[CentOS] Help with at Bash script

Hal Wigoda
Wed, 03 Dec 2014 04:28:32 -0000

You have to do
     cat domain
in back tiks

instead of read domain.

(Sent from iPhone, so please accept my apologies in advance for any spelling or
grammatical errors.)

> On Dec 2, 2014, at 12:05 PM, James B. Byrne <byrnejb at
harte-lyne.ca> wrote:
>
> 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?
>
> --
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> James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
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