N'afọ 1990, ndị òtù GNU malitere iji Carnegie Mellon's Mach microkernel na oru ngo a na-akpọ GNU Hurd, nke na-enwetabeghị ọkwa ntozu oke achọrọ maka nnabata POSIX zuru oke. Ajụjụ: Gịnị bụ Emacs?
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