دو دستور FTP چه کار می کنه ؟

درود ، دو تا دستور در مورد FTP هست و در RFC هم پیدا کردم اما متوجه نشدم .

دستور acct و site

ACCOUNT (ACCT)

The argument field is a Telnet string identifying the user's

account. The command is not necessarily related to the USER

command, as some sites may require an account for login and

others only for specific access, such as storing files. In

the latter case the command may arrive at any time.

There are reply codes to differentiate these cases for the

automation: when account information is required for login,

the response to a successful PASSword command is reply code

332. On the other hand, if account information is NOT

required for login, the reply to a successful PASSword

command is 230; and if the account information is needed for

a command issued later in the dialogue, the server should

return a 332 or 532 reply depending on whether it stores

(pending receipt of the ACCounT command) or discards the

command, respectively.

SITE PARAMETERS (SITE)

This command is used by the server to provide services

specific to his system that are essential to file transfer

but not sufficiently universal to be included as commands in

the protocol. The nature of these services and the

specification of their syntax can be stated in a reply to

the HELP SITE command.

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