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Root directory

In a computer file system, and primarily used in the Unix and Unix-like operating systems, the root directory is the first or top-most directory in a hierarchy. It can be likened to the trunk of a tree, as the starting point where all branches originate from. The root file system is the file system contained on the same disk partition on which the root directory is located; it is the filesystem on top of which all other file systems are mounted as the system boots up.

Unix-like systems
Unix abstracts the nature of this tree hierarchy entirely and in Unix and Unix-like systems the root directory is denoted by the / (slash) sign. Though the root directory is conventionally referred to as /, the directory entry itself has no name its path is the "empty" part before the initial directory separator character (/). All file system entries, including mounted file systems are "branches" of this root. Super-root Some Unix systems support a directory below the root directory. Normally, "/.." points back to the same inode as "/", however, under , this can be changed to point to a super-root directory, where remote trees can be mounted. If, for example, two workstations "pcs2a" and "pcs2b" were connected via "connectnodes" and "uunite" startup script, "/../pcs2b" could be used to access the root directory of "pcs2b" from "pcs2a". ==DOS/Windows systems==
DOS/Windows systems
Under DOS, OS/2, and Microsoft Windows, each partition has a drive letter assignment (e.g. the C partition is labeled C:\) and there is no public root directory on it. ==Related uses==
Related uses
On many Unixes, there is also a directory named (pronounced "slash root" ). This is the home directory of the 'root' superuser. On many Mac and iOS systems this superuser home directory is . ==See also==
Source: Wikipedia ↗
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