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Full Discussion: How to validate an IP address
Top Forums Shell Programming and Scripting How to validate an IP address Post 63122 by zazzybob on Tuesday 22nd of February 2005 08:43:51 PM
Old 02-22-2005
Give this a try
Code:
#!/bin/sh

echo "Enter IP address"
read quad

oldIFS=$IFS
IFS=.
set -- $quad

if [ "$#" -ne "4" ]; then
  echo "Must have 4 parts"
  exit 1
fi

for oct in $1 $2 $3 $4; do
  echo $oct | egrep "^[0-9]+$" >/dev/null 2>&1
  if [ "$?" -ne "0" ]; then
     echo "$oct: Not numeric"
     exit 1
  else
     if [ "$oct" -lt "0" -o "$oct" -gt "255" ]; then
        echo "$oct: Out of range"
        exit 1
     fi
  fi
done

# if we're here, we're validated
echo "$quad validates OK!"
exit 0

Cheers
ZB
 

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LEARN ABOUT DEBIAN

wakeonlan

WAKEONLAN(1)						User Contributed Perl Documentation					      WAKEONLAN(1)

NAME

       wakeonlan - Perl script to wake up computers

SYNOPSIS

       wakeonlan [-h] [-v] [-i IP_address] [-p port] [-f file] [[hardware_address] ...]

DESCRIPTION

       This script sends 'magic packets' to wake-on-lan enabled ethernet adapters and motherboards, in order to switch on the called PC. Be sure
       to connect the NIC with the motherboard if neccesary, and enable the WOL function in the BIOS.

       The 'magic packet' consists of 6 times 0xFF followed by 16 times the hardware address of the NIC. This sequence can be encapsulated in any
       kind of packet. This script uses UDP packets.

OPTIONS

       -h  Displays the help information.

       -v  Displays the script version.

       -i ip_address
	   Destination IP address. Unless you have static ARP tables you should use some kind of broadcast address (the broadcast address of the
	   network where the computer resides or the limited broadcast address). Default: 255.255.255.255 (the limited broadcast address).

       -p port
	   Destination port. Default: 9 (the discard port).

       -f file
	   File with hardware addresses of wakeable computers. For an example check the file lab001.wol in the examples subdirectory.

EXAMPLES

       Using the limited broadcast address (255.255.255.255):

	   $ wakeonlan 01:02:03:04:05:06
	   $ wakeonlan 01:02:03:04:05:06 01:02:03:04:05:07

       Using a subnet broadcast address:

	   $ wakeonlan -i 192.168.1.255 01:02:03:04:05:06

       Using another destination port:

	   $ wakeonlan -i 192.168.1.255 -p 1234 01:02:03:04:05:06

       Using a file as source of hardware and IP addresses:

	   $ wakeonlan -f examples/lab001.wol
	   $ wakeonlan -f examples/lab001.wol 01:02:03:04:05:06

AUTHOR

       Jose Pedro Oliveira <jpo@di.uminho.pt> maintaining and expanding original work done by Ico Doornekamp <ico@edd.dhs.org>.

COPYRIGHT

       Copyright (c) 2000-2005 Jose Pedro Oliveira.

       This is free software.  You may modify it and distribute it under Perl's Artistic Licence.  Modified versions must be clearly indicated.

SEE ALSO

       For more information regarding this script and Wakeonlan technology just check the following address
       http://gsd.di.uminho.pt/jpo/software/wakeonlan/.

perl v5.14.2							    2012-03-10							      WAKEONLAN(1)
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