Script for email notifications when detecting prohibited files

Once, a vulnerability was revealed on one of the file hosting services through which an attacker could upload files to a PHP server and execute it, the vulnerability was fixed and just in case, I wrote a script that would send an email if a PHP file was found in the specified directory:

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Script to check the free space on the HDD

Usually I use Zabbix to monitor free space on the disk system, which also notifies when it is running out, but Zabbix is not used on some servers, so I wrote a small script that performs this check and sends an email notification, for example, if there is less than 12Gb of free memory:

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The script against DDOS attacks

I will give an example of a simple script against DDOS attacks for NAT servers.
The script is executed when the total number of “conntrack” connections is more than 500000, it saves to the text file the IP address which has the most “conntrack” connections, who has more than 10,000 – adds to the ipset list.

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PPS Viewer Script (Packets Per Second)

The script every second displays the number of incoming and outgoing packets per second on the specified network interface.
Place the contents of the script into a file, for example, pps.sh and execute by specifying the name of the network interface (you can stop the execution of the script with CTRL+C):

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