Intermediate group: Added command shasum.

git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@202 a672b425-5310-4d7a-af5c-997e18724b81

site/pages/cmd/interm/shasum.html

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+---
+layout: page
+category-title: Intermediate commands
+category-page: intermediate
+tags: sha sums check
+author: Gianmarco De Vita
+title: shasum
+previous-page: pages/cmd/interm/
+next-page: pages/cmd/interm/
+---
+With <code>shasum</code> command you can work with SHA Checksums.
+
+<pre>
+shasum [flag] [file]
+</pre>
+
+<h3>Store the Checksum</h3>
+
+You can store the output in a file by adding to the command line the string
+  output symbol "&gt;" and then the path and the name of the file.
+
+<h3>Define the algorithm</h3>
+The flag <code>-a</code> allows you to choose which algorithm to use when
+  defining the checksum of a file. The default algorithm is 1.
+
+<pre>
+shasum -a algorithm file
+</pre>
+
+<h3>Read in binary mode</h3>
+The flag <code>-b</code> allows you to read files in binary mode.
+
+<pre>
+shasum -b file
+</pre>
+
+<h3>Check two SHA sums</h3>
+You can verify wheter two checksums belong to the same file or not (and so
+  define wheter the two files are the same thing) wit the flag <code>-c</code>.
+  After storing the Checksums into two files (let say file1 and file2),
+  you can write to command as follows:
+
+<pre>
+shasum -c file1 file2
+</pre>
+
+<h3>Display help</h3>
+Writing the command followed by the <code>-h</code> h flag will display a little
+  help paragraph with the main functions of this command.
+
+<pre>
+shasum -h
+</pre>