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A comment on Unix Shell Programming: The Next 50 Years [pdf]. Parent comment

Re:Unix Shell Programming: The Next 50 Years [pdf] by gnubison on Saturday June 05, 2021 @11:45PM (#27410611)
Those work in any POSIX shell, and also zsh.
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Re:Unix Shell Programming: The Next 50 Years [pdf] by teddyh on Monday June 07, 2021 @07:54AM (#27421473)
It seems you are correct:

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...

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