93 lines
4.9 KiB
HTML
93 lines
4.9 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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// Apply theme immediately to prevent flash
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<title>sha256sum Cheatsheet - Launch Pad</title>
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<svg class="theme-icon theme-icon-moon" 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"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path></svg>
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<br/><br/>
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<div class="name">
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__ _______________________ _________._________________________
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\_ _____/ \______ \ / _ \ / _____/ / _____/ | | \_ _____/
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| __) | _/ / /_\ \ / \ ___ / \ ___ | | | __)_
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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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← Back to Cheatsheets
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</a>
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<h1 class="blog-page-title">sha256sum Cheatsheet</h1>
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</div>
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</div>
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<div class="blog-posts-container">
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<div class="blog-post-content">
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<p>
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Quick reference for <code>sha256sum</code>, a tool to compute and verify SHA-256 checksums.
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SHA-256 is the common default for verifying downloads and file integrity.
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</p>
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<h2>Basic usage</h2>
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<ul>
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<li><code>sha256sum file.img</code> – print SHA-256 hash and filename.</li>
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<li><code>sha256sum file1 file2</code> – hash multiple files.</li>
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<li><code>echo -n "test" | sha256sum</code> – hash data from stdin.</li>
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</ul>
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<h2>Common options</h2>
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<ul>
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<li><code>-b</code> – read files in binary mode (default on Linux).</li>
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<li><code>-t</code> – read files in text mode (mainly for non-Unix systems).</li>
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<li><code>-c</code> – check SHA-256 sums from a file.</li>
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</ul>
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<h2>Creating and verifying checksum files</h2>
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<ul>
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<li><code>sha256sum file.img > file.img.sha256</code> – save checksum.</li>
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<li><code>sha256sum file1 file2 > checksums.sha256</code> – create checksum list.</li>
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<li><code>sha256sum -c file.img.sha256</code> – verify a single file.</li>
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<li><code>sha256sum -c checksums.sha256</code> – verify multiple files.</li>
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</ul>
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<h2>Tips</h2>
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<ul>
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<li>Publish SHA-256 hashes over HTTPS, signed release notes, or another trusted channel.</li>
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<li>Users should compare the hash they compute with the published hash, not just “it downloaded fine”.</li>
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<li>For even stronger hashes, see <code>sha512sum</code>.</li>
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</ul>
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</div>
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</div>
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</body>
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</html>
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