Linux Blog

Asterisk AGI IP Address lookup

Filed under: General Linux — TheLinuxBlog.com at 12:01 am on Sunday, September 19, 2010

While not exactly a shell script, I figured it would be worthy to post something rather than nothing and technically it is a script none-the-less.
I was experimenting with Asterisk AGI scripts and needed a project. I decided that an IP address lookup would be a good one. Sometimes my dynamic IP changes but my dynamic DNS doesn’t update. With this script, I should be able to dial into my Asterisk machine and get it to tell me the IP address. At least, that’s the plan.

(Read on …)

Adjust sudo timeout

Filed under: Quick Linux Tutorials — TheLinuxBlog.com at 1:05 pm on Thursday, March 5, 2009

SudoI think its pretty evident that I love sudo right? Well, what I do not like about sudo is the timeout. I understand while its there but five minutes is not exactly what I’d call an overly generous time, especially when I’m parked here at my desk for hours upon end. This tutorial shows you the line you’ll need adjust the sudo timeout:

First as root you’ll want to get into the sudo file and edit it. I’m sure you know how to do this since you’ve probably already visudo’ed your way into using sudo and are now trying to adjust the timeout. For those just reading for the sake of it, you’ll do the command: visudo

Right, now you’re there, you’ll either be in nano, pico or vi depending on your distribution. Search for the Defaults section, and put

Defaults:[your username] timestamp_timeout=[your timeout]

Replace your username with yours. Change your timeout to the number of minutes, or -1 for unlimited per session. Save and quit, then exit. Try it again, then try it again after the sudo timeout you set has changed. If it works, great news if not double check your sudoers file for another Default property that may be acting up.

Automatically reconnecting to a host

Filed under: Shell Script Sundays — TheLinuxBlog.com at 9:15 pm on Sunday, August 17, 2008

If you follow me on Twitter: http://www.twitter.com/LinuxBlog then you may know that I regularly update a bunch of Linux PC’s and servers. Now, since I’m sort of lazy and don’t like manually doing anything I don’t have to I thought I’d post the one liner I use to automatically reconnect to a host.

while ! ping -W 1 -c 1 [hostname or IP] 2>&1 >/dev/null; do true; done && sleep 15; ssh [user]@[hostname or IP]

This script uses the ping command to ping the server once (-c 1) with the timeout of 1 second (-W 1) ping a host or IP with a timeout of one second. Once the ping loop is broken (ping returns true) I let it sleep for 15 seconds to enable SSH to come up. Then the inevitable happens. I use SSH to reconnect to the host.

There you have it, a quick way to reconnect to a host without typing the command or pressing the up arrow every time. Enjoy!