maybe try $. to catch the first line per file, like 
C:\tmp\files>perl -nE"say qq($.--$ARGV) if $.==1; $.=0 if eof " a b c
1--a
1--b
1--c

[download]

Unfortunately I need to reset $. at the end of each file, which is kind of hacky! :/

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^2: One to one file output idiom by LanX
in thread One to one file output idiom by Eily

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