You can easily change font and margin on a text file using Xlpd.
If you want to print a file without formatting, you can do so by
following the Printing PS/PCL
files section.
The print command is different among host type. For
a detailed explanation about the command and printer setup, refer
to Configuring Remote Printer.
For the usage information of the print command on your system,
please refer to the OS manual accordingly.