cat 4300-8.txt
|tr [A-Z] [a-z]|sed 's/[^a-z]/\n/g'|awk '/[a-z]/{print $1;}'|sort|uniq -c|awk '{print $1;}'|sort -rn|pr -n -t
# |tr "[A-Z]" "[a-z]"            # convert to lower cases
# |sed 's/[^a-z]/\n/g'       # one word per line : convert every non alpha by carriage_return
# |awk '/[a-z]/{print $1;}'  # forget empty lines
# |sort|uniq -c              # sort and count
# |awk '{print $1;}'         # just remember the count (forget the word)
# |sort -rn                  # sort numerically, descending order
# |pr -n -t                  # put a line number (=rank)