Plot a wav file - wav2png

#!/bin/sh
#usage: wav2png.sh file.wav


BASE=${1%.wav}
PNG=$BASE.png
WAV=$BASE.wav
DAT=$BASE.dat

#echo $BASE,$PNG,$WAV,$DAT
sox $WAV $DAT
grep -v '^;' $DAT >$DAT.clean
FREQ=`head -1 $DAT|tr -d ';'`

echo -e "set terminal png;set title '$FREQ';set output '$PNG'; plot '$DAT.clean'" |gnuplot

Split a midi file into separate tracks

Get the program:

wget http://interglacial.com/~sburke/pub/midi_splitter.pl


perl midi_splitter.pl /tmp/vanilla.mid
file vanilla*.mid
midi2abc vanilla.mid
midi2abc vanilla_t01_c00.mid >vanilla_t01.abc

Access internet hotspots in client mode with WRT54G

Linksys WRT54G (below version 5 because linksys later switched to vmware)

Load the sveasoft firmware. (I am using Alchemy-pre5.3 v2.04.4.8sv)

Put it in client mode with loopback off.

Here is a good tutorial:
http://www.engadget.com/2005/05/24/how-to-connect-your-linksys-wrt54g-network-to-the-internet/

ssh into the router and type:
~ # wl scan
~ # wl scanresults|tr -d '\n' |sed 's/noise/\n/g' |tr ']' '\n'|grep ^SSID|awk '{print $(NF-1),$2}' |sed 's/Mode://'|sort -n
-96 "zeus"
-94 "LF-X1U.00014A10A7C8"
-94 "wireless"
-89 "Doug"
-88 "GHOST"
-86 "COR-MDA-LAN"
-86 "linksys"
-86 "linksys"
-83 "default"
-83 "hpsetup"
-83 "linksys"
-78 "hpsetup"
-78 "linksys"
-74 "hirsh
-51 "link"

You will get a sorted list of the most powerfull access points in range.