Linux Shell Scripting - Variable Declaration, Incrementing

Linux Shell Scripting - Variable Declaration, Incrementing,Looping

Variable Declaration - Integer

To assign an int value to a variable,

((j=1))

Variable Incrementing 

To Increment value to the variable,

 let j+=1

echo $j

Reference:

http://stackoverflow.com/questions/10999541/incremental-number-in-shell-script-on-each-loop

Looping using for loop

We can  Java syntax like (for loop) in shell script.

See the following block of script.

for ((i=1;i<10;i++))

 do

 echo $i;

 done

This syntax some what easy, when we want to iterate for longer time.

The same could be achieved by following block of script.

 for i in 1 2 3 4 5 6 7 8 9 10;

 do

 echo  $i

                                                     done
 

We cannot use this syntax,when we want to iterate  more number of times.