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In what year was the Linux kernel first released?

Answer

1,991

1991 uint256

unit
calendar year, as a decimal integer (Gregorian year, no epoch offset)
linux_kernel
the kernel, not a distribution built on it
first_released
the year the first public release of the Linux kernel was made available: version 0.01 was written and uploaded in September 1991 and version 0.02 was announced by Linus Torvalds on 5 October 1991; both fall in 1991
sources
en.wikipedia.org, cdn.kernel.org, kernel.googlesource.com, kernel.org, linus torvalds' usenet announcement in comp.os.minix, 25 august 1991, and the linux kernel archives history (kernel.org), both dating the first public release of linux to 1991, linus torvalds' usenet announcement of linux 0.01 on comp.os.minix, dated september 1991; corroborated by kernel.org history and wikipedia's linux kernel article, linus torvalds' usenet announcement of linux on comp.os.minix, dated august 25, 1991; kernel.org history, linus torvalds' usenet announcement of linux, comp.os.minix, august 25, 1991, linus torvalds' usenet announcement of linux, posted to comp.os.minix on 1991-08-25, and the linux kernel archives history page (kernel.org), both stating the first public release (v0.01) occurred in 1991., linus torvalds' usenet announcement on comp.os.minix, 25 august 1991, and the linux kernel archives (kernel.org) listing the 0.01 source release dated 17 september 1991, linus torvalds's august 25, 1991 comp.os.minix usenet post announcing the project, and the linux kernel archives (kernel.org) history, which date the first public kernel release (v0.01) to september 1991, linus torvalds's august 25, 1991 usenet announcement on comp.os.minix, and wikipedia's 'history of linux' article, both dating the first release to 1991, linus torvalds's original comp.os.minix usenet announcement (25 august 1991) and the linux kernel archives history (kernel.org), both stating the kernel was first released in 1991, linus torvalds, ‘30 years since the linux 0.01 release,’ linux-kernel archive, september 17, 2021: https://lkml.iu.edu/hypermail/linux/kernel/2109.2/03485.html, linux foundation, 'anniversary of first linux kernel release': https://www.linuxfoundation.org/blog/blog/anniversary-of-first-linux-kernel-release-a-look-at-collaborative-value (states that the first kernel was released on october 5, 1991)., linux foundation, kernel archeology / 2020 kernel history report, introduction: https://project.linuxfoundation.org/hubfs/reports/2020_kernel_history_report_082720.pdf, linux kernel archives (kernel.org) history and linus torvalds' 1991 usenet announcement of linux 0.01, linux kernel archives history (kernel.org) and linus torvalds' original usenet announcement of the linux kernel, dated 1991, linux kernel documentation, introduction (https://cdn.kernel.org/doc/html/latest/process/1.intro.html); linux foundation, 2020 kernel history report (https://project.linuxfoundation.org/hubfs/reports/2020_kernel_history_report_082720.pdf)., linux kernel documentation, introduction (https://cdn.kernel.org/doc/html/latest/process/1.intro.html); linux foundation, anniversary of first linux kernel release (https://www.linuxfoundation.org/blog/blog/anniversary-of-first-linux-kernel-release-a-look-at-collaborative-value), lkml.iu.edu, origin.kernel.org, project.linuxfoundation.org, wikipedia, 'history of linux' / 'linux kernel': linus torvalds first publicly released the linux kernel, version 0.01, in september 1991, www.kernel.org, www.linuxfoundation.org

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