-4 Force IPv4 address resolution.
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-6 Force IPv6 address resolution.
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-8 Request 8-bit operation. This causes an attempt to negotiate the TELNET BINARY option for both
input and output. By default telnet is not 8-bit clean.
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-E Disables the escape character functionality; that is, sets the escape character to ``no
character''.
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-K Specifies no automatic login to the remote system.
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-L Specifies an 8-bit data path on output. This causes the TELNET BINARY option to be negotiated on
just output.
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-X atype
Disables the atype type of authentication.
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-a Attempt automatic login. Currently, this sends the user name via the USER variable of the ENVIRON
option if supported by the remote system. The username is retrieved via getlogin(3).
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-b address
Use bind(2) on the local socket to bind it to a specific local address.
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-d Sets the initial value of the debug toggle to TRUE.
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-r Emulate rlogin(1). In this mode, the default escape character is a tilde. Also, the interpretation
of the escape character is changed: an escape character followed by a dot causes telnet to
disconnect from the remote host. A ^Z instead of a dot suspends telnet, and a ^] (the default
telnet escape character) generates a normal telnet prompt. These codes are accepted only at the
beginning of a line.
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-S tos Sets the IP type-of-service (TOS) option for the telnet connection to the value tos.
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-e escapechar
Sets the escape character to escapechar. If no character is supplied, no escape character will be
used. Entering the escape character while connected causes telnet to drop to command mode.
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-l user
Specify user as the user to log in as on the remote system. This is accomplished by sending the
specified name as the USER environment variable, so it requires that the remote system support the
TELNET ENVIRON option. This option implies the -a option, and may also be used with the open
command.
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-n tracefile
Opens tracefile for recording trace information. See the set tracefile command below.
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-z option
Set SSL (Secure Socket Layer) parameters. The default is to negotiate via telnet protocol if SSL is
available at server side and then to switch it on. In this mode you can connect to both
conventional and SSL enhanced telnetd's. If the connection is made to localhost and -z secure is
not set, then SSL is not enabled.
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verify=int Set the SSL verify flags (SSL_VERIFY_* in ssl/ssl.h ).
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cert=cert_file
Use the certificate(s) in cert_file.
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key=key_file
Use the key(s) in key_file.
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cipher=ciph_list
Set the preferred ciphers to ciph_list. (See ssl/ssl.h ).
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