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Gerhard Bürgmann 2001-01-15 00:00:00 +00:00 • committed by Vincent Batts
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<!DOCTYPE HTML PUBLIC "-//W3C/DTD HTML 3.2 Final//EN">
<html><head>
<title>BVI: Bit-wise Operations</title>
<link rel=stylesheet type="text/css" href="bvi.css">
</head><body bgcolor="#ffffff" background="gif/bg2.gif">
<a name="top"></a>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr><td width="1%" valign="top" align="center">
<img src="gif/dot.gif" width="130" height="1">
<hr noshade width="60%">
<p>
<a class="thl" href="index.html">Home</a><br>
</p>
<p>
<a class="thl" href="quick.html">Quick Tutorial</a><br>
<a class="ths" href="qt_edit.html">Editing Files</a><br>
<a class="ths" href="qt_search.html">Search Commands</a><br>
<font color="#ffffff" class="ths">Bit-wise Operations<br></font>
<a class="ths" href="qt_find.html">Find and Replace</a><br>
<a class="ths" href="qt_yank.html">Yank and Put</a><br>
<a class="ths" href="qt_set.html">Settings</a><br>
<a class="ths" href="qt_partial.html">Partial File Read</a><br>
</p>
<p>
<a class="thl" href="download.html">Download</a><br>
</p>
<p>
<a class="thl" href="install.html">Installation</a><br>
</p>
<p>
<a class="thl" href="overview.html">Command Overview</a><br>
</p>
<p>
<a class="thl" href="bmore.html">bmore</a><br>
</p>
<p>
<a class="thl" href="german.html">Deutsche Beschreibung</a><br>
</p>
<hr noshade width="60%">
</td>
<td width="1%"><img src="gif/dot.gif" width="40" height="1"></td>
<td width="99%">
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tr><td width="99%">
<font class="head">Quick Tutorial</font>
<br><font class="sub">Bit-wise Operations</font>
</td>
<td align="right" valign="bottom" width="116" rowspan="2">
<a href="index.html">
<img src="gif/bvi_s.gif" alt="BVI" width="116"
height="62" border="0"></a>
</td></tr>
<tr><td valign="bottom">
<hr noshade>
</td></tr></table>
<p>
To perform logical operations, bvi has a set of bit-level commands.
The following commands are available:
<CENTER><TABLE>
<TR><TD><B>:rl </B><I>n</I></TD><TD>rotate left</TD><TD ROWSPAN=4>
<I>n</I> is a number from 1 through 7</TD></TR>
<TR><TD><B>:rr </B><I>n</I></TD><TD>rotate right</TD></TR>
<TR><TD><B>:sr </B><I>n</I></TD><TD>shift right</TD></TR>
<TR><TD><B>:sl </B><I>n</I></TD><TD>shift left</TD></TR>
<TR><TD><B>:and </B><I>i</I></TD><TD>and operation</TD><TD ROWSPAN=4>
<I>i</I> is a number from 0 through 255</TD></TR>
<TR><TD><B>:or </B><I>i</I></TD><TD>or operation</TD></TR>
<TR><TD><B>:xor </B><I>i</I></TD><TD>or operation</TD></TR>
<TR><TD><B>:not </B></TD><TD>negates operation</TD></TR>
<TR><TD><B>:neg </B></TD><TD>negates operation</TD></TR>
</TABLE></CENTER>
<P>
The <I>i</I> value can be entered as a decimal number (0 - 255),
a hexadecimal number with a leading zero (0 - 0ff) or a binary number,
either with a leading B (B101) or exactly eight digits long (00000101).
<P>
On default the whole file is affected, but you can use the usual
colon command address forms. In contrast to vi the addresses designate
not line numbers but byte numbers. These addresses can be enterd in
decimal or hexadecimal notation.<BR>
Examples:
<BLOCKQUOTE CLASS="examp">
<B><TT>:100,500and 01A </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
<B><TT>:03FA,01000or 00001000 </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
<B><TT>:.rr 3 </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
<B><TT>:'a,$sl 1 </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
</BLOCKQUOTE>
<p><font size="-1">
<a class="btop" href="#top">
<img border="0" width="16" height="7" src="gif/up.gif"
alt="Back to the top">Back to the top</a>
</font>
<hr noshade>
<i>Last update: Thu Jun 01 12:00:00 CEST 2000 by Gerhard B&uuml;rgmann</i>
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</body></html>