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Generate random valid mac addresses
Shorter and more straightforward. Also in perl: $ perl -e 'print join(":", map { sprintf "%0.2X",rand(256) }(1..6))."\n"'

Get decimal ascii code from character
printf treats first char after single ' as numeric equivalent

Download from Rapidshare Premium using wget - Part 2
The download content part. NOTE: the '-c' seems to not work very well and the download stuck at 99% sometimes. Just finish wget with no problem. Also, the download may restart after complete. You can also cancel. I don't know if it is a wget or Rapidshare glitch since I don't have problems with Megaupload, for example. UPDATE: as pointed by roebek the restart glitch can be solved by the "-t 1" option. Thanks a lot.

Verify MD5SUMS but only print failures
All valid files are withheld so only failures show up. No output, all checks good.

generate random password
for Mac OS X

Monitor dynamic changes in the dmesg log.
Other logs can be monitored similarly, e.g. $ watch "tail -15 /var/log/daemon.log"

"Pretty print" $PATH, separate path per line
from: http://www.unix.com/shell-programming-and-scripting/28047-split-print-path.html

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Clear terminal Screen
Probably the quickest / easiest way to clear the screen.

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"


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