Mac OS X
How do I change hostname in Mac OS X?
Mac OS X set the hostname to xyzabc101.local. To change the hostname to imacster, run this from the terminal:
sudo scutil --set HostName imacster
After changing the hostname, check it once by running:
hostname
It will show the new hostname imacster.
How do I uninstall the current iphone SDK?
Go to the Terminal and type this command
sudo /Developer/Library/uninstall-devtools --mode=all
How do I change my MAC address?
To change your MAC address to 00:12:34:56:78:90, run this from the terminal:
ifconfig IFace down ifconfig IFace ether 00:12:34:56:78:90
Substitute IFace with your ethernet interface (it could be eth0, en1, etc)
How do I find the free disk space?
Run this:
df -h
It displays total size, used, and available disk space in terms of gigabyte and megabytes instead of the number of 512K blocks.