Description: Fchdir is a system call that changes the current working directory of a process in Unix-like operating systems. This function allows programs to modify their working context, which is essential for file management and executing commands in different locations of the file system. By using fchdir, a process can change its working directory to one specified by a file descriptor, providing a more efficient and secure way to navigate the file system compared to other functions that require the use of absolute paths. This system call is part of the Unix application programming interface (API) and is fundamental to the operation of many applications and scripts that require access to files in different directories. The ability to change the working directory is crucial in multitasking environments, where multiple processes may be operating simultaneously and need to access different resources without interfering with each other.