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Full Discussion: Can't Output Piped Perl In-line command to a File
Top Forums Shell Programming and Scripting Can't Output Piped Perl In-line command to a File Post 302770230 by ConcealedKnight on Thursday 14th of February 2013 11:29:57 PM
Old 02-15-2013
I just figured out which command's the culprit. It seemed that the tcpdump doesn't play nicely with the stdout when combined with a pipe. Although I still don't know why yet as I am currently not in the mood to read the info and man pages this late.

I had to run three command executions to get the result I wanted. Here's the code in case you're wondering:
Quote:
(tcpdump -l -n -t "tcp[13] == 18" > /tmp/removeme) && cat /tmp/removeme | perl -ane '($s,$j)=split(/,/,$F[7],2); print "$s\n";' > ./graphme && rm /tmp/removeme
Thanks though.
 

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LEARN ABOUT DEBIAN

ovs-tcpundump

ovs-tcpundump(1)						Open vSwitch Manual						  ovs-tcpundump(1)

NAME

       ovs-tcpundump - convert ``tcpdump -xx'' output to hex strings

SYNOPSIS

       ovs-tcpundump < file

       Common options:
	      [-h | --help] [-V | --version]

DESCRIPTION

       The ovs-tcpundump program reads tcpdump -xx output on stdin, looking for hexadecimal packet data, and dumps each Ethernet as a single hexa-
       decimal string on stdout.  This format is suitable for use with the ofproto/trace command supported by ovs-vswitchd(8) via ovs-appctl(8).

       At least two -x or -X options must be given, otherwise the output will omit the Ethernet header, which prevents the output from being using
       with ofproto/trace.

OPTIONS

       -h, --help
	      Prints a brief help message to the console.

       -V, --version
	      Prints version information to the console.

SEE ALSO

       ovs-appctl(8), ovs-vswitchd(8), ovs-pcap(1), tcpdump(8), wireshark(8).

Open vSwitch							   December 2010						  ovs-tcpundump(1)
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