+&lt;&#x2F;span&gt;&lt;span&gt;@&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;2222222222
+&lt;&#x2F;span&gt;&lt;span&gt;
+&lt;&#x2F;span&gt;&lt;span style=&quot;color:#7f8989;&quot;&gt;# recall that the -u option gives you UTC
+&lt;&#x2F;span&gt;&lt;span&gt;$ date &lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span&gt;u &lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span&gt;f epochs.txt &lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;+&lt;&#x2F;span&gt;&lt;span style=&quot;color:#d07711;&quot;&gt;&amp;#39;&lt;&#x2F;span&gt;&lt;span style=&quot;color:#aeb52b;&quot;&gt;%F %T&lt;&#x2F;span&gt;&lt;span style=&quot;color:#d07711;&quot;&gt;&amp;#39;
+&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;1970&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;01&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;01 00&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;00&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;00
+&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;2009&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;02&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;13 23&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;31&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;30
+&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;2040&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;06&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;02 03&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;57&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;:&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b3933a;&quot;&gt;02
+&lt;&#x2F;span&gt;&lt;&#x2F;code&gt;&lt;&#x2F;pre&gt;
 &lt;br&gt;
 &lt;h2 id=&quot;date-arithmetic&quot;&gt;Date arithmetic&lt;&#x2F;h2&gt;
 &lt;pre data-lang=&quot;ruby&quot; style=&quot;background-color:#f5f5f5;color:#1f1f1f;&quot; class=&quot;language-ruby &quot;&gt;&lt;code class=&quot;language-ruby&quot; data-lang=&quot;ruby&quot;&gt;&lt;span&gt;$ date &lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;-&lt;&#x2F;span&gt;&lt;span style=&quot;color:#5597d6;&quot;&gt;I

mini/linux-date-command-examples/index.html

@@ -30,6 +30,16 @@
 </span><span>
 </span><span>$ date </span><span style=color:#72ab00;>-</span><span>d @</span><span style=color:#b3933a;>1722422393 </span><span style=color:#72ab00;>+</span><span style=color:#d07711;>'</span><span style=color:#aeb52b;>%F %T</span><span style=color:#d07711;>'
 </span><span style=color:#b3933a;>2024</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>07</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>31 16</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>09</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>53
+</span></code></pre><p>You can also provide an input file for conversion using the <code>-f</code> option:<pre class=language-ruby data-lang=ruby style=background-color:#f5f5f5;color:#1f1f1f;><code class=language-ruby data-lang=ruby><span>$ cat epochs.txt
+</span><span>@</span><span style=color:#b3933a;>0000000000
+</span><span>@</span><span style=color:#b3933a;>1234567890
+</span><span>@</span><span style=color:#b3933a;>2222222222
+</span><span>
+</span><span style=color:#7f8989;># recall that the -u option gives you UTC
+</span><span>$ date </span><span style=color:#72ab00;>-</span><span>u </span><span style=color:#72ab00;>-</span><span>f epochs.txt </span><span style=color:#72ab00;>+</span><span style=color:#d07711;>'</span><span style=color:#aeb52b;>%F %T</span><span style=color:#d07711;>'
+</span><span style=color:#b3933a;>1970</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>01</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>01 00</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>00</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>00
+</span><span style=color:#b3933a;>2009</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>02</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>13 23</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>31</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>30
+</span><span style=color:#b3933a;>2040</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>06</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>02 03</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>57</span><span style=color:#72ab00;>:</span><span style=color:#b3933a;>02
 </span></code></pre><br><h2 id=date-arithmetic>Date arithmetic</h2><pre class=language-ruby data-lang=ruby style=background-color:#f5f5f5;color:#1f1f1f;><code class=language-ruby data-lang=ruby><span>$ date </span><span style=color:#72ab00;>-</span><span style=color:#5597d6;>I
 </span><span style=color:#b3933a;>2024</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>08</span><span style=color:#72ab00;>-</span><span style=color:#b3933a;>02
 </span><span>$ date </span><span style=color:#72ab00;>-</span><span>d </span><span style=color:#d07711;>'+1 month 4 days'

sitemap.xml

@@ -144,7 +144,7 @@
     </url>
     <url>
         <loc>https://learnbyexample.github.io/mini/linux-date-command-examples/</loc>
-        <lastmod>2024-08-02</lastmod>
+        <lastmod>2024-08-08</lastmod>
     </url>
     <url>
         <loc>https://learnbyexample.github.io/mini/perl-oneliner-articles/</loc>