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
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