file-creation mode mask

a number consisting of three octal digits which is subtracted from a similar number used by the system to create files and directories.

file system

the physical or logical device that holds a collection of files and directories. This might be a hard disk drive or a partition on a disk drive.

full pathname

the name of a directory or file in relation to the root(/) directory.

See UNIX File System for a more detailed explanation.

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