Useful Linux commands:

Linux command for seeing harddrive I/O in real time:
dstat -tdD total,sda,sdb,sdc,md1 60

SSH to a server and forward back X11 commands:
ssh -X -Y *hostname*

Stop and start Gnome as needed:
service gdm stop
service gdm start

Disable Gnome from auto-start:
systemctl set-default multi-user.target
systemctl isolate multi-user.target

To re-enable:
systemctl isolate graphical.target
systemctl set-default graphical.target #it’ll setup the gdm boot startup
startx

Show size breakdown for individual directories:
du –summarize –human-readable *

Redhat’s guide to Convert2RHEL

Extra step left out of the Redhat conversion guide – Use this link if the install complains about an SSL CA path

Determining which programs opened ports on Linux

Setting up Google Voice Voicemail on a T-Mobile phone

Taken from: http://www.entropyfarm.org/things/google-voice-setup-t-mobile/

As with other things on this site, I’m lazy and hate to run into a problem that requries hours of digging through forum posts for a solution. The following is (probably) what you should do if:

• You are on T-Mobile in the USA
• You have an Android phone (this may work with others but I have no idea)
• You have a Google Voice number with voicemail set up already
• You want to use Google Voice as your voicemail instead of T-Mobile’s VM

Setup
If all of the above apply to you, the solution is fairly simple:

1. In a browser, login to your Google Voice account, and click on Settings. In the Voicemail tab, set up your greeting.
2. On your phone, install the Google Voice App.
3. From your phone’s dialer, enter * * 0 0 4 * [Your Google Voice Number] #

That’s it, pretty simple.
To disable forwarding, again from your dialer, dial: # # 0 0 4 #

Fixing corrupt read-only NTFS mounts in Ubuntu