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sort <filename> | tail -1

Add the following line to .bashrc (assuming count_0.1 is in your home directory)
alias count='~/count_0.1'

To call count_0.1 from bin as count
ln -s ~/count_0.1 /usr/bin/count

For using your...

find /tmp/ -name AB* -o -name CA* -cmin +120 -exec rm -fr {} \;

Alternatively

find /home/hari -type f -size 0 -exec rm {} \;