PHP short tags do not work?

If you have problem that your short tags in php do not work like eg. <? and ?> you can fix this with this command: run it as root:

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sed -i "s|short_open_tag = Off|short_open_tag = On|" /etc/php.ini
and restart your apache server over CentOS Web Panel (CWP) or with command:

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service httpd restart

I love sed from the same day i discover it.

Anyway, you may explain a little about edit a plain text instead ask users to run commands that doesnt undertand