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Are there any scripts that can convert between text (e.g. <hi>) and the html entities version (&lt;hi&gt;) like this website does? Or at least a PHP file?

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I'm not sure what "html entities version" means. Can you elaborate on how this differs from regular html conversioni? If you just want a text to html coverter, a quick search shows txt2html.sourceforge.net. – Faheem Mitha May 25 '11 at 16:03

4 Answers

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The perl CGI module has a escapeHTML function that makes it pretty easy:

perl -e 'use CGI qw(escapeHTML); print escapeHTML("<hi>\n");'

Or to do an entire file:

perl -p -e 'BEGIN { use CGI qw(escapeHTML); } $_ = escapeHTML($_);'  FILENAME
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up vote 1 down vote

xmlstarlet can do it both ways:

echo '<em>Ampersands & angle brackets need to be encoded.</em>' |
xmlstarlet esc | 
xmlstarlet unesc
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I'm not sure of your original goal/purpose, but if you are wanting to show PHP source to someone --

You can rename the file to *.phps extension and (in many Apache/PHP configurations, but not all) it will not parse the PHP when serving the file to the user; it will show the source directly.

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I don't think this is what he wants; he wants either a command-line tool or a PHP script that will take text input and escape HTML entities – Michael Mrozek♦ May 25 '11 at 20:18
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The recode utility supports HTML as one of the encodings. (You can even specify an HTML version.) In the text-to-entities direction, it will also recode non-ASCII characters into entities; you need to specify the correct input encoding (e.g. ASCII, latin1, utf-8, …).

recode utf8:html <input-file.txt >output-file.txt
recode l1..html file-to-recode.txt
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