Permissions (1.6)

• When a file is created, the UID and GID of the creator are remembered

• Every named file has associated with it a set of permissions in the form of a string of bits:

rwxs rwxs rwx

owner group others

mode regular directory

r read list contents

w write create and remove

x execute search

s setuid/gid n/a

• setuid/gid executes program with user/group ID of file’s owner

• Use chmod to change permissions

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