IP to HEX convertor
===================

Public domain
********************************************************************************
    
    #!/bin/bash
    
    ##################################################
    # Function : ip to hex convertor
    ##################################################
    ip2hex() {
      N4=$(echo $IP | sed -e "s,.*\.,,")
      N3=$(echo $IP | sed -e "s,\.${N4}$,," -e "s,.*\.,,")
      N2=$(echo $IP | sed -e "s,\.${N3}\.${N4}$,," -e "s,.*\.,,")
      N1=$(echo $IP | sed -e "s,\.${N2}\.${N3}\.${N4}$,," -e "s,.*\.,,")
      PREFIX=""
      BINARY=""
      MASK=""
      echo $N4 | grep -q "/"
      if [ "$?" == "0" ]; then
        PREFIX=$(echo $N4 | sed -e 's,.*/,,')
        N4=$(echo $N4 | sed -e "s,/$PREFIX,,")
        ZERO=$(( 32 - $PREFIX ))
        for I in $(seq 1 $PREFIX); do
          BINARY="${BINARY}1"
        done
        for I in $(seq 1 $ZERO); do
          BINARY="${BINARY}0"
        done
        MASK=$(echo "obase=16; ibase=2; $BINARY" | bc | tr '[:upper:]' '[:lower:]')
      fi
      HEXIP=$(printf "%02x%02x%02x%02x" ${N1} ${N2} ${N3} ${N4})
      if [ "${MASK}" != "" ]; then
        HEXIP="$HEXIP/$MASK"
      fi
      echo Debug : ${IP} ${N1} ${N2} ${N3} ${N4}
      echo Debug : PREFIX=$PREFIX BINARY=$BINARY MASK=$MASK
    }
    
    ##################################################
    # Single IP 
    ##################################################
    
    IP=192.168.1.1
    ip2hex
    echo $HEXIP
    
    ##################################################
    # Subnet
    ##################################################
    
    echo
    IP=10.20.30.10/28
    ip2hex
    echo $HEXIP
    
    # Pejman Moghadam
    # Sat Dec 25 09:42:42 IRST 2010

    
********************************************************************************
_BY: Pejman Moghadam_  
_TAG: sed, bc, bash-script, bash_  
_DATE: 2010-12-25 09:42:42_