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Command to rename multiple file in one go
An entirely shell-based solution (should work on any bourne-style shell), more portable on relying on the rename command, the exact nature of which varies from distro to distro.

find and delete empty dirs, start in current working dir

df without line wrap on long FS name

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"

Show which programs are listening on TCP ports
Alternative: $ ss -tlpn

Load average + API google chart
limite = threshold

check open ports without netstat or lsof

Poke a Webserver to see what it's powered by.
the good: Server: Apache/2.2.8 (Ubuntu) PHP/5.2.4-2ubuntu5.4 with Suhosin-Patch the bad: Server: Microsoft-IIS/6.0 and the ugly: Server: Apache/2.2.10 (Win32) mod_ssl/2.2.10 OpenSSL/0.9.8i PHP/5.2.6

Clone IDE Hard Disk
This command clone the first partition of the primary master IDE drive to the second partition of the primary slave IDE drive (!!! back up all data before trying anything like this !!!)

Find the package that installed a command


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