Date: Thu, 25 Sep 2025 13:04:20 -0600 From: Bob Proulx <bob@proulx.com> To: questions@freebsd.org Subject: Re: [List] Re: Nice easy sed question Message-ID: <20250925130240640304783@bob.proulx.com> In-Reply-To: <861po7hao1.fsf@ltc.des.dev> References: <c1ba0b3e-2754-4bc7-af0b-b570a7693c7a@fjl.co.uk> <20250911221857100915167@bob.proulx.com> <4c223de1-6ed0-4f56-9b50-6cc1355a9790@fjl.co.uk> <ce6d67d5-83eb-44fb-a8bf-fbc0b00e77b7@qeng-ho.org> <20250912161922207688629@bob.proulx.com> <861po7hao1.fsf@ltc.des.dev>
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Dag-Erling Smørgrav wrote: > Bob Proulx writes: > > and implements this ksh-ism so strictly speaking that is not portable > > but it does work. > > Incorrect, dollar-quoted strings are part of POSIX. > > > This is what POSIX has to say about it. > > > > The '$' character is used to introduce parameter expansion, command > > substitution, or arithmetic evaluation. If an unquoted '$' is followed > > by a character that is not one of the following: > > You are looking in the wrong place. See XCU 2.2.4: > > https://pubs.opengroup.org/onlinepubs/9799919799/utilities/V3_chap02.html#tag_19_02_04 > > > The result of $'...' such as $'\n' is strictly speaking "unspecified" > > behavior by the standard. > > On the contrary, it is perfectly well-defined. Ah! I always thought that was in the extensions. I wonder if it was at one time and then it was promoted? In any case it is good to know that it can be counted upon now to always be a supported feature of a standard shell. Thanks for the correction! Bobhelp
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