For occasional printing, files can be sent directly to a printer device without any setup. For example, a file called sample.txt can be sent to a USB printer:

# cp sample.txt /dev/unlpt0

Direct printing to network printers depends on the abilities of the printer, but most accept print jobs on port 9100, and nc(1) can be used with them. To print the same file to a printer with the DNS hostname of netlaser:

# nc netlaser 9100 < sample.txt