AIX awk array subscript question

[jonnl0715]

I need to load a file containing IP address and hostname into an array so that I can convert IP addresses into hostnames when parsing a log file. Is it permissable to use the IP address as the array subscript?

My data file named 'hosttable' :
10.1.2.3 host1.com
20.2.3.4 host2.com
30.3.4.5 host3.com

I have been trying to use the following awk script to load the array and display it

awk ' FILENAME == "hosttable"
{
split($0,entry," &quot
hosttable[entry[$1]] = entry[$2]
next
}

{
IP = "20.2.3.4"
foundit = 0
for ( ip in hosttable )
if ( IP == ip ) {
print IP " IP address found"
print hosttable[ip]
foundit = 1
break
}
if ( foundit == 0 )
print IP " Not found"
}
' hosttable

Any help would be useful.

many thanks

 

[vgersh99]

try something like this:

echo '10.1.2.3' | nawk -f johnl.awk
echo '10.1.2.6' | nawk -f johnl.awk
echo '20.2.3.4' | nawk -f johnl.awk

#-------------------- johnl.awk
BEGIN {
hostFile="hosttable"

FLD_hostIP=1
FLD_hostNAME=2

FLD_dataIP=1

while (getline < hostFile > 0) {
# skip comments in the config file
if ( $0 ~ /^[#].*/ ) continue;
arrConf[$FLD_hostIP]=$FLD_hostNAME
}
close(hostFile);
}


{
printf(&quot;[%s] - %s\n&quot;, $FLD_dataIP, (($FLD_dataIP in arrConf) ? arrConf[$FLD_dataIP] : &quot;Not found&quot);
}


vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[jonnl0715]

hello Vlad,

that worked, many thanks for your help.

Cheers/Jon