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Full Discussion: Understanding Getopts in an otherwise easy assignment
Homework and Emergencies Homework & Coursework Questions Understanding Getopts in an otherwise easy assignment Post 302892961 by Perderabo on Sunday 16th of March 2014 10:49:33 AM
Old 03-16-2014
First, you need to remember that your instructor has given you a very simple script. If everything was this simple there would be no getopts. But getopts can handle almost anything you throw at it and with more complex scripts it would be a nightmare to do it all manually.

Now in your case, it looks like "alert user" is the basic command. You have to give some user name. A command like just "alert" all by itself makes no sense. It may be that your script only handles one user... that's enough as an example to learn scripting. But in the real world it would probably be able to handle multiple users "alert user1 user2 user3 user4....". So far we have not talked about options.

You have a option called -m and it seems to require an argument. Ditto -w. So it's like this...
Code:
alert user1
alert  -m "some -m stuff" user1
alert  -m "some -m stuff" -w "some -w stuff" user1

getopts is going to handle the stuff in color. The reason getopts is in a while loop is that it is looping through the command line, word by word, left to right. After you finish absorbing the command line you should know what to do. If that involves another while loop, then you will need a second while loop.
 

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LEARN ABOUT ULTRIX

lmfsetup

lmfsetup(8)						      System Manager's Manual						       lmfsetup(8)

Name
       lmfsetup - License Management Facility PAK registration script

Syntax
       /etc/lmfsetup [ template ]

Description
       The  script allows you to register data supplied by a Product Authorization Key (PAK).  The script prompts you for the data associated with
       each of the fields on a PAK.  When all the data has been entered, the License Management Facility (LMF) ensures there are  entries  against
       all  the mandatory fields, and that the Checksum validates all the license data.  If the data has been entered correctly, the PAK is regis-
       tered in the License Database.  If the data has been entered incorrectly, the appropriate error message is displayed and you are given  the
       opportunity to re-enter the data.

       The template option allows you to register license data from templates in A template containing a partially complete PAK is created by some
       products as part of their installation process.	The script only prompts you for data on the fields that are empty in the template.  If the
       script cannot find the specified template in it searches the current directory.

       The  script  is	provided as an alternative to the command.  This displays a template, which includes the fields on the PAK, and invokes an
       editor so that you can add the license data to the appropriate field.  The command also allows errors to be corrected without having to re-
       enter all the data.

See Also
       lmf(8)
       Guide to Software Licensing

																       lmfsetup(8)
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