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Null device
In some operating systems, the null device is a device file that discards all data written to it but reports that the write operation succeeded. This device is called /dev/null on Unix or Unix-like systems, NUL: or NUL on DOS and CP/M, \Device\Null on Windows NT, nul on newer Windows systems, NIL: on Amiga operating systems, and the NL: on OpenVMS. In Windows Powershell, the equivalent is $null. It provides no data to any process that reads from it, yielding EOF immediately. In IBM DOS, MFT, MVT, OS/390 and z/OS operating systems, such files would be assigned in JCL to DD DUMMY.
In programmer jargon, especially Unix jargon, it may also be called the bit bucket〔(【引用サイトリンク】url=http://catb.org/esr/jargon/html/B/bit-bucket.html )〕 or black hole.
==Usage==
The null device is typically used for disposing of unwanted output streams of a process, or as a convenient empty file for input streams. This is usually done by redirection.
The /dev/null device is a special file, not a directory, so one cannot move a whole file or directory into it with the Unix mv command. The rm command is the proper way to delete files in Unix.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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