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Re: why would "tr --complement --squeeze-repeats ..." append the substitution char once more? ...

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On Mon, Dec 11, 2023 at 11:25:13AM +0000, Albretch Mueller wrote:
>  "tr --complement --squeeze-repeats ..." makes sure that the replaced
> characters only appear once (that it doesn't immediately repeat). Say
> you have something like "  " (two spaces) or "?$|" (three characters)
> which will be replaced by just an underscore.

...which would change the length, as I wrote.

> In the case of: "ASCII text"
>  what should come out of it is: "ASCII_text"
>  not: "ASCII_text_"
>  no underscore at the end. That is the question I have.

That depends on whether your "ASCII text" has some thingy at the end
which you don't see. A newline, perchance?

>  I use such constructs as: "[A-Za-z0-9.]" to make explicit to myself
> and other people what I mean. I work in corpora research dealing with
> text based various alphabets not just in ASCII so I avoid any kinds of
> linguistic/cultural shortcuts and abbreviations.

What has this to do with how tr works? It will treat [ and ] as characters
not to substitute. I pointed that out, because it might have been unintended:

  echo -n 'This is a  text with [some brackets] in   it' | tr -cs "[A-Za-z0-9.]" "_"
  This_is_a_text_with_[some_brackets]_in_it

(Note this "-n" on the echo, btw? Without it, I'd be getting a "_" at the
end, the transliterated newline).

Do whatever you want :-)

Cheers
-- 
t

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why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-11 04:00 +0100
  Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Greg Wooledge <greg@wooledge.org> - 2023-12-11 04:40 +0100
    Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-11 09:10 +0100
      Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... <tomas@tuxteam.de> - 2023-12-11 09:40 +0100
        Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-11 12:30 +0100
          Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... tomas@tuxteam.de - 2023-12-11 13:00 +0100
          Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Greg Wooledge <greg@wooledge.org> - 2023-12-11 13:40 +0100
        Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Greg Wooledge <greg@wooledge.org> - 2023-12-11 13:50 +0100
          Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... <tomas@tuxteam.de> - 2023-12-11 14:20 +0100
            Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Greg Wooledge <greg@wooledge.org> - 2023-12-11 14:30 +0100
              Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-11 15:10 +0100
                Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Max Nikulin <manikulin@gmail.com> - 2023-12-11 16:00 +0100
                Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Greg Wooledge <greg@wooledge.org> - 2023-12-11 16:00 +0100
                Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... <tomas@tuxteam.de> - 2023-12-11 16:10 +0100
                "echo" literally in sh scripts (was: why would "tr --complement --squeeze-repeats ..." append the substitution char once more? ...) Stefan Monnier <monnier@iro.umontreal.ca> - 2023-12-11 16:20 +0100
                Re: "echo" literally in sh scripts (was: why would "tr --complement  --squeeze-repeats ..." append the substitution char once more? ...) Greg Wooledge <greg@wooledge.org> - 2023-12-11 18:00 +0100
                Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-11 20:00 +0100
  Re: why would "tr --complement --squeeze-repeats ..." append the  substitution char once more? ... debian-user@howorth.org.uk - 2023-12-11 19:20 +0100

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