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Top Forums Shell Programming and Scripting Replace specific letter in a file by other letter Post 302943811 by RudiC on Wednesday 13th of May 2015 04:51:21 AM
Old 05-13-2015
That's how it works. Redirect the output to a temp file and then, mv the temp file to data.txt, overwriting it.
 

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TOWLOWER(3)						   BSD Library Functions Manual 					       TOWLOWER(3)

NAME
towlower, towlower_l -- upper case to lower case letter conversion (wide character version) LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wctype.h> wint_t towlower(wint_t wc); #include <wctype.h> #include <xlocale.h> wint_t towlower_l(wint_t wc, locale_t loc); DESCRIPTION
The towlower() function converts an upper-case letter to the corresponding lower-case letter. Although the towlower() function uses the current locale, the towlower_l() function may be passed a locale directly. See xlocale(3) for more information. RETURN VALUES
If the argument is an upper-case letter, the towlower() function returns the corresponding lower-case letter if there is one; otherwise, the argument is returned unchanged. SEE ALSO
iswlower(3), tolower(3), towupper(3), wctrans(3), xlocale(3) STANDARDS
The towlower() function conforms to ISO/IEC 9899:1999 (``ISO C99''). BSD
October 3, 2002 BSD
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