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I'd rather edit with sed:
sed '
s/\.cfg$/'"$1"'/
t
s/$/'"$1"'/
' /usr/text

However, you can ksh-substring your variables like line: ${line#*.} is everything after the first dot,...

X=${1:-1.0.0}
while IFS=. read NAME EXT; do
echo $NAME$X.$EXT
done < file

:D

I don't always create as much test data as I should!


$ awk '$0 ~ S || C { C++ } C-1 > A { C = 0 } C' S="some_regex" A=2 file1