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C:\>perl -e "system('awk \"FNR == NR { if (FNR != 1) word[$1] = $2; ne
+xt } $1 in word { print $0, word[$1] }\" DataSet2.txt DataSet1.txt')"
A 12 45 hello
...
F 10 45

C:\>

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C:\>awk "FNR == NR { if (FNR > 1) word[$1] = $2; next } $1 in word { p
+rint $0, word[$1] }" DataSet2.txt DataSet1.txt
A 12 45 hello
...
E 34 31 black

C:\>