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Set file, directory and device permissions: File, directory and device permissions can be set to allow or deny access to members of their own group or all others. Modification of file, directory and device access is achieved with the chmod command. The permissions can be assigned in octal notation or in the more easily recognized character format where the command form is: chmod [ugoa][+-=][rwxXst] fileORdirectoryName Note: Other file systems can be mounted by Linux which support more file and directory options.
There are several options available to increase the security for each individual shared directory. Using the [share] example, this section will cover some common options. Groups define a collection of computers or users which have a common level of access to particular network resources and offer a level of granularity in controlling access to such resources.