Archiving a log file on monthly basis

Shell Programming and Scripting
1

OS : RedHat Linux 6.2
Shell : Bash

Our application write messages, warnings,..etc to the following log file .

/app/cms/diagnostics/logs/cms_messages.log

This file has become huge now. I want this file to be archived on monthly basis using a small shell script.

ie. On the 1st day of every month, cms_messages.log should be archived like

cms_messages_<previousMonth>_<Year>.log

Eg: On 1st June 2014, the current log file should be archived like

cms_messages_May_2014.log

and a fresh cms_messages.log should be created in the location /app/cms/diagnostics/logs ?

How can I do this ?

2

I think this has been covered, at least in part, many times in these forums. Show us what you have tried so far.