86 lines
4.9 KiB
HTML
86 lines
4.9 KiB
HTML
<!DOCTYPE html>
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<title>md5sum 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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<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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<div class="name">
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__ _______________________ _________._________________________
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\_ _____/ \______ \ / _ \ / _____/ / _____/ | | \_ _____/
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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">md5sum 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>md5sum</code>, a tool to compute and verify MD5 checksums.
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MD5 is considered cryptographically broken; use it only for legacy integrity checks, not for security.
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</p>
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<h2>Basic usage</h2>
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<ul>
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<li><code>md5sum file.iso</code> – print MD5 hash and filename.</li>
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<li><code>md5sum file1 file2 file3</code> – hash multiple files.</li>
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<li><code>echo -n "test" | md5sum</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 MD5 sums from a file.</li>
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<li><code>--tag</code> – create BSD-style output (<code>MD5 (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>md5sum file.iso > file.iso.md5</code> – save checksum.</li>
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<li><code>md5sum file1 file2 > checksums.md5</code> – create checksum list.</li>
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<li><code>md5sum -c file.iso.md5</code> – verify a single file.</li>
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<li><code>md5sum -c checksums.md5</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>Use <code>sha256sum</code> or <code>sha512sum</code> for security-sensitive integrity checks.</li>
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<li>When hashing from <code>echo</code>, remember <code>-n</code> to avoid including the newline.</li>
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<li>Checksum files are just text; you can version them in git or share them alongside downloads.</li>
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</ul>
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</div>
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</div>
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