how many unique lines in a file

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# 1  
Old 09-23-2009
Bug how many unique lines in a file

I have a file, test.txt with approx 12,000 lines. Each line is a single word that looks like a hex address. There are many repeats. Over half of the lines are the same. I want to count how many UNIQUE lines there are.

#>more test.txt

in this case there are 4 UNIQUE lines... How do I script this?
In other words, I need a script that only prints UNIQUE lines, then I can just wc (word count) the result.
Thank you very much!

It also might help to know that each line is a fixed amount of hex characters...the actual file that I need to count has 10 characters per line, for example 0x123456FF (so the above example isnt exact) but each line does begin with "0x" and then 8 hex characters.

Last edited by vgersh99; 09-23-2009 at 05:34 PM.. Reason: code tags, PLEASE!
# 2  
Old 09-23-2009
Something like this?

sort test.txt|uniq|wc -l

# 3  
Old 09-23-2009
With my version of sort, you can use the -u option instead of piping the sort into uniq.

sort -u file |wc -l

# 4  
Old 09-23-2009
Only awk
awk '{a[$0]++}END{print length(a)}' file

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