mixed Net_FTP::execute (
Executes a given command on the server (the SITE EXEC command is added by the method).
string $command - The command to be executed (without SITE EXEC).
mixed - true on success, otherwise PEAR::Error.
The returned PEAR_Error object in case of an error is specific. There is only one errornumber which may occur. The message given by this error will contain the directory where the error occurred in "Execution of command '$command' failed". operation fails.
This function can not be called statically.