FileOps FileOps RCP
Ftp is the user interface to the ARPANET standard File Transfer
Protocol (FTP). For convenience, from here on after `
FTP' will be
referred to as the main file transfer program used in Theory and
PPPL. It allows two-way transfer of binary and text files between the
Suns, the VAXes, and the Crays. FTP also works on the Macs under NCSA
Telnet (you must run it on the remote machine), but other methods
prove more convenient (see Mac). If the remote
machine with which FTP is to communicate is specified, FTP immediately
attempts to connect to the server on that host; otherwise it directly
enters its command interpreter mode and displays the prompt
The best way to learn FTP is through example, so here's what it
would look like to run FTP on Lyman to copy the file `
from Cray A:
Connected to a.nersc.gov.
220 a FTP server (Version 5.2 Fri Sep 7 14:09:58 CDT 1990) ready.
Name (a.nersc.gov:karney): u6225
331 Password required for u6225.
230 User u6225 logged in.
200 PORT command successful.
150 Opening ASCII mode data connection for intro.texi (3697 bytes).
226 Transfer complete.
local: intro.texi remote: intro.texi
3697 bytes received in 0.042 seconds (86 Kbytes/s)
The most useful commands while in the
changes' to the current directory and echoes it on the screen).
The file `
.netrc' is very useful for transferring files
because it allows the user to save time from the tedious task of having
to log in and enter a password every time to run FTP. In the above
example, when FTP looked in your `
.netrc' file and found
a.nersc.gov', your username, and your password, you would bypass the
login procedure and save time. However, since this also forces the user
to store passwords in unencrypted form in the file, using the
.netrc' method is strongly discouraged. If you will be
using FTP very often, look into getting an NFS mount
Many hosts also offer a service known as `
anonymous FTP,' which
allows users without accounts on the remote machine to have limited
access in retrieving (and sometimes storing) files. The convention is to
type anonymous as the username and give your real username as the
password. Anonymous accounts are usually restricted to FTP only---free
software such as Emacs, X-Windows, and TeX are obtained this way.