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Sun, 02 Jul 2023 00:29:42 -0700 (PDT) MIME-Version: 1.0 References: <25FF68CF-F93D-4745-84D1-A97A5ECCA348@gmail.com> In-Reply-To: From: Roman Perepelitsa Date: Sun, 2 Jul 2023 09:29:29 +0200 Message-ID: Subject: Re: Bug/regression: tt(RANDOM) seed not updating when $RANDOM is used in a pipe To: Mikael Magnusson Cc: Jon Oster , zsh-users@zsh.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Seq: 29102 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 Sun, Jul 2, 2023 at 9:19=E2=80=AFAM Mikael Magnusson = wrote: > > On 6/28/23, Jon Oster wrote: > > In 5.8.1, $RANDOM seems not to update its state when the command $RANDO= M > > was used in is piped somewhere. For example: > > > > # echo $RANDOM > > 18163 > > # echo $RANDOM > > 23472 > > # echo $RANDOM > > 27685 > > # echo $RANDOM|cat > > 10178 > > # echo $RANDOM|cat > > 10178 > > # echo $RANDOM > > 10178 > > # echo $RANDOM > > 17862 > > A simple workaround for this, whether you consider it a bug or a feature, > % () { echo $1 | cat } $RANDOM > 21589 > % () { echo $1 | cat } $RANDOM > 301 > > or > % echo $RANDOM > >(cat) > 1324 > % echo $RANDOM > >(cat) > 9460 An alternative workaround is to use a random number generator whose state is kept outside of the current process. Here's an example: https://gist.github.com/romkatv/a6cede40714ec77d4da73605c5ddb36a. An added advantage of this approach is that you get a 32-bit number rather than the 15-bit provided by $RANDOM. Roman.