Your FTP Client undoubtedly has a way to display help information. A command line client may accept a help command, possibly with optional arguments.

Your FTP Client should also provide a way for you to display help information returned from the MSS FTP Service. This help information shows what the MSS FTP Service expects to receive from your FTP Client when you issue commands. It also provides a URL that points to this documentation. For example:

ftp> rhelp
214-The following commands are recognized:
 ABOR    ALLO    AUTH    CCC     CDUP    CLNT    CWD     EPRT    EPSV    
 FEAT    HELP    LIST    MODE    MDTM    MLSD    MLST    NLST    NOOP    
 OPTS    PASS    PASV    PBSZ    PORT    PROT    PWD     QUIT    REST    
 RETR    SITE    SIZE    STAT    STOR    STRU    SYST    TYPE    USER    
 Send 'HELP <command>' for command specifics.
214 Documentation available at http://www.cisl.ucar.edu/mss/ftp/

Documentation on a specific MSS FTP Service command can also be obtained. For example:

ftp> rhelp allo
214 Syntax: ALLO <sp> <bytes>