I am trying to understand the concept of positional parameters.
I do understand that positional parameters:
1. Are initialized by shell
2. Have a max of 9 parameters ($1 to $9)
3. Have no limit on the number of arguments
4. Can be rearranged with the shift command
Can someone please give me a simple example to help me better understand how to use positional parameters?
For example, if I do the following:
How am I able to use these variables from a file within a different directory?
Is this a good example that will help me understand the concept? I am trying to write a few small examples to help me see exactly what is happening.
What about addressable parameters? Is it a max of 9 addressable parameters? I am not sure where I read this. I wrote it down as I was trying to learn more about it.
I understand that this does contradict what I originally posted for #2.
The Bourne shell does not support ${10}. Here is an example where I tried it:
The Korn shell and Bash both do support it. But not the old Bourne shell. The Bourne shell is very old. Replacements have been available since at least 1988. I don't understand why people would use it for new scripts. The Posix standard mandates a newer shell. Any version of Unix that does not have a modern shell available is in violation of the standard.
OK, after reading the linked lesson (Lesson 13: Positional Parameters), I have written a test program. This program is called "positional_parameters":
The following are the contents of the "testing" file:
I am getting the following error when I run the positional_parameters program:
Am I not initializing it correctly?
Is it possible for the mailtolist variable to contain more than one e-mail address?
I would like to try to invoke the positional_parameters program from the command line and send the contents of my testing file to my e-mail address.
Would this be the correct command?
Do I need to export mailtolist?
Do I need to use command substitution to test it?
I appreciate the feedback. I am enjoying what I am learning so far.
Thank you,
Eric
Last edited by ericelysia; 10-22-2005 at 12:05 PM..
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