How do we create a shell? Post: 302137165

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Top Forums Shell Programming and Scripting How do we create a shell? Post 302137165 by wraith on Sunday 23rd of September 2007 07:04:00 AM

09-23-2007

Registered User

How do we create a shell?

Alright. I hate to be "that guy" but i seriously need some guidance with creating a UNIX shell. I have it as an assignment for my current sem. We are expected to use C and the shell should be capable of executing around 20 basic commands that we use in UNIX.

I am seriously lost with this. I've read a tutorial about using system calls such as execve, fork, wait, etc. but that was implemented using java. Since i don't really know java, that didn't help with anything other than giving me a vague idea about what i have to do.

Can anyone help? Any kind of C specific tutorial would be highly appreciated. If there's anyone who could point me in the right direction and suggest some reading which might directly or indirectly help me in my efforts, then that would be great too.

Thanks a lot...

wraith

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LEARN ABOUT OPENSOLARIS

times

times(1)							   User Commands							  times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

	   1.	  Variable assignment lists preceding the command remain in effect when the command completes.

	   2.	  I/O redirections are processed after variable assignments.

	   3.	  Errors cause a script that contains them to abort.

	   4.	  Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a
		  variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file  name  genera-
		  tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.11							    15 Apr 1994 							  times(1)