awk>sort>uniq2010-04-20 00:18:54


# more test.dat
A 0
B 1
C 2
D 1
B 1
# awk '{print $1" "$2}' test.dat
A 0
B 1
C 2
D 1
B 1
# awk '{print $1" "$2}' test.dat | sort
A 0
B 1
B 1
C 2
D 1
# awk '{print $1" "$2}' test.dat | sort | uniq
A 0
B 1
C 2
D 1


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