Commands using alias (240)

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Concatenates lines using sed

Execute a command at a given time

Pause and Resume Processes
Add that and "cont () { ps -ec | grep $@ | kill -SIGCONT `awk '{print $1}'`; }" (without the quotes) to you bash profile and then use it to pause and resume processes safely

Remove old unused kernels from Red Hat Enterprise Linux 5 & Fedora 12/13
Install using yum install yum-utils Options include: --oldkernels Remove old kernel and kernel-devel packages --count=KERNELCOUNT Number of kernel packages to keep on the system (default 2) use package-cleanup --help for a complete list

See entire packet payload using tcpdump.
This command will show you the entire payload of a packet. The final "s" increases the snaplength, grabbing the whole packet.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Exclude a string with awk

Retrieve top ip threats from http://isc.sans.org/sources.html and add them into iptables output chain.
Retrieve top ip threats from http://isc.sans.org/sources.html and add them into iptables output chain.

ls -qaltr # list directory in chronological order, most recent files at end of list
I find it very handy to be able to quickly see the most recently modified/created files in a directory. Note that the "q" option will reveal any files with non-printable characters in their filename.

Capture data in ASCII. 1500 bytes
Sniffing traffic on port 80 only the first 1500 bytes


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