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Top Forums Shell Programming and Scripting Remove characters from fixed length file Post 302637173 by birei on Tuesday 8th of May 2012 12:24:39 PM
Old 05-08-2012
Yes.

^   Beginning of line
.   Any character...
\{35\}   ...repeated 35 times
$   End of line
s/match/replacement/   Substitute command
\(...\)   Group content matched
\1   Content of group 1.

So, first check if line has exactly 35 characters, and if so, match first 21 characters of the line, saving them in group 1, and next two characters (without saving), and replace all it with content of group 1, so that command will only remove characters 22 and 23.
 

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

NAME
wcsncpy - copy a fixed-size string of wide characters SYNOPSIS
#include <wchar.h> wchar_t *wcsncpy(wchar_t *dest, const wchar_t *src, size_t n); DESCRIPTION
The wcsncpy() function is the wide-character equivalent of the strncpy(3) function. It copies at most n wide characters from the wide- character string pointed to by src, including the terminating null wide character (L''), to the array pointed to by dest. Exactly n wide characters are written at dest. If the length wcslen(src) is smaller than n, the remaining wide characters in the array pointed to by dest are filled with null wide characters. If the length wcslen(src) is greater or equal to n, the string pointed to by dest will not be termi- nated by a null wide character. The strings may not overlap. The programmer must ensure that there is room for at least n wide characters at dest. RETURN VALUE
wcsncpy() returns dest. CONFORMING TO
C99. SEE ALSO
strncpy(3) COLOPHON
This page is part of release 3.53 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
2011-09-28 WCSNCPY(3)
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