I tried to login as root but that does not work either. I configured two USB printers on the same system P1 /dev/usb/lp0 and P2 /dev/usb/lp1
I the printers are switched off and then on again sometimes the system will confuse the two printers and when a job is sent to P1 it will be printed on P2. Sometimes the system will automatically add new printers
Do not use /dev/usb/lp0 and /dev/usb/lp1 directly, since those can point to different printers on each boot.
Instead, create file /etc/udev/rules.d/10-custom.rules. Place something like this into it (should be one line, in case my mail reader wraps it when sending):
BUS="usb", SYSFS{serial}="HP1234567890", SYMLINK="printers/laser"The above example is not going to work as-is, since none of your printers has the above serial number (unless you are lucky lottery ticket winner ;-) ). Check the documentation in /usr/share/doc/udev-039/writing_udev_rules/index.html on how to find out serial number (or other uniqe properties) of your printers.
What the above will do, udev will now create /dev/printers/laser as symbolic link that will point to correct device in /dev/usb directory (either lp0 or lp1). The trick is to not specify "NAME" parameter (mentioned in the udev documentation). That way, udev will create standard devices it always creates for printers (as defined in /etc/udev/rules.d/50-udev.rules), plus your custom symbolic link as defined in 10-custom.rules file.
You can do the same for every device on your system that you want to have static name (scanners, tapes, autochangers, CD/DVD/R/RWs).
-- Aleksandar Milivojevic <amilivojevic@xxxxxx> Pollard Banknote Limited Systems Administrator 1499 Buffalo Place Tel: (204) 474-2323 ext 276 Winnipeg, MB R3T 1L7
