Automatic removal of orphaned packages after uninstallation in SliTaz

remorphan.sh

#!/bin/sh

findorphans()
{
DEPENDENCIES=""
ORPHANLIST=""

for PACKAGE in /var/lib/tazpkg/installed/*									# look at all PACKAGES installed
	do
		. $PACKAGE/receipt										# source the receipt, where the dependency informations are contained
		for DEPENDENCY in $DEPENDS									# write every dependency to a ...
			do
				DEPENDENCIES="${DEPENDENCIES}$DEPENDENCY\n"					# ... list of all packages, that installed packages depend upon in the string "DEPENDENCIES"
			done
	done

for PACKAGE in /var/lib/tazpkg/installed/*									# look at all the packages again
	do
		ORPHAN=$(basename $PACKAGE)									# select the actual package name
		if [ -z "$(echo -e $DEPENDENCIES | grep -x $ORPHAN)" ]; then 					# check if the package is part of the DEPENDENCIES list
			ORPHANLIST="${ORPHANLIST}$ORPHAN\n"							# if not, then it is an orphan and added to ORPHANLIST
		fi
	done
echo $ORPHANLIST												# ORPHANLIST is returned to the calling routine
}

unorphan()
{
NEWORPHANS=1													# set a parameter for recursive loops
while [ $NEWORPHANS = 1 ];											# check if this loop is still valid
	do
		NEWORPHANS=0											# reset to no further loops as an assumption
		ORPHANS_AFTER=$(findorphans)									# call findorphans and put all the orphans found in ORPHANS_AFTER
		for ORPHAN in $(echo -e $ORPHANS_AFTER)								# check each orphaned package stored in ORPHANS_AFTER ...
			do
				if [ -z "$(echo -e $ORPHANS_BEFORE | grep -x $ORPHAN)" ]; then			# ... if it has already been part of the orphans stored in ORPHANS_BEFORE already
					echo y | tazpkg -r "$ORPHAN"						# if not, then it is a new orphan caused by an actual removal and should be removed, too
					NEWORPHANS=1								# after a removal, new orphans could have been produced, which makes another loop necessary
				fi
			done
	done
}
														# this is the actual beginning of the script
ORPHANS_BEFORE=$(findorphans)											# call findorphans and put all the orphans found in ORPHANS_BEFORE
tazpkg -r $1													# remove the package named in the shell
unorphan													# trigger the finding and removal of new orphans
exit 0

Reference: http://forum.slitaz.org/topic/package-management-and-orphaned-packages/page/2#post-45182