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chmod is used to change the commonly used read, write, and execute permissions on files. It can change these permission bits for the file owner, the file's group owner, and everyone else. It can also change the more esoteric ‘permissions’ (attributes, reall) like set-user-ID, set-group-ID, and sticky bits.

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A process is run with a uid ang a gid. Both have permissions assigned to them. You could call chroot with a userspec of a user and group, where actually the user is not in that group. The process woul …
answered May 29 '15 by chaos