401 lines
5.6 KiB
HTML
401 lines
5.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Non-interactive editing</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Bash Guide for Beginners"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="The GNU sed stream editor"
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HREF="chap_05.html"><LINK
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REL="PREVIOUS"
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TITLE="Interactive editing"
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HREF="sect_05_02.html"><LINK
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REL="NEXT"
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TITLE="Summary"
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HREF="sect_05_04.html"></HEAD
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><BODY
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CLASS="sect1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Bash Guide for Beginners</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="sect_05_02.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 5. The GNU sed stream editor</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="sect_05_04.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="sect_05_03"
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></A
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>5.3. Non-interactive editing</H1
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="sect_05_03_01"
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></A
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>5.3.1. Reading sed commands from a file</H2
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><P
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>Multiple <B
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CLASS="command"
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>sed</B
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> commands can be put in a file and executed using the <TT
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CLASS="option"
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>-f</TT
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> option. When creating such a file, make sure that:</P
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><P
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></P
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><UL
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><LI
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><P
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>No trailing white spaces exist at the end of lines.</P
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></LI
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><LI
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><P
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>No quotes are used.</P
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></LI
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><LI
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><P
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>When entering text to add or replace, all except the last line end in a backslash.</P
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></LI
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></UL
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="sect_05_03_02"
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></A
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>5.3.2. Writing output files</H2
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><P
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>Writing output is done using the output redirection operator <B
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CLASS="command"
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>></B
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>. This is an example script used to create very simple HTML files from plain text files.</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <TT
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CLASS="prompt"
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>sandy ~></TT
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> <B
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CLASS="command"
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>cat <TT
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CLASS="filename"
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>script.sed</TT
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></B
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>
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1i\
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<html>\
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<head><title>sed generated html</title></head>\
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<body bgcolor="#ffffff">\
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<pre>
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$a\
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</pre>\
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</body>\
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</html>
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<TT
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CLASS="prompt"
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>sandy ~></TT
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> <B
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CLASS="command"
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>cat <TT
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CLASS="filename"
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>txt2html.sh</TT
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></B
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>
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#!/bin/bash
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# This is a simple script that you can use for converting text into HTML.
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# First we take out all newline characters, so that the appending only happens
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# once, then we replace the newlines.
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echo "converting $1..."
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SCRIPT="/home/sandy/scripts/script.sed"
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NAME="$1"
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TEMPFILE="/var/tmp/sed.$PID.tmp"
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sed "s/\n/^M/" $1 | sed -f $SCRIPT | sed "s/^M/\n/" > $TEMPFILE
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mv $TEMPFILE $NAME
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echo "done."
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<TT
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CLASS="prompt"
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>sandy ~></TT
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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><TT
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CLASS="varname"
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>$1</TT
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> holds the first argument to a given command, in this case the name of the file to convert:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <TT
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CLASS="prompt"
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>sandy ~></TT
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> <B
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CLASS="command"
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>cat <TT
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CLASS="filename"
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>test</TT
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></B
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>
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line1
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line2
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line3
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>More on positional parameters in <A
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HREF="chap_07.html"
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>Chapter 7</A
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>.</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <TT
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CLASS="prompt"
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>sandy ~></TT
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> <B
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CLASS="command"
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>txt2html.sh <TT
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CLASS="filename"
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>test</TT
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></B
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>
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converting test...
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done.
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<TT
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CLASS="prompt"
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>sandy ~></TT
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> <B
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CLASS="command"
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>cat <TT
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CLASS="filename"
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>test</TT
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></B
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>
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<html>
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<head><title>sed generated html</title></head>
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<body bgcolor="#ffffff">
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<pre>
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line1
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line2
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line3
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</pre>
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</body>
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</html>
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<TT
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CLASS="prompt"
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>sandy ~></TT
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>This is not really how it is done; this example just demonstrates <B
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CLASS="command"
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>sed</B
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> capabilities. See <A
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HREF="sect_06_03.html"
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>Section 6.3</A
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> for a more decent solution to this problem, using <B
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CLASS="command"
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>awk</B
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> <EM
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>BEGIN</EM
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> and <EM
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>END</EM
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> constructs.</P
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><DIV
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CLASS="note"
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><P
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></P
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><TABLE
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CLASS="note"
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WIDTH="100%"
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BORDER="0"
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><TR
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><TD
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WIDTH="25"
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ALIGN="CENTER"
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VALIGN="TOP"
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><IMG
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SRC="../images/note.gif"
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HSPACE="5"
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ALT="Note"></TD
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><TH
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ALIGN="LEFT"
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VALIGN="CENTER"
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><B
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>Easy sed</B
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></TH
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></TR
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><TR
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><TD
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> </TD
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><TD
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ALIGN="LEFT"
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VALIGN="TOP"
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><P
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>Advanced editors, supporting syntax highlighting, can recognize <B
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CLASS="command"
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>sed</B
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> syntax. This can be a great help if you tend to forget backslashes and such.</P
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></TD
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></TR
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></TABLE
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></DIV
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
|
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HREF="sect_05_02.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="sect_05_04.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
|
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ALIGN="left"
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VALIGN="top"
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>Interactive editing</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="chap_05.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Summary</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |