TMTOWTDI, sometimes not even involving perl . . . 

$ for i in file[12] ; { print $i ; cat $i }
file1
Adam    1 2 3
Eve     4 5 6
file2
Adam    4 5 6
Eve     7 8 9

$ join -1 1 -2 1 file1 file2
Adam 1 2 3 4 5 6
Eve 4 5 6 7 8 9

[download]

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re: Merging two files by command line by Fletch
in thread Merging two files by command line by venciso

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