Your solution also breaks down if there is punctuation in the file. (OS HP-UX 11.0)
File
This is a test file. How many unique words are in this
file? Do you know? Does the file contain more than
ten words?
Results
1
1 a
1 are
1 contain
1 do
1 does
1 file
1 file.
1 file?
1 how
1 in
1 is
1 know?
1 many
1 more
1 ten
1 test
1 than
1 the
2 this
1 unique
1 words
1 words?
1 you
Update: Changed the test file.
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