dpkg --compare-versions

["Marco d'Itri" <md@linux.it>]

I need to run some commands in the postinst of ifmail only if the user
is upgrading a previous. I tried:

if [ "$1" == "upgrade" -a -n "$2" -a "$2" != "<unknown>" ]; then
  if dpkg --compare-versions $2 le 2.12tx8.6; then
[...]
  fi
fi

but it does not works, I think the first test is wrong.
Does someone has a working example?

-- 
ciao,
Marco


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