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ypxfrd is needed on the NIS master only if there are NIS slave servers that are configured to pull copies from the NIS master by means of ypxfr command
in crontab; also needed if a new slave server...

I don't think it's a RedHat issue. Are you using ESX or Workstation for testing? In either case, shutdown the vm. Remove the virtual NIC from the vm config and then re-add it. Do make sure that the...

I would also seriously recommend NOT using Red Hat 9 for your testing. As it has been end of lifed and support has been terminated, I would suggest you go with a distribution that is not 9 years old...

You can also edit the /etc/sudoers file and allow specific users to shutdown or reboot the system .Something like that .
## Allows members of the users group to shutdown this system
# %users ...

Can be further improved by including the colon in the grep (this allows for users with similar names like "jack" and "jackie":
output=`grep \^"${USER}:" /etc/passwd | cut -d: -f1`


Beware. On...

Instead of calling the "ADD" function again, use continue

...
if [ "$output" = "$USER" ]
then
echo " Opps ! $USER is already exist Please Enter again"
## Call ADD Function...