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Full Discussion: Grep exact IP address from file
Top Forums UNIX for Dummies Questions & Answers Grep exact IP address from file Post 302766431 by Corona688 on Monday 4th of February 2013 04:54:31 PM
Old 02-04-2013
I'd do that by telling grep the previous and next characters must either be beginning of line, end of line, or non-numeric.

Once you've done that you can grep entire lists of things with -f.

Code:
while read IP
do
        IP="${IP//./\\.}" # Turn . into \., since . is special to awk
        echo "(^|[^0-9])${IP}($|[^0-9])"
done < address.list > address.regex

egrep -f address.regex configfile

This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT REDHAT

iwspy

IWSPY(8)						     Linux Programmer's Manual							  IWSPY(8)

NAME

       iwspy - Get wireless statistics from specific nodes

SYNOPSIS

       iwspy interface
       iwspy interface [+] DNSNAME | IPADDR | HWADDR [...]
       iwspy interface off

DESCRIPTION

       Iwspy  is  used	to set a list of addresses in a wireless network interface and to read back quality of link information for each of those.
       This information is the same as the one available in /proc/net/wireless : quality of the link, signal strength and noise level.

       This information is updated each time a new packet is received, so each address of the list add some overhead in the driver.

       Note the this functionality work only for node part of the current wireless cells.

PARAMETERS

       You may set any number of addresses up to 8.

       DNSNAME | IPADDR
	      Set an IP address, or in some cases a DNS name (using the name resolver). As the hardware work with hardware addresses,  iwspy  will
	      translate this IP address through ARP.  In some case, this address might not be in the ARP cache and iwspy will fail. In those case,
	      ping(8) this name/address and retry.

       HWADDR Set a hardware (MAC) address (this address is not translated & checked like the IP one). The address must contain a colon (:) to	be
	      recognised as a hardware address.

       +      Add  the new set of addresses at the end of the current list instead of replacing it. The address list is unique for each device, so
	      each user should use this option to avoid conflicts.

       off    Remove the current list of addresses and disable the spy functionality

FILES

       /proc/net/wireless

SEE ALSO

       iwconfig(8), ifconfig(8), iwlist(8).  iwpriv(8).

net-tools							  31 October 1996							  IWSPY(8)
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