maggicl/theshell.ch
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Intermediate group: added commands sync and base64

Browse Source 
git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@186 a672b425-5310-4d7a-af5c-997e18724b81
This commit is contained in:
devitg 2018-11-14 19:15:14 +00:00
parent faf9c98dde
commit aa294c5cfc
2 changed files with 75 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
site/pages/cmd/interm/base64.html Normal file
View File

@ -0,0 +1,56 @@
---
layout: page
category-title: Intermediate commands
category-page: intermediate
tags: base64 representation
author: Gianmarco De Vita
title: Base64
previous-page:
next-page:
---
<p><i>Base64</i> is an encoding system that allows the translation of binary
data into ASCII text strings, basing upon 64 different ASCII characters.
Each <i>Base64</i> digit represents exactly 6 bits of data so, for example,
six bytes (a total of 48 bits) can be represented by eight <i>Base64</i> digits.</p>
<p>By writing the command <code>base64</code> you can encode and decode Base64 data.
The command follows the structure:</p>
<pre>
Device-name:Current-position username$ base64 [flag] [-i input item] [-o output item]
</pre>
<h3>Defining input and output files</h3>
<p>In this case, flag such as <code>-i</code> and <code>-o</code> are fundamental
to define respectevely from which file take the stream and into which to store
the result. Naturally, the path and the name of the files must be specified.</p>
<pre>
Device-name:Current-position username$ base64 -i path/input.file -o path/output.file
</pre>
<h3>Insert line breaks</h3>
<p>Using the <code>-b</code> (which stands for <i>break</i>) flag followed by a
number, line breaks are added every specified "number" characters.</p>
<pre>
Device-name:Current-position username$ base64 -b number path/input.file path/output.file
</pre>
<p>By leaving the number field empty, an unbroken stream will be generated.</p>
<h3>Decode Base64</h3>
<p>Using the <code>-D</code> flag (which stands for decode), you obtain as
output the input message decoded into binary data.</p>
<pre>
Device-name:Current-position username$ base64 -D [-i input item] [-o output item]
</pre>
<h3>Summarize the tools</h3>
<p>Using the <code>-h</code> (which stands for <i>help</i>) a short paragraph
in which are listed the flags with the respective paragraph will be displayed.</p>
<pre>
Device-name:Current-position username$ base64 -h
</pre>

19
site/pages/cmd/interm/sync.html Normal file
View File

@ -0,0 +1,19 @@
---
layout: page
category-title: Intermediate commands
category-page: intermediate
tags: sync disk write completion
author: Gianmarco De Vita
title: sync
previous-page: pages/cmd/interm/
next-page: pages/cmd/interm/
---
<p>The <code>sync</code> utility force the completion of pending disk writes.</p>
<pre>
Device-name:Current-position username$ sync
</pre>
<p>This command can be used to verify that there are no pending disk writes,
so that all the operations are completed, before the processor is stopped by other
commands.</p>