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Generally it's one of the functionalities of (For example) grsecurity - user sees only his own processes, and not all others.

But - I'd prefer to avoid installing grsecurity - perhaps something like this can be done in a simpler way?

I'm using Linux Debian.

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Depending on what you're trying to accomplish, you may want to look into Linux Containers:

This is a lightweight virtualization mechanism that lets you created isolated groups of resources on your Linux system. Linux containers (LXC) uses the namespace support that has been in the Linux kernel for the past several years; this page:

Has links to articles discussing various aspects of this work.

This may end up being a bigger solution than you're looking for, but it's a very interesting technology.

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