The author will infrequently, if not too busy (and in a good mood), answer general scripting questions.  If you have a problem getting a particular script to work, you would be well advised to post to the comp.os.unix.shell Usenet newsgroup.
If you need assistance with a schoolwork assignment, read the pertinent sections of this and other reference works. Do your best to solve the problem using your own wits and resources. Please do not waste the author's time. You will get neither help nor sympathy. 
Likewise, kindly refrain from annoying the author with solicitations, offers of employment, or "business opportunities." He is doing just fine, and requires neither help nor sympathy, thank you.
Please note that the author will not answer scripting questions for Sun/Solaris/Oracle or Apple systems. The endarkened execs and the arachnoid corporate attorneys of those particular outfits have been using litigation in a predatory manner and/or as a weapon against the Open Source Community. Any Solaris or Apple users needing scripting help will therefore kindly direct their concerns to corporate customer service.
... sophisticated in mechanism but possibly agile operating under noises being extremely suppressed ...
--CI-300 printer manual
E-mails from certain spam-infested TLDs (61, 202, 211, 218, 220, etc.) will be trapped by spam filters and deleted unread.
Well, if you absolutely insist, you can try modifying Example A-44 to suit your purposes.