php shell_exec（）放入以获得文本文件

rate -c 192.168.122.0/24

shell_exec(\'rate -c 192.168.122.0/24\')

$handle = popen(\'/path/to/executable 2>&1\', \'r\');
echo \"\'$handle\'; \" . gettype($handle) . \"\\n\";
$read = fread($handle, 2096);
echo $read;
pclose($handle);

rate -c 192.168.122.0/24 > file.txt

shell_exec(\'rate -c 192.168.122.0/24 > file.txt\');

    $output = shell_exec(\'rate -c 192.168.122.0/24\');
    $fh = fopen(\'output.txt\',\'w\');
    fwrite($fh,$output);
    fclose($fh);

$path_to_file = \'path/to/your/file\';
$write_command = \'rate -c 192.168.122.0/24 >> \'.$path_to_file;
shell_exec($write_command);