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