Re: Command Languages Versus Programming Languages

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;