| The Single UNIX Specification, Version 4, $(ver_cut 3) Edition |
| https://www2.opengroup.org/ogsys/catalog/T101 |
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| single-unix-specification-4_p2018 | sus4-copyright |
| download~alpha amd64 arm ~arm64 hppa ~ia64 ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~x64-macos | gentoo |
| single-unix-specification-4_p3-r1 | sus4-copyright |
| download~alpha ~amd64 ~arm ~hppa ~ia64 ~mips ~ppc ~ppc64 ~s390 ~sparc ~x86 ~x64-macos | lanodanOverlay |
| single-unix-specification-4_p2 | sus4-copyright |
| download~alpha amd64 arm hppa ~ia64 ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~x64-macos | gentoo |