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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

iwgetid

IWGETID(8)						     Linux Programmer's Manual							IWGETID(8)

NAME

       iwgetid - Report ESSID, NWID or AP/Cell Address of wireless network

SYNOPSIS

       iwgetid [interface] [--raw] [--scheme] [--ap] [--freq]
			  [--mode] [--protocol] [--channel]

DESCRIPTION

       iwgetid	is used to find out the NWID, ESSID or AP/Cell Address of the wireless network that is currently used. The information reported is
       the same as the one shown by iwconfig, but iwgetid is easier to integrate in various scripts.
       By default, iwgetid will print the ESSID of the device, and if the device doesn't have any ESSID it will print its NWID.
       The default formatting output is pretty-print.

OPTIONS

       --raw  This option disables pretty-printing of the information. This option is orthogonal to the other options (except --scheme),  so  with
	      the appropriate combination of options you can print the raw ESSID, AP Address or Mode.
	      This  format is ideal when storing the result of iwgetid as a variable in Shell or Perl scripts or to pass the result as an argument
	      on the command line of iwconfig.

       --scheme
	      This option is similar to the previous one, it disables pretty-printing of the information and removes all characters that  are  not
	      alphanumerics (like space, punctuation and control characters).
	      The resulting output is a valid Pcmcia scheme identifier (that may be used as an argument of the command cardctl scheme).  This for-
	      mat is also ideal when using the result of iwgetid as a selector in Shell or Perl scripts, or as a file name.

       --ap   Display the MAC address of the Wireless Access Point or the Cell.

       --freq Display the current frequency or channel used by the interface.

       --channel
	      Display the current channel used by the interface. The channel is determined using the current frequency and the frequency list pro-
	      vided by the interface.

       --mode Display the current mode of the interface.

       --protocol
	      Display the protocol name of the interface. This allows to identify all the cards that are compatible with each other and accept the
	      same type of configuration.
	      This can also be used to check Wireless Extension support on the interface, as this is the only attribute that all drivers  support-
	      ing Wireless Extension are mandated to support.

SEE ALSO

       iwconfig(8), ifconfig(8), iwspy(8), iwpriv(8).

wireless-tools							 02 December 2003							IWGETID(8)
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