I just started to learn unix...
and i needed to make a basic script.

i need to

1. read a file (.txt)
2. count the words of EVERY sentece
3. sentences with odd number of words need to be converted into lowercase
sentences with even number of words need to be converted into uppercase

4.the translation needs to be written into a different file

I just can't sepperate the sentences and count the words of every sentance appart.
can someone help me
thx