Can anyone suggest me web-links to learn scripting in GRASS GIS (its utilities, examples etc.) other than those available in GRASS official Wiki/Sites?
You will find few snippets on that page and also links to references (on the bottom of the page). See also Appendix 2 of that online ressource by M. Neteler. Some others examples are also available on GRASS book.
From what I know the GRASS wiki is probably one of the best resource to learn GRASS scripting.