linux - remove duplicated values of a specific parameter in bash in a file -


i have file

cat file ab,12 ab,45 ab,23 bh,32 bl,12 ab,10 bh,13

and file has duplicated lines first parameter

i need output unique values of specific parameter separated comma

for example output

cat file ab,12 bh,32 bl,12

the following command works example: 

sort -u -s -t, -k1,1

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