The "l" option to the lpoption command is your friend for getting color saturation or duplexing to suit your needs correctly....
$ lpoptions -d AutoPrintViaCron -l
MediaType/Media Type: PLAIN_HIGH PLAIN_NORMAL *PLAIN_DRAFT PLAIN_SUPERDRAFT LETTERHEAD_HIGH LETTERHEAD_NORMAL LETTERHEAD_DRAFT LETTERHEAD_SUPERDRAFT RECYCLED_HIGH RECYCLED_NORMAL RECYCLED_DRAFT COLORPAPER_HIGH COLORPAPER_NORMAL COLORPAPER_DRAFT PREPRINTED_HIGH PREPRINTED_NORMAL PREPRINTED_DRAFT PREPRINTED_SUPERDRAFT PMMATT_HIGH PMMATT_NORMAL PLATINA_HIGH PLATINA_NORMAL PMPHOTO_HIGH PMPHOTO_NORMAL PSGLOS_HIGH PSGLOS_NORMAL ENV_HIGH ENV_NORMAL THICK_HIGH THICK_NORMAL
Ink/Grayscale: *COLOR MONO
Duplex/Duplex Tumble: *None DuplexNoTumble DuplexTumble
PageSize/Media Size: A4 TA4 4X6FULL T4X6FULL 2L T2L A6 A5 B5 L TL INDEX5 8x10 T8x10 4X7 T4X7 ENV10 ENVC6 *Letter TLetter Legal
InputSlot/Paper Source: *Auto Cassette1 Cassette2 Rear
Here is the script I use to keep my inkjet flowing smoothly twice a week:
#!/bin/sh
#
#/usr/bin/lp -d AutoPrintViaCron -o MediaType=PLAIN_HIGH /home/tim/Documents/inkFlushChart$((1 + RANDOM % 3)).pdf
# Notice the RANDOM usage above does NOT work in debian use the following
# shuf command instead to randomize among three different placements formats
# on your page in my case: upper middle or bottom of page.
/usr/bin/lp -d EPSON_ET_4760_Series -o MediaType=PLAIN_HIGH -o ColorModel=Color /home/tim/Documents/inkFlushChart$(shuf -i 1-3 -n 1).pdf
Here is an example cron command line I wrote to keep my ink jet system clog free without having to remember to print to it twice a week:
# nozzle flush sunday morning and wednesday afternoon...
#
0 7 * * 0 /home/tim/bin/inkjetnozzleflush.sh 2>&1 > /tmp/cron1.txt
0 13 * * 3 /home/tim/bin/inkjetnozzleflush.sh 2>&1 > /tmp/cron1.txt
pdf content....
