You're right. Normally the files will be printed on a PCL printer, but once in a while, the file will be printed to an epson printer. In this case the file will be converted to esc/p with awk. To do this the esc/p commands will be put inside the pcl comments and awk command will remove the pcl commands (comments included) and thus we will obtain an ESCP file .
Thanks for the tip.
Martin Cabrera