2002-02-18 00:00:00 +00:00
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<!DOCTYPE html PUBLIC "-//W3C/DTD HTML 3.2 Final//EN">
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2001-01-15 00:00:00 +00:00
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<html><head>
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<title>BVI: Bit-wise Operations</title>
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<link rel=stylesheet type="text/css" href="bvi.css">
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<a class="thl" href="index.html">Home</a><br>
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<a class="thl" href="quick.html">Quick Tutorial</a><br>
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<a class="ths" href="qt_edit.html">Editing Files</a><br>
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<a class="ths" href="qt_search.html">Search Commands</a><br>
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<font color="#ffffff" class="ths">Bit-wise Operations<br></font>
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<a class="ths" href="qt_find.html">Find and Replace</a><br>
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<a class="thl" href="bmore.html">bmore</a><br>
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<a class="thl" href="german.html">Deutsche Beschreibung</a><br>
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</td>
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<td width="1%"><img src="gif/dot.gif" width="40" height="1"></td>
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<td width="99%">
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<table width="100%" cellspacing="0" cellpadding="0" border="0">
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<tr><td width="99%">
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<font class="head">Quick Tutorial</font>
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<br><font class="sub">Bit-wise Operations</font>
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</td>
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<td align="right" valign="bottom" width="116" rowspan="2">
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<a href="index.html">
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<img src="gif/bvi_s.gif" alt="BVI" width="116"
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height="62" border="0"></a>
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</td></tr>
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<tr><td valign="bottom">
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<hr noshade>
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</td></tr></table>
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<p>
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To perform logical operations, bvi has a set of bit-level commands.
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The following commands are available:
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<CENTER><TABLE>
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<TR><TD><B>:rl </B><I>n</I></TD><TD>rotate left</TD><TD ROWSPAN=4>
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<I>n</I> is a number from 1 through 7</TD></TR>
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<TR><TD><B>:rr </B><I>n</I></TD><TD>rotate right</TD></TR>
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<TR><TD><B>:sr </B><I>n</I></TD><TD>shift right</TD></TR>
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<TR><TD><B>:sl </B><I>n</I></TD><TD>shift left</TD></TR>
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<TR><TD><B>:and </B><I>i</I></TD><TD>and operation</TD><TD ROWSPAN=4>
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<I>i</I> is a number from 0 through 255</TD></TR>
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<TR><TD><B>:or </B><I>i</I></TD><TD>or operation</TD></TR>
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<TR><TD><B>:xor </B><I>i</I></TD><TD>or operation</TD></TR>
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<TR><TD><B>:not </B></TD><TD>negates operation</TD></TR>
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<TR><TD><B>:neg </B></TD><TD>negates operation</TD></TR>
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</TABLE></CENTER>
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<P>
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The <I>i</I> value can be entered as a decimal number (0 - 255),
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a hexadecimal number with a leading zero (0 - 0ff) or a binary number,
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either with a leading B (B101) or exactly eight digits long (00000101).
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<P>
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On default the whole file is affected, but you can use the usual
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colon command address forms. In contrast to vi the addresses designate
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not line numbers but byte numbers. These addresses can be enterd in
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decimal or hexadecimal notation.<BR>
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Examples:
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<BLOCKQUOTE CLASS="examp">
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<B><TT>:100,500and 01A </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
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<B><TT>:03FA,01000or 00001000 </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
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<B><TT>:.rr 3 </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
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<B><TT>:'a,$sl 1 </TT><FONT COLOR=#AAAAAA>RETURN</FONT></B><BR>
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</BLOCKQUOTE>
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<p><font size="-1">
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alt="Back to the top">Back to the top</a>
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</font>
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<hr noshade>
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<i>Last update: Thu Jun 01 12:00:00 CEST 2000 by Gerhard Bürgmann</i>
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</td></tr></table>
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