#!/bin/bash
hcd1="hash("           # string to be added
hcd2=")as "            #string to be added
dmk=id,cust
IFS=" ,"
i=0
for val in ${dmk}
do
  i=$((++i))
  eval var${i}="${val}"
done
for ((j=1;j<=i;++j))
do
  name="var${j}"
  colname="col${j}"
  echo ${colname} = "$hcd1${!name}$hcd2 ${!name}"
done
echo "$colname1    $colname2 "