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000038_news@columbia.edu _Wed Mar 21 09:51:41 2001.msg
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From: fdc@columbia.edu (Frank da Cruz)
Subject: Re: What could Kermit implement from FTP?
Date: 21 Mar 2001 14:44:57 GMT
Organization: Columbia University
Message-ID: <99aep9$565$1@newsmaster.cc.columbia.edu>
To: kermit.misc@columbia.edu
In article <99ach7$3tq$1@newsmaster.cc.columbia.edu>,
Jeffrey Altman <jaltman@watsun.cc.columbia.edu> wrote:
: In article <3ab8aabf@news.iprimus.com.au>, DMC <devo_dave@hotmail.com> wrote:
: ...
: : ? Support for the 'page' file structure in addition to the file and record
: : structures
:
: Can you describe what you mean by the "Page" file structure?
:
Page mode is a leftover from TOPS-20, allowing direct access to disk pages
(blocks), the minimum addressable storage unit on the disk. A TOPS-20
file was defined by its page table, which could be sparse. Transferring a
file in page mode, as opposed to ascii or binary mode, would preserve its
sparseness.
You don't see this sort of thing very much any more. But TOPS-10 and
TOPS-20 are quietly coming back to life after lying dormant the last
fifteen years, with the recent appearance of PDP-10 emulation programs;
see the links at the end of:
http://www.columbia.edu/kermit/pdp10.html
The Kermit FTP client, although it does not support page mode, does
include two special commands to be used with PDP-10 FTP servers:
VDIRECTORY and TYPE TENEX. (And as noted here recently, TOPS-20 Kermit
recently had a facelift to allow faster file transfers for when the new
emulators come online, but don't have TCP/IP).
: : As for circumstances where a user might choose between Kermit or FTP,
: : i have only really mentioned the relative robustness of Kermit for use
: : on unreliable lines and/or LAN, X.25 connections, etc that are
: : unsupported by FTP. I have also mentioned possibly the overheads of
: : having to learn the Kermit interface as opposed to FTP are higher.
:
: In what way are Kermit's commands more difficult to learn than FTP commands?
:
In fact, Kermit's commands are almost identical with FTP commands: GET,
BINARY, BYE, etc. Most FTP commands that are different from Kermit's are
accepted as invisible synonyms to the regular Kermit programs; for example
PUT for SEND. Of course Kermit has more commands because it does more
things. If FTP did those things, it would have more commands too.
The main difference is that Kermit's file management commands (DIR,
DELETE, MKDIR, etc) work locally rather than being sent to the server. To
send commands to the FTP server from Kermit, you must use FTP DIR, FTP
DELETE, FTP MKDIR, etc (you can also use REMOTE DIR, REMOTE DELETE, etc,
as you would with a Kermit server, and there are also "R-command"
shortcuts for most of these: RCD, RDIR, RMKDIR, ....) See the command
comparison here:
http://www.columbia.edu/kermit/ckermit3.html#x3.8
- Frank