This may be a little more flexible for you:

#!/usr/bin/perl -w

use strict;
use warnings;

#usage: diskspace <number between 0 and 100>

my $diskuse = $ARGV[0];
my $recipient = "support\@yourdomain.com"; #who gets the report
my $dfrep = `df -k`; #get partition report
my @partitions = split(/\n/,$dfrep); # split report
my (@full, @ele, $usage, $x, $i);
my $hostname = `hostname`;
chomp($hostname);

#check syntax
unless ($diskuse > 0 || $diskuse < 100) {
 print "\nUsage:  spaceuse <n>\n";
 print "Where n is the maximum percentage of space, in use by ";
 print "any disk partition\n";
}

#check for partitions whose percent full is
#greater than or equal to the percent entered
#by the user.
foreach $i (@partitions) {
 $_ = $i;
 if (m/(\d{2})%/) {$usage = $1}
 if ($diskuse <= $usage) { push(@full,$x) }
 $x++;
}

#create and mail report
if ($#full != 0) {

 open(MAIL, "|mail -s \"Diskspace Warning\" $recipient");

 print MAIL "\nWarning from $hostname\n";
 print MAIL "These Partitions are dangerously full:\n\n";

 for (@full) {
  $_++;
  $_--; #converts scalar to numberic
  $partitions[$_] =~ s/\s+/\t/g;
  @ele = split(/\t/, $partitions[$_]);
  printf MAIL "%13s %11s %11s %11s %4s %13s\n", $ele[0], $ele[1], $ele
+[2], $ele[3], $ele[4], $ele[5];
  
 }
 close(MAIL);
}
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Neil Watson
watson-wilson.ca