DISCLAIMER
This script is as is. I give no warranty it will work as you expected on your system. You are running it at your own risk. If something goes wrong because of this script, I bear no responsibility.
Language
server# bash -version
GNU bash, version 3.2.52(1)-release (sparc-sun-solaris2.10)
Copyright (C) 2007 Free Software Foundation, Inc.
Purpose
You know a hexadecimal id, and want to find out what is the device id at X positions AFTER. Analogy in decimal world would be – Decimal number at 200 positions AFTER 11 is 211.
Usage
server# lastdev.bash 1A1 4
1A4
server# cat lastdev.bash
#!/bin/bash
# A script to display nth hex number from given hex number
# If you have to assign 8 devices, starting number is A1
# ./lastdev.bash A1 8 (will show A8) - It includes given number in calculation
# Read the given arguments and assign to appropriate variables
firsthex=`echo $1 | tr "[:lower:]" "[:upper:]" `
lastval=$2
# Check whether the lastval is numeric
if [[ ! -z $lastval ]] ; then
lastval_check=`echo $lastval| tr -d "[0-9]"`
if [[ ! -z $lastval_check ]]; then
echo "ERROR - Numeric value $lastval is not an integer"
exit
fi
else
echo "ERROR - Device count not given"
echo "lastdev.bash <hex-devid> <dev_count>"
exit
fi
# Set up h2d function which will convert hex to dec and vice versa
function h2d {
echo "ibase=16; $@"|bc
}
function d2h {
echo "obase=16; $@"|bc
}
# Convert first number into dec
firstdec=`h2d $firsthex`
let lastdec="$firstdec + $lastval - 1"
lasthex=`d2h $lastdec`
echo $lasthex
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