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Device file

In Unix-like operating systems, a device file or special file is an interface for a device driver that appears in a file system as if it were an ordinary file. There are also special files in MS-DOS, OS/2, and Microsoft Windows. They allow software to interact with a device driver using standard input/output system calls, which simplifies many tasks and unifies user-space I/O mechanisms.

Device files often provide simple interfaces to peripheral devices, such as printers and serial ports. But they can also be used to access specific resources on those devices, such as disk partitions. Finally, device files are useful for accessing system resources that have no connection with any actual device such as data sinks and random number generators.

MS-DOS borrowed the concept of special files from Unix, but renamed them devices. Because early versions of MS-DOS did not support a directory hierarchy, devices were distinguished from regular files by making their names reserved words. This means that certain file names were reserved for devices, and should not be used to name new files or directories. The reserved names themselves were chosen to be compatible with "special files" handling of PIP command in CP/M. There were two kinds of devices in MS-DOS: Block Devices (used for disk drives) and Character Devices (generally all other devices, including COM and PRN devices). PIPE, MAILSLOT, and MUP are other standard Windows devices.

Dev (film)

Dev (Hindi: देव) is a 2004 Hindi drama film, directed by Govind Nihalani. The film won the Filmfare Critics Award for Best Movie, and Kareena Kapoor won the Filmfare Critics Award for Best Actress for her performance.

Plot

Joint Commissioner of Police Dev Pratap Singh, a duty-bound, self-righteous officer, and Special Commissioner Tejinder Khosla, the balancing force between the political interests of Chief Minister Bhandarker and Dev's commitment to the law, are lifelong friends, each with his own ideals. Farhaan, a law graduate, was brought up with ideals of non-violence and patriotism. Dev unwittingly gives Farhaan the wound that plunges him into rage and violence after witnessing the death of his father during a peace demonstration. Taking advantage of the situation, corrupt politician Latif sets the vulnerable young man on a path of violence and destruction that threatens to ignite the city. Aaliya is the light in Farhaan's life. Beautiful and innocent, the young woman also gets caught in extraordinary circumstances that transform her life and she dares to stand up for the truth. Dev is the saga of Dev and Tej's friendship, a bond stronger than blood ties in which Farhaan emerges as the wedge driving them apart. The story unfolds against the vitiated atmosphere of present times where innocent lives become fodder for political expediency. The spark of terrorist violence unknowingly set off by Farhaan under the aegis of the corrupt politician Latif engulfs the whole city in its flames. Tej transgresses beyond the boundaries of law in his passion to eliminate anti-national crime. Dev is faced with the spectre of the tragic human cost and a moral compulsion to act. The stakes rise beyond self-interest. Dev and Tej are set on a path of dramatic collision. Even as Dev and Farhaan's fate gets irreversibly linked, two soldiers whose allegiance may be to different causes but admiration for each other's courage and integrity brings them together.