http://linux.about.com/od/commands/a/blcmdl1_ftpx.htm
下文件的时候，还是先切到binary后，比较容易成功。
The following examples illustrate typical uses of the command ftp
for remotely copying, renaming, and deleting files.
ftp abc.xyz.edu
This command will attempt to connect to the ftp server at abc.xyz.edu.
If it succeeds, it will ask you to log in using a username and
password. Public ftp servers often allow you to log in using the
username "anonymous" and your email address as password.
Once you are logged in you can get a list of the available ftp commands
using the help function:
ftp> help
This lists the commands that you can use to show the directory contents, transfer files, and delete files.
ftp> ls
This command prints the names of the files and subdirectories in the current directory on the remote computer.
ftp> cd customers
This command changes the current directory to the subdirecotry "customers", if it exists.
ftp> cd ..
Changes the current directory to the parent direcotry.
ftp> lcd images
Changes the current directory [em]on the local computer[/em] to "images", if it exists.
ftp> ascii
Changes to "ascii" mode for transferring text files.
ftp> binary
Changes to "binary" mode for transferring all files that are not text files.
ftp> get image1.jpg
Downloads the file
image1.jpg from the remote computer to the local computer. Warning: If
there already is file with the same name it will be overwritten.
ftp> put image2.jpg
Uploads the file
image2.jpg from the local computer to the remote computer. Warning: If
there already is file with the same name it will be overwritten.
ftp> !ls
A '!' in front will execute the
specified command on the local computer. So '!ls' lists the file names
and directory names of the current directory on the local computer.
ftp> mget *.jpg
With mget you can download multiple images. This command downloads all files that end with ".jgp".
ftp> mput *.jpg
Uploads all files that end with ".jgp".
ftp> mdelete *.jpg
Deletes all files that end with ".jgp".
ftp> prompt
Turns iteractive mode on or off so that commands on multiple files are executed without user confirmation.
ftp> quit
Exits the ftp program.