How to write a perl script that can monitor my disk space under UNIX or Linux and send me an email alert?

There is a nice perl system routine called Perl df or Filesys::DiskSpace. This routine displays information on a file system such as its type, the amount of disk space occupied, the total disk space and the number of inodes etc.

Task: Install Filesys::DiskSpace

First you need to install this perl module using apt-get or from cpan (Comprehensive Perl Archive Network).
$ sudo apt-get install libfilesys-diskspace-perl

Perl script code to monitor disk space

Now write a perl script called df.pl:
$ vi df.pl
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Perl script to monitor disk space and send an email

Originally from nixCraft by nixcraft

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