On 2012-05-11 03:49, Norbert Preining wrote: >> use 'le-nl' unless you want to run this on initial install ($2=""), too > > le-nl isn't that << ? 'le-nl' is '<=' with a special case for the empty version "" to be later than anything (for 'le'/'<=' it's earlier than anything, even '~', see dpkg(1)) > I guess better is > if [ -n "$2" ] ; then > if dpkg --compare-versions "$2" le "2011.20120509-1" ; then that's equivalent to le-nl, just two more lines :-) Andreas