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From: Rainer Weikusat <rweikusat@talktalk.net>
Newsgroups: comp.unix.shell,comp.unix.programmer,comp.lang.misc
Subject: Re: Command Languages Versus Programming Languages
Date: Fri, 22 Nov 2024 15:52:41 +0000
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Rainer Weikusat <rweikusat@talktalk.net> writes:

[...]


> Something which would match [0-9]+ in its first argument (if any) would
> be:
>
> #include "string.h"
> #include "stdlib.h"
>
> int main(int argc, char **argv)
> {
>     char *p;
>     unsigned c;
>
>     p = argv[1];
>     if (!p) exit(1);
>     while (c = *p, c && c - '0' > 10) ++p;

This needs to be

while (c = *p, c && c - '0' > 9) ++p