Add a character C in a column if that column is blank


 
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# 22  
Old 08-28-2013
Perhaps you are using a somewhat older version of mawk who until very recently did not understand character classes. Try:
Code:
awk -W version


Last edited by Scrutinizer; 08-28-2013 at 02:08 PM..
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WCWIDTH(3)						   BSD Library Functions Manual 						WCWIDTH(3)

NAME
wcwidth, wcwidth_l -- number of column positions of a wide-character code LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wchar.h> int wcwidth(wchar_t wc); #include <wchar.h> #include <xlocale.h> int wcwidth_l(wchar_t wc, locale_t loc); DESCRIPTION
The wcwidth() function determines the number of column positions required to display the wide character wc. Although the wcwidth() function uses the current locale, the wcwidth_l() function may be passed a locale directly. See xlocale(3) for more information. RETURN VALUES
The wcwidth() function returns 0 if the wc argument is a null wide character (L''), -1 if wc is not printable; otherwise, it returns the number of column positions the character occupies. EXAMPLES
This code fragment reads text from standard input and breaks lines that are more than 20 column positions wide, similar to the fold(1) util- ity: wint_t ch; int column, w; column = 0; while ((ch = getwchar()) != WEOF) { w = wcwidth(ch); if (w > 0 && column + w >= 20) { putwchar(L' '); column = 0; } putwchar(ch); if (ch == L' ') column = 0; else if (w > 0) column += w; } SEE ALSO
iswprint(3), wcswidth(3), xlocale(3) STANDARDS
The wcwidth() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). BSD
August 17, 2004 BSD