Hi all,

I've ran a CentOS 5 for which i want to change the hostname by script.
the desired clue is to replace the previous hostname with the one which asked from the user who executing the script. below is content of /etc/hosts.

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 example.domain.com example localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6

how to process the "example.domain.com" "example" using awk command and replace with new one?

What have you tried? This is a fairly trivial problem. Hint: each name you have quoted is a field.

so, how to determine the specified fields in the text?!

Assuming I understand what you mean here, from your example:

"example.domain.com" - $2
"example" - $3