Shell Programming and Scripting

#!/usr/bin/perl

# auswipe, 5 Apr 2002
# Tested under OpenBSD 2.9
# auswipe sez : "No guarantees!"

$upperLimit = 80;              # Upper Limit in % for a File System
$mailTarget = "joe\@blow.com"; # Target for the automatic e-mail message

open(STATS, "df -h\|grep '%'|") || die "$!";

my @fileStats = <STATS>;

foreach $entryLine (@fileStats) {
  chomp($entryLine);
  $entryLine =~ s/\s+/ /g;
  my @fsStats = split(/ /, $entryLine);
  $fsStats[4] =~ s/%//g;
  if ($fsStats[4] >= $upperLimit) {
    open(MAIL, "|mail -s \"FileSystem $fsStats[0] Getting Full!\" $mailTarget ") || die "Can't open m
ail!";
    select(MAIL);
    print << "EOF";

    The FileSystem $fsStats[0] is getting full.
    Currently, the file system is ${fsStats[4]}% full. The upper
    limit has been placed at ${upperLimit}%.

    Please attend to this matter.

    -auswipe

    This message has been created automatically. Please do not respond to this message.
EOF
    close(MAIL);

  };
};
close(STATS);