mkpass.ksh

#!/usr/local/bin/ksh

RANDOM=$$

if [ "$#" -ne "1" ]; then
	echo "Usage: ${0##*/} PASSWORDLENTGH"
	echo "\te.g. ${0##*/} 8"
	exit 1
fi

if [ ! -z `echo "$1" | tr -d "[:digit:]"` ]; then
	echo "Usage: ${0##*/} PASSWORDLENTGH"
	echo "\te.g. ${0##*/} 8"
	echo "\nError: PASSWORDLENGTH must be a number!"
	exit 1
fi

if [ ! "$1" -gt "0" ]; then
	echo "Usage: ${0##*/} PASSWORDLENTGH"
	echo "\te.g. ${0##*/} 8"
	echo "\nError: PASSWORDLENGTH must be greater then 0!"
	exit 1
fi

STRING='q w e r t y u i o p a s d f g h j k l z x c v b n m Q W E R T Y U I O P A S D F G H J K L Z X C V B N M 1 2 3 4 5 6 7 8 9 0 _ - ! ? = '

LENGTH="$1"

typeset -i index
index=1

IFS_SAV="$IFS"
IFS=" "

# Put $STRING in an array
for i in $(echo $STRING); do
	array[$index]=$i
	((index=index+1))
done

string_len=${#array[*]}

IFS="$IFS_SAV"

typeset -i pwlen
pwlen=0

PASS=""

while [ "$pwlen" -lt "$LENGTH" ]; do
	index=$(($RANDOM % $string_len))
	PASS="$PASS${array[$index]}"
	((pwlen=pwlen+1))
done

echo $PASS
exit 0