Commands using wc (172)

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Getting started with tcpdump
At some point you want to know what packets are flowing on your network. Use tcpdump for this. The man page is obtuse, to say the least, so here are some simple commands to get you started. -n means show IP numbers and don't try to translate them to names. -l means write a line as soon as it is ready. -i eth0 means trace the packets flowing through the first ethernet interface. src or dst w.x.y.z traces only packets going to or from IP address w.x.y.z. port 80 traces only packets for HTTP. proto udp traces only packets for UDP protocol. Once you are happy with each option combine them with 'and' 'or' 'not' to get the effects you want.

Stop Flash from tracking everything you do.
Brute force way to block all LSO cookies on a Linux system with the non-free Flash browser plugin. Works just fine for my needs. Enjoy.

Analyze awk fields
translate and number lines is simpler and you use tr to choose your delimiter (eg for csv files)

Display the standard deviation of a column of numbers with awk

Extract shortcuts and hostnames from .ssh/config
Spits out table that shows your Host->HostName aliases in ~/.ssh/config

Protect against buffer overflow
This command solve the problem ping: sendmsg: No buffer space available to.

Get Futurama quotations from slashdot.org servers

Selecting a random file/folder of a folder
Also looks in subfolders

Show all machines on the network
Depending on the network setup, you may not get the hostname.

tar+pbzip2 a dir


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