heh. score one more for the *nix cmdline utils :)

Just for sake of argument/exercise, even if there was only -c i would still do it on the cmdline (also, these are handy if you want lines that show up N times since -u only helps if N==1): 
 
# using perl:
uniq -c /tmp/d | perl -ne '($n,$s)=split(/\t/,$_,2); print $s if $n ==
+ 1'

# using grep/cut (make sure that's a real tab after the 1 in the grep)
uniq -c /tmp/d | egrep '^ *1       ' | cut -d\t -f2

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In reply to Re^3: removing non-duplicates by davidrw
in thread removing non-duplicates by Anonymous Monk

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