Posts tagged Bash
Check your IP periodically with a small shell script
Jul 2nd
For those who are subject to dynamically assigned DSL IP, you would probably be familiar with a site such as http://myip.dk
Here is a small script I use to fetch my public IP for other script processes
updated “due to changes on the site myip.dk, I rewrote the script”
#!/bin/bash
link=`lynx -dump -listonly ‘http://myip.dk’ | awk -F: ‘/myip.dk/ && $0 != “” { getline; print $0}’ | awk -F ” ” {‘print $2′}`
curl -s $link | grep ‘”Box”‘ | egrep -o ‘[0-9.]+’
curl -s en.myip.dk | grep ‘”Box”‘ | egrep -o ‘[0-9.]+’
You may run it in a cron and email you your IP whenever it changes from the last fetch one and update your firewall rules accordingly…
Cheers,
Quick Script to monitor a process
Oct 22nd
There are numerous programs such as monit which are widely used as to monitor processes and take certain actions in case of different events.
Here is a little tip as to quickly monitor an service/process if you aren’t wanting to go through the hassle to configure monit
#!/bin/bash
r=$(ps cax |grep -c NAME_PROCESS)
if [ $r -eq 0 ]; then
service NAME_PROCESS restart
echo “NAME_PROCESS has crashed” | mail -s “monitoring SERVERID” your_Email_Address
fi
Save this as an executable, set up a cron and voila 
Good luck,