28 lines
441 B
Perl
28 lines
441 B
Perl
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#!/usr/bin/perl
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use v5.26;
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sub fqdn {
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my ($h) = @_;
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if ($h =~ /\./) {
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return $h;
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}
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open(my $fh, '-|', '/usr/bin/host', $h);
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while (<$fh>) {
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if (/^(\S+\.\S+) has address/) {
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return $1;
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}
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}
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say STDERR "$0: cannot determine FQDN of $h";
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return "$h.invalid";
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}
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if (!@ARGV) {
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$ARGV[0] = `/bin/hostname -f`;
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chomp($ARGV[0]);
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}
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for my $h (@ARGV) {
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say fqdn($h);
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}
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