Freebsd下 批量修改dos格式文件为unix格式 并删除空行

#!/usr/local/bin/php-q
<?php
/*
用于批量修改windows下的文件格式为unix下的文件格式，
同时把连续的空白行去掉
*/
if($argc>1)
{
array_shift($argv);
$dir=$argv[0];
$type=$argv[1];
if($argv[2])
{
$ext="-maxdepth$argv[2]";
}
}
else
{
exit('noparames');
}
chdir($dir);
$command=sprintf('find.-typef-name"*.%s"',$type);
if($ext)
{
$command.=$ext;
}
//$command='find.-typef';
$str=shell_exec($command);
$arr=explode(" ",$str);
$command2="/usr/local/bin/dos2unix_FILE_";
$command3="/usr/bin/sed'/^$/d'_FILE_>_FILE2_";
for($i=0;$i<count($arr);$i++)
{
if(strlen($arr[$i])>3)
{
$cmd2=str_replace("_FILE_",$arr[$i],$command2);
print$cmd2." ";
shell_exec($cmd2);

$filename2=$arr[$i].'.bak';
$command33=str_replace("_FILE_",$arr[$i],$command3);
$cmd3=str_replace("_FILE2_",$filename2,$command33);
print$cmd3." ";
shell_exec($cmd3);

$cmd4="/bin/mv$filename2$arr[$i]";
print$cmd4." ";
print" ---------------------------------------------------------- ";
shell_exec($cmd4);

unset($cmd2,$cmd3,$cmd4,$filename2);

}
}
print"+====================================================================+ ";
print"parsefilenumber:".count($arr)." ";
?>