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'''`telnet(1)`''' is a text-based communication protocol and virtual terminal. Historically, `telnet(1)` was used in a similar manner to modern [[Encryption/SSH|SSH]]. |
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| ---- | Many Linux and BSD distributions meant for desktop use will come with `telnet(1)` installed. Otherwise, it is usually packaged either as `telnet` or bundled into a larger `inetutils` package. |
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== Configuration == |
''Do not install the telnet server.'' |
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| === Open Street Map === {{{ telnet mapscii.me }}} See [[https://github.com/rastapasta/mapscii|here]] for details. === Star Wars === {{{ telnet towel.blinkenlights.nl }}} |
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| To use `telnet(1)` for SMTP, try running `telnet smtp.example.com 25`. This opens a REPL, which is annotated here with arrows denoting user input (`->`), server response (`<-`), and local client messages (`-`). | To use `telnet(1)` for [[Email/SMTP|SMTP]], try running `telnet smtp.example.com 25`. This opens a REPL, which is annotated here with arrows denoting user input (`->`), server response (`<-`), and local client messages (`-`). |
Telnet
telnet(1) is a text-based communication protocol and virtual terminal.
Historically, telnet(1) was used in a similar manner to modern SSH.
Contents
Installation
Many Linux and BSD distributions meant for desktop use will come with telnet(1) installed. Otherwise, it is usually packaged either as telnet or bundled into a larger inetutils package.
Do not install the telnet server.
Usage
Open Street Map
telnet mapscii.me
See here for details.
Star Wars
telnet towel.blinkenlights.nl
SMTP
To use telnet(1) for SMTP, try running telnet smtp.example.com 25. This opens a REPL, which is annotated here with arrows denoting user input (->), server response (<-), and local client messages (-).
- Trying smtp.example.com... - Connected smtp.example.com. - Escape character is '^]'. <- 220 smtphostname ESMTP Postfix -> ehlo smtphostname <- 250-smtphostname <- 250-PIPELINING <- 250-SIZE 10240000 <- 250-VRFY <- 250-ETRN <- 250-ENHANCEDSTATUSCODES <- 250-8BITMIME <- 250-DSN <- 250-SMTPUTF8 <- 250-CHUNKING -> mail from: [email protected] <- 250 2.1.0 Ok -> rcpt to: [email protected] <- 250 2.1.5 Ok -> data <- 354 End data with <CR><LF>.<CR><LF> -> This is the body of an email. -> Exit this REPL by submitting a line that only contains a period. -> . <- 250 2.0.0 Ok: queued as 0123456789ab -> quit <- 221 2.0.0 Bye - Connection closed by foreign host.