redirect output of shell script on to same window

hi,

i have a vim function which can be used to execute a shell cmd (for example 'ls')
from within vim, i want to redirect the output to a same window always, for
example, i will have two windows opened A | B. A will be my script and B will be
my output window, when i execute A, if B is not opened, open B and display the
output, if B is already there, then clear the existing contents of B and display
the new output. I hope i'm clear on the requirement, i know i have to use the commands like 'rightbot new', 'vertical new', etc, i tried all combinations but
nothing seems to be working, your help is much appreciated.

thanks
sinbad

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