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UMODEM.1
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1987-01-09
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'\" t
.TH umodem 1 "Local"
.SH NAME
umodem \- file transfer to and from personal computers
.SH SYNOPSIS
.B umodem\
\fB-rb\fR | \fB-rt\fR | \fB-sb\fR | \fB-st\fR [ \fBqlmdy7\fR ] \fIfilename\fR
.br
.SH DESCRIPTION
This command is used to transfer files to and from a Personal Computer
using the standard "CP/M User's Group (Ward Christensen)" protocol.
\fIUmodem\fR can be used to transfer one file at a time either to the PC or
from the PC, and is compatible with most file transfer programs running on
the PC.
.SH "umodem"
.I Umodem
cooperates with the a multitude of programs that run
on a Personal Computer to perform a file transfer.
The integrity of the transfer is enhanced by use of a block checksum
for error detection, and block retransmission for error correction.
.PP
.I Umodem
requires exactly one of the following :
.TP 8
.B -rb
Receive Binary \- transfer a file
.I from
the Personal Computer, in raw binary mode. Every byte of the file will be
transferred intact. This mode is usually used to transfer, for example, .COM
files.
.TP
.B -rt
Receive Text \- transfer a file
.I from
the Personal Computer, in text mode. In this mode the program attempts to
convert from the CP/M text file format to the Unix format on-the-fly,
by stripping carriage-return characters, and by ceasing to store data
after a Control-Z is detected.
.TP
.B -sb
Send Binary \- transfer a file
.I to
the Personal Computer, in raw binary mode. Every byte of the file will be
transferred intact. This mode is usually used to transfer, for example, .COM
files.
.TP
.B -st
Send Text \- transfer a file
.I to
the Personal Computer, in text mode. In this mode the program attempts to
convert from the Unix text file format to the CP/M format on-the-fly,
by adding carriage-return characters, and by appending a control-z
character to the end of the file.
.PP
In addition,
.I umodem
recognizes the following options:
.TP 8
.B q
Quiet option - the initial "boiler plate" of program name,
file size, etc., is suppressed.
.TP
.B l
Logfile option - enables logging the progress of the file transfer.
This option is primarily useful for debugging.
.TP
.B m
"Mung-mode" option - unless this option is specified, an attempt to
receive a
.I filename
that already exists will be denied. With this option, the existing file
is overwritten.
.TP
.B d
Delete the logfile, if it exists, before starting.
.TP
.B y
Display file status (size) information only.
.TP
.B 7
Seven-bit transfer option - strip off the high-order bit of each byte
before it is sent (\f2-st\f1 case) or stored (\f2-rt\f1 case).
This option is valid only for text-mode transfers.
.PP
\fIUmodem\fR supports only the checksum block
error check, and not the more robust CRC.
It supports neither the MODEM7 nor the YAM batch file transfer
protocols. Only single file transfers are supported.
.SH FILES
$HOME/umodem.log - created or appended to if the
.B "-l"
option is specified.