how to read all the unique words in a text file

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# 1  
Old 11-30-2007
how to read all the unique words in a text file

How can i read all the unique words in a file, i used -

cat comment_file.txt | /usr/xpg6/bin/tr -sc 'A-Za-z' '/012'
cat comment_file.txt | /usr/xpg6/bin/tr -sdc 'A-Za-z' '/012'
but they didnt worked.....
# 2  
Old 11-30-2007
Does uniq somefile help?
# 3  
Old 11-30-2007
yes u will be using uniq only but the first part is not working i used -
cat comment_file.txt | /usr/xpg6/bin/tr -sdc 'A-Za-z' '/012' | sort | uniq -c
# 4  
Old 11-30-2007
This one from the archives may help. Although it shows non-unique non-unique words you would need to tweak it.
# 5  
Old 11-30-2007
thankx anyways
# 6  
Old 11-30-2007
this is the solution ---

cat comment_file.txt | tr " " "\n" | sort | uniq -c | wc -l
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