prep \- prepare text for statistical processing
and writes it on the standard output,
A word is a string of alphabetic characters
and imbedded apostrophes,
delimited by space or punctuation.
Hyphented words are broken apart;
hyphens at the end of lines are removed and the
hyphenated parts are joined.
Strings of digits are discarded.
The following option letters may appear in any order:
Print the word number (in the input
These words will not appear in the output.
(They will be counted, for purposes of the
Only these words will appear in the output.
(All other words will also be counted for
Include punctuation marks (single nonalphanumeric characters)
as separate output lines.
The punctuation marks are not counted for the
Ignore and only files contain words, one per line.