The traditional file access control settings for Unix (and Linux) could be altered using the "chmod" command. When selinux was added for finer-grained access control, the "chcon" utility was part of the addition. It updates the selinux security properties for a file or directory.
For more information, run the "info chcon" command on your Linux machine. Selinux itself is a complex and confusing topic, so for that I can only recommend googling for some decent literature on the subject.
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