PHP system(), exec(), passthru()

I know this question has probably been asked a thousand times, but I've
been looking for 3 days now and haven't found an answer that helps me.

I need to run system commands from PHP in the usr/bin/ folder. What do
I need to do, what permissions do I set to allow this?

I can do system("ls -al") or system("whoami"), but I cannot do
system("touch /usr/bin/testfile").

Any suggestions are much appreciated.

mlenglert

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