Guava

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html2pre
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This is a very simple filter, written in Perl, which converts ampersands and angle brackets into the appropriate HTML codes. This is useful when including program source code or HTML source in an HTML page.

The filter reads input from standard input, and writes its output to standard output. For example:
  
$ html2pre < infile > outfile

  
#!/usr/bin/perl -w
# html2txt
#
# Steve Morphet -  November 1999.
#
# Simple filter to convert ampersands and angle brackets into HTML
# codes.

while( <> ) {
  s/&/&amp;/g; # Do ampersands first 
  s/</&lt;/g;
  s/>/&gt;/g;
  print $_;
}


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