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Unique sort with two fields

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# 1  
Old 04-26-2011
Unique sort with two fields
I have a file with contents below
Code:
123,502
123,506
123,702
234,101
235,104
456,104
456,100

i want to sort such that i get a unique value in column A, and for those with multiple value in A, i want the lowest value in B.

output should be
Code:
123,502
234,101
235,104
456,100

I need assistant . Thank you
# 2  
Old 04-26-2011
This should do the trick:
Code:
$ sort -n input  | awk -F, '{if($1 in a){next}else{a[$1]++;print} }'

---------- Post updated at 01:02 AM ---------- Previous update was at 01:00 AM ----------

@ scottn: Your solution fails in this case:
Code:
$ cat cols
1230,502
1230,506
123,702
123,99
234,101
235,104
456,104
456,100
$ sort  -t, -k1,1 -u cols
123,702
1230,502
234,101
235,104
456,104

Numeric sort is needed
# 3  
Old 04-26-2011
Yes, you're right, thanks Smilie Is why I deleted, undeleted, then re-deleted my post!
# 4  
Old 04-26-2011
it worked thanks
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