The isolate utility

Isolate is a program designed to run otherwise unsafe programs in a secure manner. "This utility, isolate, runs processes in a chroot-ed environment, with constrained resource limits, as a random UID, and with limited access to the X server. An isolated program ('isolatee') no longer has all the authority of your user account, but you can still enjoy its legitimate functionality. You can play even maliciously-crafted songs in an unsafely implemented music player, with greatly minimized risk to your other data." As with so many security-related programs, its original inspiration comes from Daniel J. Bernstein.

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