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The mount command instructs the operating system that a file system is ready to use, and associates it with a particular point in the overall file system hierarchy (its mount point) and sets options relating to its access. Mounting makes file systems, files, directories, devices and special files available for use and available to the user.
In the Linux kernel, the fat, hfs, hpfs, ntfs, and udf file system drivers support a umask mount option, which controls how the disk information is mapped to permissions. This is not the same as the per-process mask described above, although the permissions are calculated in a similar way.
These are typically used on systems that support more than one executable code format, such as systems supporting 32-bit and 64-bit versions of an instruction set. Such directories are optional, but if they exist, they have some requirements. /media: Mount points for removable media such as CD-ROMs (appeared in FHS-2.3 in 2004). /mnt
Name Description arch: Prints machine hardware name (same as uname -m) basename: Removes the path prefix from a given pathname chroot: Changes the root directory date: Prints or sets the system date and time dirname: Strips non-directory suffix from file name du: Shows disk usage on file systems echo: Displays a specified line of text env
In a Usenet post from 2000, Dennis Ritchie described these later versions of Research Unix as being closer to BSD than they were to UNIX System V, [1] which also included some BSD code: [2] Research Unix 8th Edition started from (I think) BSD 4.1c, but with enormous amounts scooped out and replaced by our own stuff. This continued with 9th and ...
An implementation of union mounting was added to the BSD version of Unix in version 4.4 (1994), taking inspiration from these earlier attempts, Plan 9 and the stackable file systems in Spring (Sun, 1994). [1] 4.4BSD implements the stack-of-directories approach outlined above. As in Plan 9, operations traverse this stack top-down to resolve ...
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