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

From	<tomas@tuxteam.de>
Newsgroups	linux.debian.user
Subject	Re: why would "tr --complement --squeeze-repeats ..." append the substitution char once more? ...
Date	2023-12-11 14:20 +0100
Message-ID	<HJOmt-cQqs-1@gated-at.bofh.it> (permalink)
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On Mon, Dec 11, 2023 at 07:42:10AM -0500, Greg Wooledge wrote:
> On Mon, Dec 11, 2023 at 09:37:42AM +0100, tomas@tuxteam.de wrote:
> >  2. This is tr, not regexp, so '[A-Za-z0-9.]' isn't doing what you
> >    think it does. It will match '[', 'A' to 'Z', 'a' to 'z','.' and
> >    ']'. I guess you want to say 'A-Za-z0-9.'
> 
> Well spotted.
> 
> >  3. As a convenience, tr has char classes. Perhaps [:alnum:] is for
> >    you. No idea whether this is a GNU extension
> 
> It's POSIX.  100% portable, as long as you ignore any bugs in GNU tr.
> 
> Looks like GNU tr in Debian 12 still doesn't handle multibyte characters
> correctly:
> 
>     unicorn:~$ echo 'mañana' | tr ñ X
>     maXXana
> 
> So... as long as you're working in the C locale, where [:alnum:] is
> just the ASCII capital and lowercase letters and digits, you should be
> fine.

Hey, you just gave us a handy way to count how many encoding units
a character takes:

  tomas@trotzki:~$ echo 'birdie🐦here' | tr -c 'a-z' X
  birdieXXXXhereX

;-)

Cheers
-- 
t

Thread

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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