pslj shell-script is used to print Postscript files to a LaserJet 5L printer. If you are using another kind of printer, you can easily adapt this script by changing the DEVICE paramater to GhostScript (and possibly the resolution).
You can reference this script in your /etc/printcap file, like this (assuming you have installed the script in /usr/local/bin, with mode 755):
ps|HP LaserJet 5L as PostScript:
You need to adapt your /etc/printcap file.
This should work on any UN*X-like platform, that has an lpr style printing subsystem.
I don't use this for normal printing support anymore. I'm using cups for that now.