Script to generate files

March 2013

The script takes in some simple arguments and then generates a folder structure and randomizes the size of the files outputted to simulate user generated content. This can be helpful when testing performance of desktop sync applications.

	#!/bin/bash

	if [ $# -ne 4 -a $# -ne 5 ]
	then
	echo "Usage: generatefiles <depth> <num of folders per depth> <num of files per folder> <max size of file> [<min size of file>]"
	exit -1
	fi

	declare path=$(pwd)
	declare numDepth=$1
	declare numFolders=$2
	declare numFiles=$3
	declare maxSize=$4
	declare minSize=0


	CreateFolders(){
	local depth=$1
	local folderRoot=$2
	local name=$3
	CreateFiles $folderRoot folder$name
	if [ $depth -eq $numDepth ]
	then
	return;
	fi
	local newDepth=$((depth + 1))

	local folderIndex=1;
	for (( ; folderIndex <= $numFolders; folderIndex++ ))
	do
	local folderName=$name-$folderIndex
	fullFolderName=$folderRoot/folder$folderName
	mkdir $fullFolderName
	echo fullFolderName: $fullFolderName

	local newRoot=$folderRoot/folder$folderName
	CreateFolders "$newDepth" "$newRoot" "$folderName"
	done
	}

	CreateFiles()
	{
	local folderRoot=$1
	local folderName=$2
	local fileIndex=1;
	for (( ; fileIndex <= $numFiles; fileIndex++ ))
	do
	local fileName=file$folderName-$fileIndex.txt
	CreateFile "$fileName" "$folderRoot"
	done
	}

	CreateFile()
	{
	local fileName=$1
	local folderRoot=$2
	local fullFileName=$folderRoot/$fileName
	echo fullFileName: $fullFileName
	random32=$(( ( ($RANDOM & 3)<<30 \| $RANDOM<<15 \| $RANDOM ) & 0x7FFFFFFF ))
	randomSize=$((random32%$maxSize))
	if [ $randomSize -lt $minSize ]
	then
	randomSize=$minSize
	fi
	echo randomSize:$randomSize maxSize:$maxSize
	LC_CTYPE=C tr -cd '0-9a-zA-Z!@#$%^&*_+-' < /dev/urandom \| head -c $randomSize > $fullFileName
	}


	if [ $# -eq 5 ]
	then
	minSize=$5
	fi

	echo path: $path numDepth: $numDepth numFolders: $numFolders numFiles: $numFilesecho maxSize: $maxSize minSize: $minSize

	time=$(date -u \| tr ": " "--")
	echo $time
	Syncpoint=$path/$time
	mkdir $Syncpoint
	CreateFolders "0" "$Syncpoint" ""

view raw generatefiles.sh hosted with ❤ by GitHub

$ bash generatefiles.sh 2 2 3 1024
Generates 2 level deep with 2 folders in each level. Each folder has 3 files that are between 0bytes and 1KB

The above command would generate a folder structure two levels deep, with two folders at each level, with three files in each folder, files having a max size of one kilobyte and a minimum size of zero bytes.

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