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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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wconv(3C)																 wconv(3C)

NAME
towupper(), towlower() - translate wide characters SYNOPSIS
Remarks: These functions are compliant with the XPG4 Worldwide Portability Interface wide-character conversion functions. They parallel the 8-bit character conversion functions defined in conv(3C). DESCRIPTION
and have as domain a the value of which is representable as a or the value If the argument has any other value, the behavior is undefined. If the argument of represents a lowercase letter, the result is the corresponding uppercase letter. If the argument of represents an uppercase letter, the result is the corresponding lowercase letter. All other arguments are returned unchanged. Definitions for these functions, the types and the value are provided in the header. EXTERNAL INFLUENCES
Locale The category determines the translations to be done. International Code Set Support Single-byte and multi-byte character code sets are supported. AUTHOR
was developed by IBM, OSF, and HP. SEE ALSO
conv(3C), multibyte(3C), wctype(3C), setlocale(3C), lang(5), thread_safety(5). STANDARDS CONFORMANCE
wconv(3C)
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