We have already describes few Linux or Unix shell scripts with if or while commands, if you want to increment a value or use in loops . The variable nae is "no",

no=$((no+1))

or
((no+=1))

or

or you can use let:
let "no=no+1"

or
let "var+=1"


For example :



no=1;

for ((n=0;n<10;n++))

do

echo "$no"

no=$((no+1))

done