#!/bin/bash

#            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#                    Version 2, December 2004
#
# Copyright (C) 2011 Emmanuel Revah <manu@manurevah.com>
#
# Everyone is permitted to copy and distribute verbatim or modified
# copies of this license document, and changing it is allowed as long
# as the name is changed.
#
#            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
#
#  0. You just DO WHAT THE FUCK YOU WANT TO.


##### Config (uration) #####
# QTY of files to create
QTY=500

# Where to create new files ?
OUTPUT="/tmp"

# Min and Max size per file in kB
MIN=10
MAX=1000

# Max number of directories to create
MAXDIR=500
############## END CONFIG #############


# Correct MIN and MAX and check
MAX=`expr $MAX - $MIN + 1`
if [[ ${MAX} < 0 ]]; then
	echo "ERROR: MAX is lower than MIN, and vice versa."
	exit
fi

for i in $(seq 1 $QTY); do
	echo "File number -> $i"
	DDCOUNT=$[ ( $RANDOM % $MAX )  + $MIN ]
	DIR=$[ ( $RANDOM % $MAXDIR )  + 1 ]

	# uncomment and use "$OUTPUT/$DIR/${i}_$FILENAME" to avoid rewriting over previous random files
	#FILENAME=`head -n1 /dev/urandom | md5sum| awk {'print $1'}`

	if [ ! -d $OUTPUT/$DIR ]; then
		mkdir -p $OUTPUT/$DIR
	fi
	dd bs=1024 count=$DDCOUNT skip=0 if=/dev/urandom of=$OUTPUT/$DIR/${i} 2> /dev/null
done