To locate and replace a string of text in a file using use the below text.

shell# vi filename

Once in vi use the following:

:%s/string/new-string/ <enter>

That will replace any instance of string with new-string.

The file located in /etc/sysconfig/networking/profiles are created by the GUI network interface management tool. These files should not be edited manually and when changes need to be made they should be made directly to the files as shown below. CentOS 5 is easy to get around from the command line and it is beneficial to understand each of the below files if you are going to manage a server.

Need to make a change to hostname?
First modify /etc/sysconfig/network and modify the following line:
HOSTNAME=your.hostname.here

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