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check open ports without netstat or lsof

Obtain last stock quote from google API with xmlstarlet

list directories only

Get your external IP address
Request all information about my IP address in json format

Batch rename extension of all files in a folder, in the example from .txt to .md

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"

What is the use of this switch ?
e.g. $ manswitch grep -o This will take you to the relevant part of the man page, so you can see the description of the switch underneath.

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

Rename files in batch

print file without duplicated lines usind awk
show file withou duplicated lines


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