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use this commandyou can assign a variable var1=123456789
var1=123456789
sed -i 's/[3-8]/*/g' file
[3-8]echo $var1 for all char from 3-8 andwill give g123456789
[3-8]echo $var1
g123456789
then var2="${var1:0:2}*****${var1:8:9}"
var2="${var1:0:2}*****${var1:8:9}"
echo $var2 will replace every instancegive 12*****9
echo $var2
12*****9
use this command
[3-8] for all char from 3-8 and g will replace every instance
[3-8]
g
you can assign a variable var1=123456789
echo $var1 will give 123456789
echo $var1
123456789
echo $var2 will give 12*****9
