Tool to manage power for ppc Linux

ACPI is n/a for ppc. Same for apm. Those don't work with the ppc hardware. Pbbuttonsd controls sleep and hibernate. And for PPC Linux, you must have an ATI graphics card for sleep to work. Nvidia and anything else will not work.



$ sudo pbbcmd hibernate

or

$ sudo pbbcmd sleep

or

$ sudo pbbuttonsd sleep

or

$ sudo pbbuttonsd hibernate

Python - test urlopen function

import urllib
f = urllib.urlopen("http://www.google.com")
print f.read()

Flash Card to Moodle xml

#example flashcard questions:
Which switch would you use with the echo command to enable the "backslash" options? ------ -e
Which switch would you use with the find utility to cause another command to run without prompting you? ------ -exec

#shell script
#!/bin/sh
converted="converted.xml"
sep="------"

if [[ $# -ne 1 ]]
then
        echo "$0 file_to_convert"
        exit 1
fi

echo "starting conversion to moodle xml"

if [[ -f $converted ]]
then
        echo "$converted already exists"
        rm $converted
fi

echo '<?xml version="1.0" ?>' > $converted
echo "<quiz>" >> $converted

i=1

cat $1 | while read line
do

        q=`echo $line  | awk -F"$sep" '{  print $1 }'`
        a=`echo $line | awk -F"$sep" '{  print $2 }'`
        echo '<question type="shortanswer">' >> $converted
        echo '<name>' >> $converted
        echo "<text>Question $i</text>" >> $converted
        echo '</name>' >> $converted
        echo '<questiontext format="html">' >> $converted
        echo "<text>$q</text>" >> $converted
        echo '</questiontext>' >> $converted
        echo '<answer fraction = "100">' >> $converted
        echo "<text>$a</text>" >> $converted
        echo '<feedback><text>Correct!</text></feedback>' >>$converted
        echo '</answer>' >> $converted
        echo '</question>' >> $converted

        ((i=i+1))

done
echo '</quiz>' >> $converted

Linux - wireless commands

wireless commands

iwlist wlan0 scan
wevent &
iwconfig wlan0 key open xxxxx
iwconfig wlan0 essid xxxx

Set program output to environment variable in batch file

FOR /F "tokens=*" %A IN ('prog.exe') DO SET ENVVAR=%A

gcc, gdb and make commands

Macro definition
gcc -D DUMMY_DEF -c test_str.c

Makefile arguments
test:
./program $(PROG_ARGS)

make test PROG_ARGS='testfile1.txt'

gdb commands
run args - runs program
frame - examines current frame
up - examines previous frame

Mount smb from command line

mount -t smbfs //username@ip/share mountpt

Mortgage calculator - bash script

This simply outputs the monthly mortgage payment.

Takes five arguments : principle years interest points fees

For instance,

bash mortgage.sh 100000 5 .075 0 0

Outputs

Principle + fees = 100000 , Years = 5 , Months = 60 , interest .006250000000
Points = 0 , 0
2003.794859563881

#!/bin/sh

if [[ $# -ne 5 ]]
then
 echo "enter 5 args : principle years interest points fees"
  exit
  fi

  prin=$1
  ((mon=$2 * 12 ))
  inter=`echo "scale=12;$3/12" | bc`
  pts=`echo "scale=12; $prin * $4" | bc`
  fee=$5
  prin=`echo "scale=12;$prin + $fee" | bc`


  echo "Principle + fees = $prin , Years = $2 , Months = $mon , interest $inter"
  echo "Points = $4 , $pts"

  prin=`echo "scale=12; $prin - $pts" | bc`


  echo `echo "scale=12;($prin*$inter)*((1+$inter)^$mon)/(((1+$inter)^$mon)-1)"|bc`
  echo "the monthly payment : $new_prin"

start menu pin list location

> If I pin a shortcut to the startmenu, where does XP store this
> information?

With a shortcut in this folder...
C:\Documents and Settings\All Users\Start Menu

The above folder would be the easiest.

Also here...
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Explorer\MenuOrder\Start Menu2\Programs
Value Name: Order

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Explorer\StartPage
Value Name: Favorites
Value Name: FavoritesResolve

All of those are REG_BINARY values and hard to read them.

Bash - Gaussian Elimination Op count example

#!/bin/sh

if [[ $# -ne 2 ]]
then
 exit
fi

echo " m $1 by n $2 matrix"

n=$2
m=$1
mult=0
add=0
c=0

for ((i=1;i < m;i++))
do
 echo "row = i = $i"
 for ((j=i;j < m;j++))
 do
  ((mult=mult + (n-i+1)))
  ((add=add + (n-i+1)))
 done
 ((c=c+(m-i)*(n-i+1)))
done
echo "additions = $add"
echo "mults = $mult"
echo "summation = $c"

Matlab - simple newton's method ex

function r = doNewton(f,x0,x,err)
 
 while abs(x0 - x) > err
  
  x0, (x0 - x)

  x0 = x0 - (polyval(f,x0))/polyval(polyder(f),x0);

  
 end
 
 

 r = x0;
end