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Full Discussion: Change a character based on its position number
Top Forums UNIX for Dummies Questions & Answers Change a character based on its position number Post 302712819 by Don Cragun on Tuesday 9th of October 2012 09:24:19 PM
Old 10-09-2012
Which letter do you want to change?
Which letter do you want to replace it?
Which occurrence of that latter do you want to change?

You said my script doesn't work properly. What does that mean? Did it produce a diagnostic message? Was some other character in the file changed? What system are you using?

When I try to change the 150th occurrence of T to C in the file you attached using the script I provided, the T in column 20 of line 13 does change from T to C just as you said you wanted.

Looking more closely at your input file I see that there are 4998 As, 5095 Cs, 2108 Gs, 3997 Ts, and 332 newlines in a file that contains 17,235 bytes. Could the problem be that there are four sequences of lowercase letters in the big file you attached, but only uppercase letters in the sample that you said was representative of your entire file?
Last edited by Don Cragun; 10-09-2012 at 10:58 PM.. Reason: The sample data was not representative of the actual data???
 

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LEARN ABOUT SUSE

tolower

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

NAME

       toupper, tolower - convert letter to upper or lower case

SYNOPSIS

       #include <ctype.h>

       int toupper(int c);
       int tolower(int c);

DESCRIPTION

       toupper() converts the letter c to upper case, if possible.

       tolower() converts the letter c to lower case, if possible.

       If c is not an unsigned char value, or EOF, the behavior of these functions is undefined.

RETURN VALUE

       The value returned is that of the converted letter, or c if the conversion was not possible.

CONFORMING TO

       C89, C99, 4.3BSD.

BUGS

       The  details  of  what constitutes an uppercase or lowercase letter depend on the current locale.  For example, the default "C" locale does
       not know about umlauts, so no conversion is done for them.

       In some non-English locales, there are lowercase letters with no corresponding uppercase equivalent; the German sharp s is one example.

SEE ALSO

       isalpha(3), setlocale(3), towlower(3), towupper(3), locale(7)

COLOPHON

       This page is part of release 3.25 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
								    1993-04-04								TOUPPER(3)
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