> However,in the source code of ps, it should have some code that to retreive 
> the COLUMN
> variable in the screen...maybe via a function in the glibc library.....
yes - this is quite sure.

> this won't be shell specific as ps can run in all shell..so is there any way 
> to
> set the COLUMN and LINES without using the enviroment variable?
well - environment variables are not shell-specific. it is a feature
integrated in the linux kernel. however, the handling of the variables
might be different in different shells.

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