#Lines 836 to 883 on /initrd/init (tharpup - puppylinux) - https://www.pearltrees.com/s243a/initrd-init/id19535893/item224278321
#Lines 896 to 944 of https://github.com/puppylinux-woof-CE/woof-CE/blob/c96d661c2232caef1d69c693de673fb0e54796f8/initrd-progs/0initrd/init#L896 (13 Mar 2018)

#pmedia= usbflash|usbhd|usbcd|ataflash|atahd|atacd|atazip|scsihd|scsicd|cd
[ $pmedia ] && PMEDIA=$pmedia #boot parameter, broad category of boot media. ex: cd.
[ $psubdir ] && PSUBDIR=$psubdir #boot parameter, directory for puppy files. ex: puppy220
[ $psavemark ] && PSAVEMARK=$psavemark #100913 partition number that has/will-have save-file.

[ $PSUBDIR ] && [ "${PSUBDIR:0:1}" != "/" ] && PSUBDIR="/${PSUBDIR}" #add leading /.

[ $pdev1 ] && PDRV=$pdev1 #boot parameter, partition have booted off. ex: hda3
#100915 requested by technosaurus (formats get changed further down)...
[ $pdrv ] && PDRV=$pdrv #format partition:<path><filename> ex: sda2:/slacko/puppy_slacko_6.3.0.sfs
[ $pupsfs ] && PDRV=$pupsfs
[ $zdrv ] && ZDRV=$zdrv #ex: sda2:/slacko/zdrv_slacko_6.3.0.sfs
[ $fdrv ] && FDRV=$fdrv
[ $adrv ] && ADRV=$adrv
[ $ydrv ] && YDRV=$ydrv
#<partition>:<filename>, for savefile/savefolder. <partition> can be a name or Label or UUID
[ $psave ] && PSAVE=$psave #ex: sdb4:/puppy/tahr/tahrsave or smark or 49baa82d-8c69:tahrsave
#list of kernel modules to load, ex: pimod=hid-logitech-dj.ko,kernel/drivers/hid/hid-multitouch.ko 
[ $pimod ] && PIMOD=$pimod
#specify partition for Underdog Linux (refer also underdog.lnx).
[ $underdog ] && UNDERDOG=$underdog
#[ $pdebug ] && PDEBUG=$pdebug

PDEBUG=1
TOTAL_SIZEK_SFS_RAM=0

# show menu with pupsaves
[ $psavemenu ] && PSAVEMENU=$psavemenu

RDSH=""
if [ "$pfix" ];then
 for ONEFIX in $(echo -n "$pfix" | tr ',' ' ')
 do
  case $ONEFIX in
   ram)     PRAMONLY="yes";;      #run in ram only (do not load ${DISTRO_FILE_PREFIX}save).
   rdsh)    RDSH="yes";;          #exit to shell in initial ramdisk.
   nox)     PNOX="yes";;          #do not start X.
   clean)   PCLEAN="yes";;        #force version upgrade and cleanup.
   trim)    PTRIM="yes";;         #add "discard" to mount options if SSD
   copy)    PCOPY="yes";;         #copy .sfs files into ram.
   nocopy)  PNOCOPY="yes";;        #do not copy .sfs files into ram (default is copy if enough ram).
   fsck)    PFSCK="yes";;         #do a fsck of ${DISTRO_FILE_PREFIX}save file.
   fsckp)   PFSCKP="yes";;        #do fsck before first mount of ext partitions
   [0-9]*)  PIGNORELAST=$ONEFIX;; #blacklist last $ONEFIX folders (multisession).
   psavebkp)PSAVEBKP='yes';;      #don't ignore pupsaves created by Pupsave Backup
   *)       echo "pfix=$ONEFIX is not a known boot parameter";;
  esac
 done
fi