#!/usr/bin/perl -w
$^I = ".bak";
while (<>) {
s/Jasmine/JASMINE/;
print;
}
# ls
temp1.txt temp2.txt.bak temp4.txt temp5.txt.bak
temp1.txt.bak temp3.txt temp4.txt.bak temp6.txt
mmodify.pl temp2.txt temp3.txt.bak temp5.txt temp6.txt.bak
# cat temp2.txt
JASMINE is a girl
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