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bvi-1.3.0.src.tar.gz
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Gerhard Bürgmann
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html/qt_edit.html
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html/qt_edit.html
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<!DOCTYPE HTML PUBLIC "-//W3C/DTD HTML 3.2 Final//EN">
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<html><head>
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<title>BVI: Editing Files</title>
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<link rel=stylesheet type="text/css" href="bvi.css">
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</head><body bgcolor="#ffffff" background="gif/bg2.gif">
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<a name="top"></a>
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<table width="100%" border="0" cellspacing="0" cellpadding="0">
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<tr><td width="1%" valign="top" align="center">
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<img src="gif/dot.gif" width="130" height="1">
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<hr noshade width="60%">
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<p>
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<a class="thl" href="index.html">Home</a><br>
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</p>
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<p>
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<a class="thl" href="quick.html">Quick Tutorial</a><br>
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<font color="#ffffff" class="ths">Editing Files<br></font>
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<a class="ths" href="qt_search.html">Search Commands</a><br>
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<a class="ths" href="qt_bit.html">Bit-wise Operations</a><br>
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<a class="ths" href="qt_find.html">Find and Replace</a><br>
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<a class="ths" href="qt_yank.html">Yank and Put</a><br>
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<a class="ths" href="qt_set.html">Settings</a><br>
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<a class="ths" href="qt_partial.html">Partial File Read</a><br>
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</p>
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<p>
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<a class="thl" href="download.html">Download</a><br>
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</p>
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<p>
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<a class="thl" href="install.html">Installation</a><br>
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</p>
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<p>
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<a class="thl" href="overview.html">Command Overview</a><br>
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</p>
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<p>
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<a class="thl" href="bmore.html">bmore</a><br>
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</p>
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<p>
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<a class="thl" href="german.html">Deutsche Beschreibung</a><br>
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</p>
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<hr noshade width="60%">
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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">Editing Files</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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Inserting or deleting bytes can be dangerous on some kind of files,
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because binary files are mostly executables, database files or maybe
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graphic files. So you must not shift the remaining bytes to another
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address.
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Therefor commands for inserting or deleting bytes are disabled by
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default.
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You can use the <B>r</B> command to change a single byte, or
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the <B>R</B> command to replace multiple characters. You can use a
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numeric prefix for both commands.
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<P>
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You can add characters at the end of the file using the <B>A</B> command.
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If you start with an empty file, you can create a binary file from
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scratch. If the cursor is in the ASCII section of the screen and you
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type <B><TT>100Ax</TT><FONT COLOR=#AAAAAA>ESC</FONT></B>, you create a file
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which contents 100 x'es.
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<P>
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The <B>D</B> command can be used to truncate a file at a certain position.
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Since there are no lines in a binary file, the <B>D</B> command deletes
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to end of file.
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<P>
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If you have to edit a binary file where it does not matter to move bytes
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to a different address, you can enable the insert and delete commands by
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typing <B>:set memmove</B>.
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Now you are able to use the <B>i</B> command for inserting bytes, the
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<B>x</B> or <B>X</B> command to delete the byte over or before the cursor
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and those types of <B>d</B> commands, which does not rely on text lines
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(e.g. <B>d<FONT COLOR=#AAAAAA>SPACE</FONT></B>, <B>df<TT>C</TT>, d/<TT>xyz</TT>,
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d$, d'a, d<TT>n</TT>G</B>).
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<P>
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All edits can be undone by pressing the <B>u</B> key.
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<H4>Using ex (colon) commands</H4>
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The edit commands of the <B>ex</B> editor are usually not available in
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standard <B>vi</B> implementations (<TT>:i[nsert], :a[ppend]</TT>
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and <TT>:c[hange]</TT>). In <B><FONT COLOR=#FF0000>bvi</B></FONT>
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they <I>are</I> available with extended options. There are five
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modifiers <TT>a[scii], b[inary], d[ecimal], h[exadecimal]</TT> and
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<TT>o[ctal]</TT> (ascii is default). Therefor you can insert, append
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or change data in all five representations.
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<P>
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<B>Example:</B><BR>
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you would like to append a file with data available in decimal
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representation:
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<BLOCKQUOTE><PRE CLASS=examp>
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:a d
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0 12 3 128 255 17 0 0 255 255
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23 24 25 128 6 6 6
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.
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</PRE></BLOCKQUOTE>
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A line with only a period (.) in it will terminate the command.
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<BR>
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You must not type values greater than a byte value (255 decimal, FF hex).
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This causes an abandon of the command.<BR>
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Pressing the <FONT COLOR=#888888>RETURN</FONT> key does <I>not</I> insert
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a newline - character into the file. If you use <B>:i a</B> (insert
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ascii) you can use the special characters \n, \r, \t and \0.
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<P>
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An additional advantage is, that all typed bytes are inserted into the
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file at once. If you insert characters in vi - mode, for every byte typed,
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the whole remaining file has to be moved one position backwards.
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<p><font size="-1">
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<a class="btop" href="#top">
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<img border="0" width="16" height="7" src="gif/up.gif"
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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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</body></html>
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