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Archive for the ‘bash’ tag

Capturing whole packet with tcpdump for analysis with wireshark

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Capturing the hole packet on your NIC for later analysis with wireshark

tcpdump -nnvvXSs 1514 -i em0 -w /tmp/em0.dumptcp

Will capture 1514 bytes of all packets on interface “em0” and dump it to the file “/tmp/em0.dumptcp”. You can then import the file into wireshark for analysis.
Explanation of Parameters
Text below is copied from tcpdump man page
-nn
Don’t […]

Written by manuel

May 24th, 2014 at 12:57 pm

Posted in IT

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List all mass storage devices with FreeBSD

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Get a list of installed mass storage devices with FreeBSD

egrep ‘ad[0-9]|da[0-9]|cd[0-9]|acd[0-9]’ /var/run/dmesg.boot

where:

ad -> IDE HDD

da -> SCSI HDD

cd -> IDE CD/DVD

acd-> SCSI CD/DVD

Here’s an example output:

da0 at ciss0 bus 0 scbus0 target 0 lun 0
da0: Fixed Direct Access SCSI-5 device
da0: 135.168MB/s transfers
da0: Command Queueing enabled
da0: 139979MB (286677120 512 byte sectors: 255H 32S/T 35132C)
da1 […]

Written by manuel

December 14th, 2011 at 2:02 pm

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FreeBSD watch network interface usage

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If you want to know the current network bandwith usage on a FreeBSD host, this will help you.

  1. systat -ifstat 1
                  /0   /1   /2   /3   /4   /5 [...]

Written by manuel

December 13th, 2011 at 12:39 pm

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Show all files in OS X’s finder

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By default the finder in OS X does not show all the files. You can still see the files if you use a terminal and type

$ ls -la

but sometimes you may need the finder to point to a particularly file. e.g. you want to load a hidden file in to an application. To force […]

Written by manuel

July 28th, 2011 at 9:15 am

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Howto converting UNIX timestamp into readable format using bash

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Howto converting UNIX timestamp into readable format using bash.

$ date -j -f “%s” 1299452400
Mon Mar 7 00:00:00 CET 2011

Get current UNIX timestamp

$ date -j +%s

Written by manuel

June 19th, 2011 at 11:00 am

Posted in IT

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