bash - Incremental number in shell script on each loop -

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#!/bin/bash  echo script: $0 echo "enter customer order ref (e.g. 100018)" read p_cust_order_ref echo "enter du id (e.g. 100018)" read p_du_id  p_order_id=${p_cust_order_ref}${p_du_id}   #loop through xml files in current directory f in *.xml   #increment p_cust_order_ref here done

inside loop how can increment p_cust_order_ref 1 every time loops

so reads 10000028 uses on first loop 2nd 10000029 3rd 10000030 4th 10000031 

((p_cust_order_ref+=1))

or

let p_cust_order_ref+=1

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