Transfers files between a local and a remote host.
The ftp command uses the File Transfer Protocol (FTP) to transfer files between the local host and a remote host or between two remote hosts.
The FTP protocol allows data transfer between hosts that use dissimilar file systems. Although the protocol provides a high degree of flexibility in transferring data, it does not attempt to preserve file attributes (such as the protection mode or modification times of a file) that are specific to a particular file system. Moreover, the FTP protocol makes few assumptions about the overall structure of a file system and does not provide or allow such functions as recursively copying subdirectories.
At the ftp> prompt, you can enter subcommands to perform tasks such as listing remote directories, changing the current local and remote directory, transferring multiple files in a single request, creating and removing directories, and escaping to the local shell to perform shell commands. See the Subcommands section for a description of each subcommand.
If you execute the ftp command and do not specify the HostName parameter for a remote host, the ftp command immediately displays the ftp> prompt and waits for an ftp subcommand. To connect to a remote host, execute the open subcommand. When the ftp command connects to the remote host, the ftp command then prompts for the login name and password before displaying the ftp> prompt again. The ftp command is unsuccessful if no password is defined at the remote host for the login name.
The ftp command interpreter, which handles all subcommands entered at the ftp> prompt, provides facilities that are not available with most file-transfer programs, such as:
These facilities help simplify repetitive tasks and allow you to use the ftp command in unattended mode.
The command interpreter handles file-name parameters according to the following rules:
For example, the append and put subcommands perform file-name expansion and then use only the first file name generated. Other ftp subcommands, such as cd, delete, get, mkdir, rename, and rmdir, do not perform file-name expansion and take the pattern-matching characters literally.
To end an ftp session when you are running interactively, use the quit or bye subcommand or the End of File (Ctrl-D) key sequence at the ftp> prompt. To end a file transfer before it has completed, press the Interrupt key sequence. The default Interrupt key sequence is Ctrl-C. The stty command can be used to redefine this key sequence.
The ftp command normally halts transfers being sent (from the local host to the remote host) immediately. The ftp command halts transfers being received (from the remote host to the local host) by sending an FTP ABOR instruction to the remote FTP server and discarding all incoming file transfer packets until the remote server stops sending them. If the remote server does not support the ABOR instruction, the ftp command does not display the ftp> prompt until the remote server has sent all of the requested file. Additionally, if the remote server does something unexpected, you may need to end the local ftp process.
The ftp command also handles security by sending passwords to the remote host and permits automatic login, file transfers, and logoff.
If you execute the ftp command and specify the host name (HostName) of a remote host, the ftp command tries to establish a connection to the specified host. If the ftp command connects successfully, the ftp command searches for a local $HOME/.netrc file in your current directory or home directory. If the file exists, the ftp command searches the file for an entry initiating the login process and command macro definitions for the remote host. If the $HOME/.netrc file or automatic login entry does not exist the ftp command prompts the user for a user name and password. The command displays the prompt whether or not the HostName parameter is specified on the command line.
If the ftp command finds a $HOME/.netrc automatic login entry for the specified host, the ftp command attempts to use the information in that entry to log in to the remote host. The ftp command also loads any command macros defined in the entry. In some cases (for example, when the required password is not listed in an automatic login entry), the ftp command prompts for the password before displaying the ftp> prompt.
Once the ftp command completes the automatic login, the ftp command executes the init macro if the macro is defined in the automatic login entry. If the init macro does not exist or does not contain a quit or bye subcommand, the ftp command then displays the ftp> prompt and waits for a subcommand.
The ftp command will use the extensions to ftp specifications as defined in IETF draft document "draft-ietf-cat-ftpsec-09.txt". The FTP security extensions will be implemented using the Generic Security Service API (GSSAPI) security mechanism. The GSSAPI provides services independent to the underlying security and communication mechanism. The GSSAPI is defined in rfc 1508 and 1509.
The ftp command will use the AUTH and ADAT commands to authenticate with the ftpd daemon. If both support Kerberos authentication, then they will use the local users DCE credentials to authenticate the user on the remote system. If this fails and Standard authentication is configured on both systems, the process described above will be used.
The HostName parameter is the name of the host machine to which files are transferred. The optional Port parameter specifies the ID of the port through which to transmit. (The /etc/services file specifies the default port.)
The following ftp subcommands can be entered at the ftp> prompt. Use double quotation marks(" ") to specify parameters that include blank characters.
$ ftp canopus Connected to canopus.austin.century.com. 220 canopus.austin.century.com FTP server (Version 4.1 Sat Nov 23 12:52:09 CST 1991) ready. Name (canopus:eric): dee 331 Password required for dee. Password: 230 User dee logged in. ftp> help Commands may be abbreviated. Commands are: ! delete mdelete proxy runique $ debug mdir sendport send account dir mget put size append disconnect mkdir pwd status ascii form mls quit struct bell get mode quote sunique binary glob modtime recv system bye hash mput remotehelp tenex case help nmap rstatus trace cd image nlist rhelp type cdup lcd ntrans rename user close ls open reset verbose cr macdef prompt rmdir ? clear private protect safe ftp> remotehelp 214-The following commands are recognized(* =>'s unimplemented). USER PORT RETR MSND* ALLO DELE SITE* XMKD CDUP PASS PASV STOR MSOM* REST* CWD STAT* RMD XCUP ACCT* TYPE APPE MSAM* RNFR XCWD HELP XRMD STOU REIN* STRU MLFL* MRSQ* RNTO LIST NOOP PWD QUIT MODE MAIL* MRCP* ABOR NLST MKD XPWD AUTH ADAT PROT PBSZ MIC ENC CCC 214 Direct comments to ftp-bugs@canopus.austin.century.com. ftp> status Connected to canopus.austin.century.com. No proxy connection. Mode: stream; Type: ascii; Form: non-print; Structure: file Verbose: on; Bell: off; Prompting: on; Globbing: on Store unique: off; Receive unique: off Case: off; CR stripping: on Ntrans: off Nmap: off Hash mark printing: off; Use of PORT cmds: on ftp> bell Bell mode on. ftp> prompt Interactive mode off. ftp> runique Receive unique on. ftp> trace Packet tracing on. ftp> verbose Verbose mode off. ftp> quit $
$ ftp canopus Connected to canopus.austin.century.com. 220 canopus.austin.century.com FTP server (Version 4.1 Sat Nov 23 12:52:09 CST 1991) ready. Name (canopus:eric): dee 331 Password required for dee. Password: 230 User dee logged in. ftp> pwd 257 "/home/dee" is current directory. ftp> cd desktop 250 CWD command successful. ftp> type ascii 200 Type set to A. ftp> send typescript 200 PORT command successful. 150 Opening data connection for typescript (128.114.4.99,1412). 226 Transfer complete. ftp> cdup 250 CWD command successful. ftp> bye 221 Goodbye. $
$ ftp canopus Connected to canopus.austin.century.com. 220 canopus.austin.century.com FTP server (Version 4.1 Sat Nov 23 12:52:09 CST 1991) ready. 331 Password required for dee. 230 User dee logged in. ftp> cdup 250 CWD command successful. ftp> pwd 257 "/home" is current directory. ftp> dir 200 PORT command successful. 150 Opening data connection for /usr/bin/ls (128.114.4.99,1407) (0 bytes). total 104 drwxr-xr-x 2 system 32 Feb 23 17:55 bin Drwxr-xr-x 26 rios 4000 May 30 17:18 bin1 drwxr-xr-x 2 system 32 Feb 23 17:55 books drwxrwxrwx 18 rios 1152 Jun 5 13:41 dee -r--r--r-- 1 system 9452 May 17 12:21 filesystems drwxr-xr-x 2 system 32 Feb 23 17:55 jim drwxr-xr-x 5 system 80 Feb 23 17:55 krs drwxrwxrwx 2 rios 16432 Feb 23 17:36 lost+found -rwxr-xr-x 1 rios 3651 May 24 16:45 oldmail drwxr-xr-x 2 system 256 Feb 23 17:55 pubserv drwxrwxrwx 2 system 144 Feb 23 17:55 rein989 drwxr-xr-x 2 system 112 Feb 23 17:55 reinstall 226 Transfer complete. ftp> delete oldmail 250 DELE command successful. ftp> mdir /home/dee/bin binlist output to local-file: binlist? y 200 PORT command successful. 150 Opening data connection for /usr/bin/ls (128.114.4.99,1408) (0 bytes). 226 Transfer complete. ftp> close 221 Goodbye. ftp> quit $
/usr/samples/tcpip/netrc | Contains the sample .netrc file. |
/etc/syslog.conf | Contains configuration information for the syslogd daemon. |