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( [id://3333]=superdoc: print w/replies, xml ) Need Help??
Take a look to eof
In a while (<>) loop, eof or eof(ARGV) can be used to detect the end of each file, whereas eof() will detect the end of the very last file only.

Update: try this not tested version
 perl -walne '$;="\t";$i||=0;$h{$i,$F[0]}.="$F[1]" } continue { $i++ if eof; END{print "$_:\t" . $h{$_} for sort keys %h}' file1.txt file2.txt

Seems OK

$ perl -MO=Deparse -walne '$;="\t";$i||=0;$h{$i,$F[0]}.="$F[1]" } cont +inue { $i++ if eof; END{print "$_:\t" . $h{$_} for sort keys %h}' fil +e1.txt file2.txt BEGIN { $^W = 1; } BEGIN { $/ = "\n"; $\ = "\n"; } LINE: while (defined($_ = <ARGV>)) { chomp $_; our(@F) = split(' ', $_, 0); $; = "\t"; $i ||= 0; $h{join $;, $i, $F[0]} .= "$F[1]"; } continue { ++$i if eof; } sub END { print "${_}:\t" . $h{$_} foreach (sort keys %h); } -e syntax OK

In reply to Re: How to supply to input files at command line by brx
in thread How to supply two input files at command line by ZWcarp

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