On Nov 28, 2016, at 3:39 PM, Sergio Garcia Gutierrez <sgarcia....@gmail.com>
wrote:
> When i execute this line "sudo tcpdump -vvv dst host 'your IP' & port 80"
> You CANT STOP TCPDUMP using "Ctrl + C".
That's because you made it a background job.
If you type the command
sudo tcpdump -vvv dst host 'your IP' & port 80
that's interpreted by the shell as the two commands
sudo tcpdump -vvv dst host 'your IP'
and
port 80
with an "&" between them. The "&" means "put the command typed before it into
the background, so it runs the command
sudo tcpdump -vvv dst host 'your IP'
in the background, and then runs the command
port 80
> So i closed terminal and opened new one. I exectued again the same code and
> it says to me:
>
> CANT FIND ORDER «port», YOU MAY SAY:
> The order «prt» of package «prt» (universe)
> The order «pork» of package «pork» (universe)
> The order «psort» of package «radiance» (universe)
> The order «poet» of package «libpoet-perl» (universe)
> The order «sort» of package «coreutils» (main)
> port: Cant find an order
It's complaining about the command "port 80"; I guess "port" is a valid
command, but "80" isn't a valid argument to it.
> [1]+ STOPPED sudo tcpdump -vvv dst host 'your IP'
>
> [1]- STOPPED sudo tcpdump -vvv dst host 'your IP'
>
> [2]+ STOPPED sudo tcpdump -vvv dst host 'your IP'
That says that there are two
sudo tcpdump -vvv dst host 'your IP'
commands running in the background.
You need to move them to the foreground to terminate them:
fg %2
moves the [2] command to the foreground; type ^C.
Then do
fg %1
to move the [1] command to the foreground, and type ^C.
*Then*, what you need to do is
sudo tcpdump -vvv "dst host 'your IP' & port 80"
putting the entire filter in quotes, so "&" is treated as part of the filter,
rather than as a "put the command in the background" indication to the shell,
or do
sudo tcpdump -vvv dst host 'your IP' and port 80
which avoids using "&" - "and" will be treated as part of the filter, rather
than as a "put the command in the background" indication to the shell.
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