225 lines
7.6 KiB
HTML
225 lines
7.6 KiB
HTML
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<title>sed Cheatsheet - Cheatsheets - Launch Pad</title>
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<svg class="theme-icon theme-icon-sun" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="display: none;"><circle cx="12" cy="12" r="5"></circle><line x1="12" y1="1" x2="12" y2="3"></line><line x1="12" y1="21" x2="12" y2="23"></line><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line><line x1="1" y1="12" x2="3" y2="12"></line><line x1="21" y1="12" x2="23" y2="12"></line><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line></svg>
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__ _______________________ _________._________________________
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\_ _____/ \______ \ / _ \ / _____/ / _____/ | | \_ _____/
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| __) | _/ / /_\ \ / \ ___ / \ ___ | | | __)_
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| \ | | \ / | \ \ \_\ \ \ \_\ \ | |___ | \
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\___ / |____|_ / \____|__ / \______ / \______ / |_______ \ /_______ /
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\/ \/ \/ \/ \/ \/ \/
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</div>
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<div class="blog-header-content">
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<a href="/cheatsheets" class="back-link" title="Back to Cheatsheets">
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<svg xmlns="http://www.w3.org/2000/svg" width="42" height="42" viewBox="0 0 24 24" class="home-icon"><path fill="currentColor" d="M10 20v-6h4v6h5v-8h3L12 3 2 12h3v8z"/></svg>
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</a>
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<h1 class="blog-page-title">sed Cheatsheet</h1>
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</div>
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</div>
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<div class="blog-post-container">
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<div class="blog-posts-container" style="max-width: 900px; margin: 0 auto;">
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<div class="blog-post">
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<div class="blog-post-content">
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<p><a href="index.html">← Back to cheatsheets</a></p>
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<p><a href="../index.html">← Home</a></p>
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<hr>
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<p>sed (stream editor) is a powerful text processing tool for filtering and transforming text. Edit files non-interactively, perform find-and-replace operations, and manipulate text streams efficiently.</p>
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<hr>
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<h2>Basic Usage</h2>
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<ul>
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<li>sed 's/old/new/' file - Substitute first occurrence per line</li>
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</ul>
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<ul>
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<li>sed 's/old/new/g' file - Substitute all occurrences</li>
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</ul>
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<ul>
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<li>sed 's/old/new/2' file - Substitute 2nd occurrence</li>
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</ul>
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<ul>
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<li>sed -i 's/old/new/g' file - Edit file in-place</li>
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</ul>
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<ul>
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<li>sed -i.bak 's/old/new/g' file - In-place with backup</li>
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</ul>
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<hr>
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<h2>Substitution</h2>
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<ul>
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<li>sed 's/pattern/replacement/' - Basic substitution</li>
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</ul>
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<ul>
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<li>sed 's/pattern/replacement/g' - Global substitution</li>
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</ul>
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<ul>
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<li>sed 's/pattern/replacement/i' - Case-insensitive</li>
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</ul>
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<ul>
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<li>sed 's/pattern/replacement/gi' - Global, case-insensitive</li>
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</ul>
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<ul>
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<li>sed 's|old|new|g' - Use different delimiter</li>
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</ul>
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<ul>
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<li>sed 's/old/new/; s/old2/new2/' - Multiple substitutions</li>
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</ul>
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<hr>
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<h2>Line Selection</h2>
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<ul>
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<li>sed -n '5p' file - Print line 5</li>
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</ul>
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<ul>
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<li>sed -n '5,10p' file - Print lines 5-10</li>
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</ul>
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<ul>
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<li>sed -n '5,$p' file - Print from line 5 to end</li>
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</ul>
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<ul>
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<li>sed -n '/pattern/p' file - Print matching lines</li>
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</ul>
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<ul>
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<li>sed -n '/start/,/end/p' file - Print range between patterns</li>
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</ul>
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<ul>
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<li>sed '5d' file - Delete line 5</li>
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</ul>
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<ul>
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<li>sed '/pattern/d' file - Delete matching lines</li>
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</ul>
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<hr>
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<h2>Insertion & Appending</h2>
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<ul>
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<li>sed '5i\new line' file - Insert before line 5</li>
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</ul>
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<ul>
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<li>sed '5a\new line' file - Append after line 5</li>
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</ul>
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<ul>
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<li>sed '/pattern/i\new line' file - Insert before match</li>
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</ul>
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<ul>
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<li>sed '/pattern/a\new line' file - Append after match</li>
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</ul>
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<ul>
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<li>sed '$a\new line' file - Append to end</li>
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</ul>
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<hr>
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<h2>Advanced Patterns</h2>
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<ul>
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<li>sed 's/^old/new/' - Match start of line</li>
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</ul>
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<ul>
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<li>sed 's/old$/new/' - Match end of line</li>
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</ul>
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<ul>
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<li>sed 's/old.*/new/' - Match rest of line</li>
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</ul>
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<ul>
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<li>sed 's/\(.*\)old\(.*\)/\1new\2/' - Capture groups</li>
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</ul>
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<ul>
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<li>sed 's/old/new/; t; s/old2/new2/' - Conditional</li>
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</ul>
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<ul>
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<li>sed -n 's/old/new/p' - Print only modified lines</li>
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</ul>
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<hr>
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<h2>Multiple Commands</h2>
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<ul>
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<li>sed -e 's/old/new/' -e 's/old2/new2/' file - Multiple expressions</li>
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</ul>
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<ul>
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<li>sed 's/old/new/; s/old2/new2/' file - Semicolon separator</li>
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</ul>
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<ul>
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<li>sed -f script.sed file - Read from script file</li>
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</ul>
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<hr>
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<h2>Common Examples</h2>
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<h3>Replace Text</h3>
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<pre><code>sed 's/old/new/g' file.txt</code></pre>
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<p>Replace all occurrences.</p>
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<h3>In-Place Edit</h3>
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<pre><code>sed -i 's/old/new/g' file.txt</code></pre>
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<p>Edit file directly.</p>
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<h3>Delete Lines</h3>
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<pre><code>sed '/pattern/d' file.txt</code></pre>
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<p>Remove matching lines.</p>
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<h3>Print Range</h3>
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<pre><code>sed -n '10,20p' file.txt</code></pre>
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<p>Print lines 10-20.</p>
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<h3>Add Line</h3>
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<pre><code>sed '5a\new content' file.txt</code></pre>
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<p>Insert after line 5.</p>
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<h3>Remove Empty Lines</h3>
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<pre><code>sed '/^$/d' file.txt</code></pre>
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<p>Delete blank lines.</p>
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<h3>Remove Leading Spaces</h3>
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<pre><code>sed 's/^[ \t]*//' file.txt</code></pre>
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<p>Strip whitespace from start.</p>
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<h3>Remove Trailing Spaces</h3>
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<pre><code>sed 's/[ \t]*$//' file.txt</code></pre>
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<p>Strip whitespace from end.</p>
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<h3>Number Lines</h3>
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<pre><code>sed = file.txt | sed 'N;s/\n/\t/'</code></pre>
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<p>Add line numbers.</p>
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<h3>Extract Field</h3>
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<pre><code>sed 's/.*:\(.*\):.*/\1/' file.txt</code></pre>
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<p>Extract between colons.</p>
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<hr>
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<h2>Tips</h2>
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<ul>
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<li>Use -i for in-place editing (be careful!)</li>
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</ul>
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<ul>
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<li>Use -i.bak to create backup</li>
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</ul>
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<ul>
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<li>Use -n with p to print only selected lines</li>
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</ul>
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<ul>
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<li>Use g flag for global substitution</li>
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</ul>
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<ul>
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<li>Use different delimiters (|, #) for complex patterns</li>
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</ul>
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<ul>
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<li>Combine with other tools in pipelines</li>
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</ul>
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<ul>
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<li>Test without -i first to verify changes</li>
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</ul>
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<ul>
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<li>Essential for batch text processing</li>
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</ul>
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</div>
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</div>
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</div>
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</div>
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