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<meta itemprop="description" content="cat some_file | grep some_patternI’m sure that you run a command something like above at least once if you are using terminal. You know how cat and grep works and you also know what pipe (|) does. So you naturally combine all of these to make the job done. I was also doing it this way. What I didn’t know is that grep already accepts file as an argument. So the above command could be rewritten as:grep some_pattern some_file">
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<h1 id="page-title" class="page__title" itemprop="headline">Stop cat-pipe’ing, You Are Doing It Wrong!
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<time datetime="2022-01-01T15:00:00+00:00">January 1, 2022</time>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">cat </span>some_file | <span class="nb">grep </span>some_pattern
</code></pre></div></div>
<p>I’m sure that you run a command something like above at least once if you are using terminal. You know how <code class="language-plaintext highlighter-rouge">cat</code> and <code class="language-plaintext highlighter-rouge">grep</code> works and you also know what pipe (<code class="language-plaintext highlighter-rouge">|</code>) does. So you naturally combine all of these to make the job done. I was also doing it this way. What I didn’t know is that <code class="language-plaintext highlighter-rouge">grep</code> already accepts file as an argument. So the above command could be rewritten as:</p>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">grep </span>some_pattern some_file
</code></pre></div></div>
<p>… which can make you save a few keystrokes and a few nanoseconds of CPU cycles. Phew! Not a big deal if you are not working files that contains GBs of data, right? I agree but you should still use the latter command because it will help you solve some other problems better. Here is a real life scenario: You want to search for some specific pattern in all the files in a directory.</p>
<ul>
<li>If you use the first approach, you may end up running commands like this:</li>
</ul>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>❯ <span class="nb">ls</span>
 config.lua  Git.lua  init.lua  markdown.lua  palette.lua  util.lua
 diff.lua  highlights.lua  LSP.lua  Notify.lua  Treesitter.lua  Whichkey.lua
❯ <span class="nb">cat </span>config.lua | <span class="nb">grep </span>light
❯ <span class="nb">cat </span>diff.lua | <span class="nb">grep </span>light
❯ <span class="nb">cat </span>Git.lua | <span class="nb">grep </span>light
❯ <span class="nb">cat </span>highlights.lua | <span class="nb">grep </span>light
Pmenu <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.popup_back <span class="o">}</span>,
CursorLineNr <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, style <span class="o">=</span> <span class="s2">"bold"</span> <span class="o">}</span>,
Search <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.search_blue <span class="o">}</span>,
IncSearch <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.search_blue <span class="o">}</span>,
❯ <span class="nb">cat </span>init.lua | <span class="nb">grep </span>light
<span class="nb">local </span>highlights <span class="o">=</span> require <span class="s2">"onedarker.highlights"</span>
highlights,
❯ <span class="c"># You still have a lot to do :/</span>
</code></pre></div></div>
<ul>
<li>If you use the second approach, you will immediately realize that you can send all the files with <code class="language-plaintext highlighter-rouge">*</code> operator and you will finish the job with just one command (2 if you include mandatory <code class="language-plaintext highlighter-rouge">ls</code> :D):</li>
</ul>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>❯ <span class="nb">ls</span>
 config.lua  Git.lua  init.lua  markdown.lua  palette.lua  util.lua
 diff.lua  highlights.lua  LSP.lua  Notify.lua  Treesitter.lua  Whichkey.lua
❯ <span class="nb">grep </span>light <span class="k">*</span>
highlights.lua: Pmenu <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.popup_back <span class="o">}</span>,
highlights.lua: CursorLineNr <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, style <span class="o">=</span> <span class="s2">"bold"</span> <span class="o">}</span>,
highlights.lua: Search <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.search_blue <span class="o">}</span>,
highlights.lua: IncSearch <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.search_blue <span class="o">}</span>,
init.lua:local highlights <span class="o">=</span> require <span class="s2">"onedarker.highlights"</span>
init.lua: highlights,
LSP.lua: NvimTreeNormal <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.alt_bg <span class="o">}</span>,
LSP.lua: LirFloatNormal <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray, <span class="nb">bg</span> <span class="o">=</span> C.alt_bg <span class="o">}</span>,
markdown.lua: markdownIdDelimiter <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray <span class="o">}</span>,
markdown.lua: markdownLinkDelimiter <span class="o">=</span> <span class="o">{</span> <span class="nb">fg</span> <span class="o">=</span> C.light_gray <span class="o">}</span>,
palette.lua: light_gray <span class="o">=</span> <span class="s2">"#abb2bf"</span>,
palette.lua: light_red <span class="o">=</span> <span class="s2">"#be5046"</span>,
util.lua:local <span class="k">function </span>highlight<span class="o">(</span>group, properties<span class="o">)</span>
util.lua: <span class="s2">"highlight"</span>,
util.lua: highlight<span class="o">(</span>group, properties<span class="o">)</span>
</code></pre></div></div>
<p>Isn’t this neat? You might say that <em>“This is cheating! You are using a wild card, of course it will be easier.”</em> Well, yes. Technically I could use the same wild card in the first command like <code class="language-plaintext highlighter-rouge">cat * | grep light</code> but:</p>
<ul>
<li>I figured that out only after using wild card in the second command. So I think it is does not feel natural.</li>
<li>It is still not giving the same output. Try and see the difference! <a href="##" title="You will not be able to see which file contains which line. 'cat' will just concatenate all the input.">*</a></li>
</ul>
</section>
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