cc: [email protected]
Subject: Re: RE: [ast-users] How do I have : in an egrep [...] range?
--------
> > > Is there a simple *builtin* way for the other way round, get the character
> > > from its ordinal number? I seem to recall there was, but don't remember.
> >
> > typeset -i8 c=95
> > printf "\\${c#*#}\n"
>
> Thanks. But I fear this needs some explanation; e.g. why does changing the
> base
> from 8 to 12 (or 10 or 2) make that fail (and even fail in different ways)?
> Why need hte base definition at all? And what's the semantics of the '\\' in
> this context; printf --man seems to not explain that? Mind to elaborate?
>
> (Also still interested in the question why plain printf "%c" doesn't work for
> that purpose.)
>
> Thanks again.
>
%c doesn't work because the POSIX standard states that the the c conversion
must treat the operand as a string, and not convert it to a numerical constant.
Thus
printf "%c\n" 93
must output 9.
ANSI C strings understand octal constants, hex constants, \x..., and
unicode constants, \u. Since the number of digits is variable \u[...]
can determine the end of the unicode character.
David Korn
[email protected]
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