[plug] How to clean out the printer spool

[rhyellin]

sometimes I want to stop printing before a document has finished, or as 
recently, the printer(a HP Deskjet 500) was printing a long doc and the 
screensaver came on and the printing stopped(aborted it said)  How did this 
happen?

I needed to empty the spool to stop pages of ? Postscript stuff coming out 
when the printer is switched back on  How do I do this?

I use RH9. I don't know how to locate "lpd".  I thought it was 
"/var/spool/lp<printername>" (it's not)  Also, I tried to shutdown lpd with 
"/etc/rc.d/init.d/lpd stop" which failed  "line195: kill : 2529 operation 
not permitted".
Process 2529 is lpd.  Coukd I kill it from"ps -aux" If so, how do I restart 
lpd?
Also, how do I power cycle the printer to flush the buffer
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How do I do this.  How do I find lpd   Can anyone help please regards
richard yellin
.