ɪn kəmpjˈuːɾɪŋ,  ɪz ɐ kəmˈænd fˈaʊnd ˌɔn mˈoʊst jˈuːnɪkslˈaɪk ˈɑːpɚɹˌeɪɾɪŋ sˈɪstəmz, ˈɪntɛl ˈaɪ ˌɑːɹɹˌɛmˈɛks ˈeɪɾi sˈɪks, ˈɛvɹi mˈaɪkɹəsˌɑːft wˈɪndoʊz ˈɑːpɚɹˌeɪɾɪŋ sˈɪstəm sˈɪns wˈɪndoʊz sˈɜːvɚ tˈuː θˈaʊzənd θɹˈiː, ænd ˌɔn ɹɪˈækt ˌoʊˈɛs.
In computing,  is a command found on most Unix-like operating systems, Intel iRMX 86, every Microsoft Windows operating system since Windows Server 2003, and on ReactOS.