The below script will check the hard disk space usage, using the command du and send an email alert if any of the partition is using more than 85% of space. vim disk-usage.sh #!/bin/sh df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output; do echo $output usep=$(echo $output | awk '{ print ...

In Ubuntu we don't have a mechanism to start or stop iptables or we don't have a mechanism to restore iptables after restarting the system. Now we will see how to create a script for start and stop iptables also to make the script to start on system startup. 1. Create a Firewall script  vim /etc/set_iptables.bash echo 1 > ...