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Top Forums Shell Programming and Scripting Insert space between characters using sed Post 302447242 by konsolebox on Sunday 22nd of August 2010 12:20:31 AM
Old 08-22-2010
To prevent space from being added at the end:
Code:
#!/usr/bin/env gawk

{
	do {
		a = $0
		$0 = gensub(/([^[:blank:]]{3})([^[:blank:]])/, "\\1 \\2", "", a)
	} while (a != $0)

	print
}

... | gawk --re-interval -f script.awk

Or one-liner:
Code:
... | gawk --re-interval '{ do { a = $0; $0 = gensub(/([^[:blank:]]{3})([^[:blank:]])/, "\\1 \\2", "", a); } while (a != $0); } 1'

It's still consistent even if blank characters exist along or at the end of the string.

Last edited by konsolebox; 08-22-2010 at 02:10 AM..
 

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ISWBLANK(3)						     Linux Programmer's Manual						       ISWBLANK(3)

NAME
iswblank - test for whitespace wide character SYNOPSIS
#include <wctype.h> int iswblank(wint_t wc); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): iswblank(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION
The iswblank() function is the wide-character equivalent of the isblank(3) function. It tests whether wc is a wide character belonging to the wide-character class "blank". The wide-character class "blank" is a subclass of the wide-character class "space". Being a subclass of the wide-character class "space", the wide-character class "blank" is disjoint from the wide-character class "graph" and therefore also disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit", "xdigit", "punct". The wide-character class "blank" always contains at least the space character and the control character ' '. RETURN VALUE
The iswblank() function returns nonzero if wc is a wide character belonging to the wide-character class "blank". Otherwise it returns zero. CONFORMING TO
POSIX.1-2001. NOTES
The behavior of iswblank() depends on the LC_CTYPE category of the current locale. SEE ALSO
isblank(3), iswctype(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2010-09-20 ISWBLANK(3)
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