Working directory
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For computer operating systems that support a hierarchial file system, the working directory is the directory path that a user or program has designated to be the directory for files referenced by name only, or by a relative path (as contrasted with using both a file's name and a designation of the location using a fully resolved file path).
In DOS and UNIX, a user may use the cd or chdir command to change the current working directory.
In UNIX, the pwd command will print the present working directory.
The POSIX C function chdir() can be used to set the current working directory.