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git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@219 a672b425-5310-4d7a-af5c-997e18724b81
59 lines
1.3 KiB
HTML
59 lines
1.3 KiB
HTML
---
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layout: page
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category-title: Intermediate commands
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category-page: intermediate
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tags: sha sums check
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author: Gianmarco De Vita
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title: shasum
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previous-page: pages/cmd/interm/
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next-page: pages/cmd/interm/
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---
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With <code>shasum</code> command you can work with SHA Checksums.
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<pre>
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shasum [flag] [file]
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</pre>
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<h3>Store the Checksum</h3>
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You can store the output in a file by adding to the command line the string
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output symbol ">" and then the path and the name of the file.<br>
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<h3>Define the algorithm</h3>
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The flag <code>-a</code> allows you to choose which algorithm to use when
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defining the checksum of a file. The default algorithm is 1.
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<pre>
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shasum -a algorithm file
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</pre>
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<h3>Read in binary mode</h3>
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The flag <code>-b</code> allows you to read files in binary mode.
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<pre>
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shasum -b file.bin
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</pre>
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<h3>Check two SHA sums</h3>
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You can verify wheter two checksums belong to the same file or not (and so
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define wheter the two files are the same thing) wit the flag <code>-c</code>.
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After storing the Checksums into two files (let say file1 and file2),
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you can write to command as follows:
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<pre>
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shasum -c shaSum1 shaSum2
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</pre>
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<h3>Display help</h3>
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Writing the command followed by the <code>-h</code> h flag will display a little
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help paragraph with the main functions of this command.
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<pre>
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shasum -h
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</pre>
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