The eof operator is useful here.
#!/usr/bin/env perl
use strict;
use warnings;
my $fh = \*DATA;
while(<$fh>) {
chomp;
print "<<<$_>>> is line $.";
print ", and is the last line." if eof($fh);
}
continue {
print ".\n";
}
__DATA__
line 1
line 2
line 3
This produces the following output:
<<<line 1>>> is line 1.
<<<line 2>>> is line 2.
<<<line 3>>> is line 3, and is the last line.
My purpose in copying \*DATA into $fh was just so that the remainder of my example could operate on a filehandle that is closer to what one might see in typical code.
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