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Perl One-Liner

You don't have to know Perl to use Perl. The command-line perl -p -i -e 's/oldstring/newstring/g' * replaces all occurrences of oldstring with newstring in all files in the current directory and makes backup copies of the original files.
Fatal error: Call to undefined function aa_author_bios() in /opt/apache/dms/b2b/linux-mag.com/site/www/htdocs/wp-content/themes/linuxmag/single.php on line 62