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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.1 Subject: Re: Bug/regression: tt(RANDOM) seed not updating when $RANDOM is used in a pipe Content-Language: en-US To: zsh-users@zsh.org References: <25FF68CF-F93D-4745-84D1-A97A5ECCA348@gmail.com> From: Eric Cook In-Reply-To: <25FF68CF-F93D-4745-84D1-A97A5ECCA348@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:GZ8lcT/hTL5VYl2q8aTp/ZeDLmc5M6cMmgD+CJQbzpWVrjfnBR8 rniomkqW5DTgWGqra4Fau1bp5HWnpkSdOPUeqII/IWO45jtZqqWo7oVGWANzEfEaHYKxTNk gHjseirYer0aSSeYOF7vOloN494AIAsRawk25wFX2hvBG9M0uojQx5jJTrUCv6uE3zT91CO 7TsDbh6df2f6lzKOczaew== UI-OutboundReport: notjunk:1;M01:P0:jCVspOlTSO4=;yLIEp2TKGVtjk/8coDNQ9mNui3G /gUI50hZIJEgjx8+Z6ez2kimPSfXqdSfWPn1FgPOis8hVu0a/ak07DwG9izRP+NemXxebkmQP 1/mt5CLyMtr2TZkXqwALTm3jfg+irpKYB7WA9JnOzVmu3F6I7w7csMSs34R36EsJstMATPmO3 raqRhkp2fmisGME4L1U9lfUU1qI8R2YBg59xSWvQXFTDgeOx6Cq6ZkfHkH6vQk14cFmBXpQJ0 JTW0B7hgUo7rpSfA05Tik3jG9HXJQYdz0vlDURa+JqGDoWXhgcAoQSRke/qHPtVx2CsElPUxl ByoTG/StN4Ar0C5xQDOy+LakG+MkpFa5XJj1KuYeOCBRznEXzasximv3vFaUMZLpWi53Q8iZ7 DZsaKXp5CT0Ca0Xy+jcQ2LhsuQSAPFngrgAYOJtrM2xj/dn8LyTnuXo9I6Tg1athVJLd1SaYQ 06suc1XPo2ny70hIxNM3NDQTJ9u45qQ9DuuSGDfBp7oFBrG+5s051upI9z8QQSuPAndFZxUDK IFi6+anD9yNDtcf1syR7/eNENwrXUEKn8rQHWESgkYwl+v0EtY1qXq4YGnq6T++BcRCzenNlz 6+iv4sElkaKj7vyoJH9dmbvjaCKPcuwcpZQXW8FRQLUj40nhxldrWyuaUTAstHt3wu5CU/UNp w2Rr3IG3DDTMcfo5hFdvp1YC/91Vpr0hrpeo39AqB2cqe+T5LqkOfg0azNwKcZrTKWt5CkESp xT4hfiW+QCkSSYaoCJCP1vU6FZ5igj2lwmDRLXAX1kJXoL9e25cGRZjrCMiJFHQxk0wzkKGRf 3Llelqu9lJ4lPFlwHu1hYa3pwy7r/TH78aQ1sspDqDl55lt3n5J6i3gYvzaWZAIkB5OqzW1/j NaFtsD6Bx+bOULtfCYz2odoQsC190Y7aX86ptLtAqSBY7AvNl8Qes9KhJBffGimHLZ60gEQji KLICYYjUh80kF6ek0wvhkZEpZAA= X-Seq: 29091 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: On 6/28/23 16:10, Jon Oster wrote: > In 5.8.1, $RANDOM seems not to update its state when the command $RANDOM > was used in is piped somewhere. For example: > > Is this considered a bug? Or is it intended behaviour? Personally, I'd > argue it's a bug. Unfortunately, my C isn't good enough to try to fix an= d > submit a patch myself, but I tried to make this bug report as helpful as > possible. > > [1] https://sourceforge.net/p/zsh/code/ci/faf0035e532cde45528806e7a05ad2= 8a0ab7c0fb/ RANDOM A pseudo-random integer from 0 to 32767, newly generated each tim= e this parame=E2=80=90 ter is referenced. The random number generator can be seeded by a= ssigning a nu=E2=80=90 meric value to RANDOM. The values of RANDOM form an intentionally-repeatable pseudo-ra= ndom sequence; subshells that reference RANDOM will result in identical pseudo-= random values unless the value of RANDOM is referenced or seeded in the paren= t shell in be=E2=80=90 tween subshell invocations. The LHS of the pipe should be a subshell, so the behavior is intentional. RANDOM has be documented to work that way since it's introduction and this= is commonly misreported as a bug.