Shell Programming and Scripting

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num=3
number=1
until [ "$num" == "12" ]
do
sed 's/^'$num'$/'$number'/'
#num=$(( num + 1 ));    # this work also
#nummer=$(( nummer + 1 ));  # this work also
num=$( expr $num + 1 )
number=$( expr $number + 1 )
done < file.txt > file2.txt
echo "$num"
echo "$number"
exit 0

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awk '$1 <= 12 { $1=$1-2 }1' inputfile > outputfile