07-26-2012
Quote:
Originally Posted by
FUTURE_EINSTEIN
I need to create 1 line pipe that outputs list of files whose second character is digit in reverse order (file is a directory and called /tmp)the way I did
ls /tmp | grep '^.[[:digit:]]*' | sort -r
That pattern is incorrect. If the second character is any non-digit (or even if there is no second character at all), the pattern will match.
* allows zero digits to match.
Regards,
Alister
This User Gave Thanks to alister For This Post:
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LEARN ABOUT REDHAT
iswdigit
ISWDIGIT(3) Linux Programmer's Manual ISWDIGIT(3)
NAME
iswdigit - test for decimal digit wide character
SYNOPSIS
#include <wctype.h>
int iswdigit(wint_t wc);
DESCRIPTION
The iswdigit function is the wide-character equivalent of the isdigit function. It tests whether wc is a wide character belonging to the
wide character class "digit".
The wide character class "digit" is a subclass of the wide character class "xdigit", and therefore also a subclass of the wide character
class "alnum", of the wide character class "graph" and of the wide character class "print".
Being a subclass of the wide character class "print", the wide character class "digit" is disjoint from the wide character class "cntrl".
Being a subclass of the wide character class "graph", the wide character class "digit" is disjoint from the wide character class "space"
and its subclass "blank".
Being a subclass of the wide character class "alnum", the wide character class "digit" is disjoint from the wide character class "punct".
The wide character class "digit" is disjoint from the wide character class "alpha" and therefore also disjoint from its subclasses "lower",
"upper".
The wide character class "digit" always contains exactly the digits '0' to '9'.
RETURN VALUE
The iswdigit function returns non-zero if wc is a wide character belonging to the wide character class "digit". Otherwise it returns zero.
CONFORMING TO
ISO/ANSI C, UNIX98
SEE ALSO
isdigit(3), iswctype(3)
NOTES
The behaviour of iswdigit depends on the LC_CTYPE category of the current locale.
GNU
1999-07-25 ISWDIGIT(3)