copy "cp" command how distinquish upper/lower case

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LEARN ABOUT SUNOS

toupper

toupper(3C)						   Standard C Library Functions 					       toupper(3C)

NAME

       toupper - transliterate lower-case characters to upper-case

SYNOPSIS

       #include <ctype.h>

       int toupper(int c);

DESCRIPTION

       The  toupper()  function  has  as  a domain a type int, the value of which is representable as an unsigned char or the value of EOF. If the
       argument has any other value, the argument is returned unchanged. If the argument of toupper() represents a lower-case  letter,	and  there
       exists  a  corresponding upper-case letter (as defined by character type information in the program locale category LC_CTYPE),	the result
       is the corresponding upper-case letter. All other arguments in the domain are returned unchanged.

RETURN VALUES

       On successful completion, toupper() returns the upper-case letter corresponding to the argument passed.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       _toupper(3C), setlocale(3C), attributes(5), standards(5)

SunOS 5.10							    14 Aug 2002 						       toupper(3C)

UNIX for Dummies Questions & Answers