WHAT IS COMMAND LINE IN KEIL? HOW TO PASS PARAMETER VIA IT? FOR COMPILING PROGRAM BY --C99 WHICH PARAMETER HAS TO BE SET
Go to your Keil\C51_905\C51\Hlp\ folder, and locate the GS51.chm file; it is the Keil Getting Started User's Guide for 8051 Microcontrollers.
You will also need to study the other tool Manuals:
http://www.keil.com/support/man_c51.htm
In particular, take time to work through the examples in the uVision manual:
http://www.keil.com/support/man/docs/uv4/uv4_examples.htm
Note that tool manuals are not beginner's guides - they assume that the user is already familiar with at least the basics of PC operation, microcontrollers, programming, embedded development, etc.
For basic study, see:
http://www.keil.com/books/
http://www.8052.com//tutorial
www.8052.com/.../187976