86 lines
4.9 KiB
HTML
86 lines
4.9 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>sha1sum Cheatsheet - Launch Pad</title>
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__ _______________________ _________._________________________
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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">sha1sum 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>sha1sum</code>, a tool to compute and verify SHA-1 checksums.
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SHA-1 is considered weak for modern security; use it mostly for legacy compatibility, not new designs.
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</p>
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<h2>Basic usage</h2>
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<ul>
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<li><code>sha1sum file.img</code> – print SHA-1 hash and filename.</li>
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<li><code>sha1sum file1 file2</code> – hash multiple files.</li>
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<li><code>echo -n "test" | sha1sum</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-1 sums from a file.</li>
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<li><code>--tag</code> – create BSD-style output (<code>SHA1 (file) = hash</code>).</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>sha1sum file.img > file.img.sha1</code> – save checksum.</li>
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<li><code>sha1sum file1 file2 > checksums.sha1</code> – create checksum list.</li>
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<li><code>sha1sum -c file.img.sha1</code> – verify a single file.</li>
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<li><code>sha1sum -c checksums.sha1</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>Prefer <code>sha256sum</code> or <code>sha512sum</code> for security-sensitive uses.</li>
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<li>Use SHA-1 mainly when you must match existing ecosystems or published hashes.</li>
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<li>Keep checksum files alongside downloads so users can verify integrity easily.</li>
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</ul>
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</div>
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</div>
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