cocoa - How to get output of shell command while its running in objective c -

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i know similar questions have been asked before, none of them have answered mine. how can verbose output of shell command running, , interact command in nstextview?

for example, lets i'm running command "emacs" inside of objective c app. shell command interactive app, , piping output think output of command when done running. want output of "emacs" while running , interact 1 if ran command in terminal. possible? if show me how it?

thanks in advance


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