New Unix/Linux user - trying to a write a bash script to change the hostname on RHEL
 

Hi All,

I am new to Unix/Linux and I am currently in the process of learning bash shell script. I am trying to write a script, where a user/root can change the hostname by entering the prompts. The following script is not working, can anyone of you guide/help me in fixing my script. Response will be appreciated.
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#!/bin/bash
echo -n "Current host name is :"
hostname

echo -n "Enter the current hostname :"
read current_hostname

if [ $current_hostname == `uname -n` ] ; then
{
echo -n "Enter the new hostname:"
read new_hostname
sed s/$current_hostname/$new_hostname/g >/tmp/hosts_test
sed s/$current_hostname/$new_hostname/g >/tmp/network_test
}
else

echo "You have entered the wrong hostname, Please enter the valid hostname:"

fi


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Since the script is in testing mode, I copied /etc/hosts and /etc/sysconfig/network to /tmp/.
Thanks,
*unix*

Well I am probably not sure about the second echo / read as it seems like a test for the user to read from the screen and then hopefully type in the correct name??

Other than that, are you able to provide more information about:
Are there error messages?
Are the wrong files being changed?

You need to be a lot more specific as a generic 'not working' is very ambiguous.

May I firstly suggest you type each line at the command line and see what happens? (exactly what you have in your script)

Instead of trying to fix this particular script with high probability for the future questions I suggest you work through this guide about Bash scripting - answers all your questions and then some :)

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html

For example user input reading is covered in point 10.1