# The required _varibales_ for ease of coding, these are the colours...
# White On Black.
WOB="x1B[1;37;40m"
# Black On Green.
BOG="x1B[1;30;42m"
# Black On Yellow.
BOY="x1B[1;30;43m"
# Black On red.
BOR="x1B[1;30;41m"
# Green On Black.
GOB="x1B[1;32;40m"
# Yellow On Black.
YOB="x1B[1;33;40m"
# Red On Black.
ROB="x1B[1;31;40m"

# Set the pseudo 6 bit value to zero.
SIX_BIT_DEPTH=0

# Do a clear screen to White On Black.
printf $WOB
clear

while true
do
# Set up the screen per scan and prepare for the bargraph.
clear
printf $WOB"n $VER: Bargraph_Generator.sh_Version_0.00.10_(C)2012_B.Walker_G0LCU.nn"
printf " A horizontal, at a glance, coloured, analogue bargraph display forn"
printf " a default Terminal inside OSX 10.7.5..nnnnn"
printf " 0 10 20 30 40 50 60"
printf $GOB"n +----+----+----+----+----+----+----+----+----+"$YOB"----+----+"$ROB"----+--n"
printf $GOB" (| "$ROB")n"
printf $GOB" +----+----+----+----+----+----+----+----+----+"$YOB"----+----+"$ROB"----+--nnnn"
# If the 6 bit value is 0, zero, do no more until printing the 6 bit value and generating another 6 bit value...
# Anything greater than or equal to 1 enters this conditional branch.
if [ "$SIX_BIT_DEPTH" -ge "1" ]
then
# If the 6 bit value is less than or equal to 46 then _plot_ the green section only.
# The 'x1B[12;8f' is the ANSI 'Esc' code that forces the print position to 12 lines by 8 columns.
if [ "$SIX_BIT_DEPTH" -le "46" ]
then
BARGRAPH=$GOB"x1B[12;8f("$BOG
for green in $(seq 1 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
# If the 6 bit value is greater than or equal to 47 then print the green section and _plot_ the yellow section.
if [ "$SIX_BIT_DEPTH" -ge "47" ]
then
BARGRAPH=$GOB"x1B[12;8f("$BOG" "$BOY
for yellow in $(seq 47 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
# If the 6 bit value is greater than or equal to 57 then print the green and yellow section and _plot_ the red section.
if [ "$SIX_BIT_DEPTH" -ge "57" ]
then
BARGRAPH=$GOB"x1B[12;8f("$BOG" "$BOY" "$BOR
for red in $(seq 57 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
printf "$BARGRAPH"$GOB"nnnnn"
fi
# When the 6 bit value is greater than or equal to 61 sound a system error beep.
if [ "$SIX_BIT_DEPTH" -ge "61" ]
then
printf "a"
fi
# Print the 6 bit value in White On Black...
printf $WOB" Random number generated "$SIX_BIT_DEPTH"...nn"
printf " Press Ctrl-C to stop the program...nn"
# Generate another 6 bit value as though from an 8 bit value...
SIX_BIT_DEPTH=$[($RANDOM % (256/4))]
# A practical lower limit for the sleep command is 'sleep 0.05'...
sleep 1
done