#!/bin/bash    

a=2334           
let b=a+3  # isxyei kai to b=$a+3
let "c = a+3"
let "d = a+ 3"

z=$(($a+13))
y=$((a+23))  # Epishs swsto

k=`expr $a + 33` # Xrhsh entolhs expr

echo $a $b $c $d $k $z $y
#2334 2337 2337 2337 2367 2347 2357
