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Non Duplicates

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# 1  
Old 02-27-2009
Non Duplicates
I have input file like below.


I00789524 0213 5212
D00789524 0213 5212
I00778787 2154 5412

The first two records are same(Duplicates) except I & D in the first character. I want non duplicates(ie. 3rd line) to be output. How can we get this . Can you help. Is there any single AWK or SED command.
# 2  
Old 02-27-2009
Do you need it to be awk/sed?

Code:
[rick@kangaroo ~]$ cat test.dat
I00789524 0213 5212
D00789524 0213 5212
I00778787 2154 5412
[rick@kangaroo ~]$ uniq -u -s1 test.dat
I00778787 2154 5412
[rick@kangaroo ~]$

# 3  
Old 02-27-2009
Thanks for your quick reply. Happy with that.If it can be handled in awk or SED, please let me know.
# 4  
Old 02-27-2009
Quote:
Originally Posted by awk_beginner
Thanks for your quick reply. Happy with that.If it can be handled in awk or SED, please let me know.
One way with awk:

Code:
awk 'NR==FNR{a[substr($0,2)]++;next} a[substr($0,2)]==1' file file

Regards
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