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For automated transfers between two sites, a number of add-ons to the XMODEM protocol were implemented over time. These generally assumed the sender would continue sending file after file, with the receiver attempting to trigger the next file by sending a NAK as normal at the start of a transfer.
In order to support automated transfers of FidoNet mail, MODEM7 introduced the ability to send the filename as plain text before sending the first block of data. This was not reliable, and TeLink improved this by placing the filename, and optionally other data like the creation date and file length, in a complete 128-byte packet.
Some modern text file formats (e.g. CSV-1203 [10]) still recommend a trailing EOF character to be appended as the last character in the file. However, typing Control + Z does not embed an EOF character into a file in either DOS or Windows , nor do the APIs of those systems use the character to denote the actual end of a file.
However, some file signatures can be recognizable when interpreted as text. In the table below, the column "ISO 8859-1" shows how the file signature appears when interpreted as text in the common ISO 8859-1 encoding, with unprintable characters represented as the control code abbreviation or symbol, or codepage 1252 character where available ...
ZMODEM is an inline file transfer protocol developed by Chuck Forsberg in 1986, in a project funded by Telenet in order to improve file transfers on their X.25 network. In addition to dramatically improved performance compared to older protocols, ZMODEM offered restartable transfers, auto-start by the sender, an expanded 32-bit CRC, and control character quoting supporting 8-bit clean ...
PuTTY user manual (copy from 2022) PuTTY (/ ˈ p ʌ t i /) [4] is a free and open-source terminal emulator, serial console and network file transfer application. It supports several network protocols, including SCP, SSH, Telnet, rlogin, and raw socket connection. It can also connect to a serial port. The name "PuTTY" has no official meaning. [5]
An ongoing transfer of file data over the data connection can be aborted using an interrupt message sent over the control connection. FTP needs two ports (one for sending and one for receiving) because it was originally designed to operate on top of Network Control Protocol (NCP), which was a simplex protocol that utilized two port addresses ...
Requested action not taken. File unavailable (e.g., file not found, no access). 551: Requested action aborted. Page type unknown. 552: Requested file action aborted. Exceeded storage allocation (for current directory or dataset). 553: Requested action not taken. File name not allowed. 600 Series: Replies regarding confidentiality and integrity: 631