I've asked this question before but still need a bit more help.
Occasionally, I accidentally send something to print while the
printer is turned off, and when this happens, I use lpstat to find
out what the spooled file name is and then use 'cancel Printer-nnnn'
to delete the applicable 'nnnn' numbered spooled file.
But then later, when I turn on the printer, I always get a wasted
printed page (or two) of garbage which somehow doesn't get
flushed out of the pipeline.
Someone suggested using 'lpq' to verify that the pipeline is clear,
and when I do that, I get the response: "Printer is ready" and
"no entries". So, both 'lpstat' and 'lpq' are telling me that there is
nothing in the pipeline, but they aren't telling the truth.
ps -ef shows the processes listed below that seem to pertain to the
printer. Can I safely kill these processes to flush the pipeline?
Or are there some other places (directories or folders) I can look
in my file system to find where this unwanted print residue is hiding?
root 30516 959 0 09:08 ? 00:00:00 parallel:/dev/lp0 2814 joe
STDIN 1 Contrast=1.000 Cyan=1.000 Density=1.000 GSResolution=600x600DPI
Magenta=1.000 OutputType=BlackAndWhite Quality=600dpi StpBrightness=1.000
StpGamma=1.000 StpSaturation=1.000 Yellow=1.000
lp 30519 1 0 09:08 ? 00:00:00 sh -c gs '-dSAFER'
'-dNOPAUSE' '-dBATCH' '-sDEVICE=stp' '-sModel=pcl-4' '-sOutputFile=|cat >&3'
'-' 3>&1 1>&2
lp 30520 30519 0 09:08 ? 00:00:00 /usr/bin/perl
/usr/lib/cups/filter/cupsomatic 2814 joe STDIN 1 Contrast=1.000 Cyan=1.000
Density=1.000 GSResolution=600x600DPI Magenta=1.000 OutputType=BlackAndWhite
Quality=600dpi StpBrightness=1.000 StpGamma=1.000 StpSaturation=1.000
Yellow=1.000
lp 30521 30519 0 09:08 ? 00:00:01 gs -dSAFER -dNOPAUSE -dBATCH
-sDEVICE=stp -sModel=pcl-4 -sOutputFile=|cat >&3 -
lp 30528 30521 0 09:08 ? 00:00:00 sh -c cat >&3
lp 30529 30528 0 09:08 ? 00:00:00 cat
j
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