a bit of what I do at work

if [ ! -f *.GO ]
 then
 if [ -d ../FilePool ]
  then
   if [ -f ../FilePool/*.GO ]
    then
    if [ `pwd | grep EDIT01` ] 
        then
        for i in `ls -1 ../FilePool/*.GO | head -1`
        do
                mv $i `basename $i .GO`.IP
                mv ../FilePool/`basename $i .GO`.GO? .
                mv `basename $i .GO`.IP `basename $i .GO`.GO
        done
        else
        for i in `ls -1 ../FilePool/*.GO | grep -v "\Z.GO" | head -1`
        do
                mv $i `basename $i .GO`.IP
                mv ../FilePool/`basename $i .GO`.GO? .
                mv `basename $i .GO`.IP `basename $i .GO`.GO
        done
    fi
   fi
 fi
fi