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How to replace comma by slash using sed in an UTF8 file

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# 1  
Old 11-18-2009
How to replace comma by slash using sed in an UTF8 file
Hello all,

I'd like to replace "," by "/" in a utf8 file from postion X to Y. Comma "," is also defined as delimiter.

12345678901234567890,123456789012345,12345678901234567890,
aaaa,aaaa,aaaaa ,bbb,bbbb,bbbbb ,cccccc,cc ,

Result should be
12345678901234567890,123456789012345,12345678901234567890,
aaaa/aaaa/aaaaa ,bbb/bbbb/bbbbb ,cccccc/cc ,

Example:
replace "," by "/" from postion 1 to 20
skip "," in the postion 21
replace "," by "/" from postion 22 to 35
skip "," in the postion 36
replace "," by "/" from postion 37 to 56
skip "," in the postion 57

Thank you for your support
# 2  
Old 11-21-2009
How about substrings?

Code:
OUT=$( echo "${IN:$(($X-1)):$(($Y-$X))}" | sed 's/,/\//' )

(Reference)
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