Every file and directory in a POSIX file system has a unique path name. The path name specifies the position of a file or a directory within a POSIX file system and shows how it can be accessed. The path name consists of the names of all the preceding directories, starting with the root directory and the actual name of the file or the directory. In each case, the names of the directories are separated from each other by a slash. If the POSIX file system in figure 7 (POSIX file system) is the starting point, for example, then the path of the root directory to the echo file has the following name: /bin/sinix/echo
If you create a file or a directory without specifying a path, the name is always entered automatically in the current directory in which you are working.
The POSIX file path names must be no more than 1023 byte long. The file name itself must be no more than 255 characters long.