Am 02.12.2014 um 19:05 schrieb James B. Byrne:
I am attempting to get a script borrowed from DJB to work on my CentOS-6.6
box. Simplified it looks like this:
tcpdump -l -n -e port 53 \
| awk '{if ($14 ~ /A.*?/) print $15}' \
| while read domain ; do echo $domain ; done ;
The sticking point is the 'while read' construct. Run just as 'tcpdum | awk'
I get this:
english.stackexchange.com.
www.urbandictionary.com.
www.urbandictionary.com.
www.urbandictionary.com.
www.urbandictionary.com.
api.mywot.com.
a.udimg.com.
a.udimg.com.
fonts.googleapis.com.
. . .
Run with the 'while read $domain ; do echo ' pipe nothing appears whatsoever.
What am I doing wrong?
while read domain; do
echo ${domain}
done < <(tcpdump -l -n -e port 53 | awk '{if ($14 ~ /A.*?/) print $15}')
The "echo ${domain}" part is certainly just a simplification of a more
complex command to run on the variable. Else it would be pointless as
awk is printing out the domain field 15.
Alexander
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