It could be as simple as the following one-liner; 

perl 
-nle"push @{$h{$_}},$ARGV}{print qq[$_ found in @{$h{$_}}] for keys %h
+" 
1.dat 2.dat 3.dat 4.dat 5.dat 6.dat 7.dat 8.dat 9.dat 10.dat

[download]

Which produces a list like this:

name074 found in 1.dat 6.dat
name027 found in 5.dat
name002 found in 1.dat 2.dat 3.dat
name117 found in 2.dat 3.dat 4.dat
name110 found in 6.dat
name160 found in 5.dat 9.dat
name079 found in 5.dat 7.dat
name051 found in 1.dat
name022 found in 2.dat 3.dat
name100 found in 2.dat 7.dat
name061 found in 6.dat
...

[download]
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Find common lines in multiple files? by BrowserUk
in thread Find common lines in multiple files? by Anonymous Monk

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