rcsinfo="$Id: unix.xml,v 1.7 2009-03-07 03:52:40 radek Exp $"

function transient  {
   remove[${#remove[*]}]=$1
}

transient remove              # remove may not be other than first transient
transient transient
...
# remove transients
i=${#remove[*]}
while [ $i -ne 0 ] ; do
   unset ${remove[--i]}
done