-8      Specifies an 8-bit data path.  This causes an attempt to negotiate the TELNET BINARY option on both
        input and output.

-E      Stops any character from being recognized as an escape character.

-F      If Kerberos V5 authentication is being used, the -F option allows the local credentials to be
        forwarded to the remote system, including any credentials that have already been forwarded into the
        local environment.

-K      Specifies no automatic login to the remote system.

-L      Specifies an 8-bit data path on output.  This causes the BINARY option to be negotiated on output.

-S tos  Sets the IP type-of-service (TOS) option for the telnet connection to the value tos, which can be a
        numeric TOS value or, on systems that support it, a symbolic TOS name found in the /etc/iptos file.

-X atype
        Disables the atype type of authentication.

-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 name used is that of the current user as returned by
        getlogin(2) if it agrees with the current user ID, otherwise it is the name associated with the
        user ID.

-c      Disables the reading of the user's .telnetrc file.  (See the toggle skiprc command on this man
        page.)

-d      Sets the initial value of the debug toggle to TRUE

-e escape char
        Sets the initial telnet telnet escape character to escape char. If escape char is omitted, then
        there will be no escape character.

-f      If Kerberos V5 authentication is being used, the -f option allows the local credentials to be
        forwarded to the remote system.

-k realm
        If Kerberos authentication is being used, the -k option requests that telnet obtain tickets for the
        remote host in realm realm instead of the remote host's realm, as determined by krb_realmofhost(3).

-l user
        When connecting to the remote system, if the remote system understands the ENVIRON option, then
        user will be sent to the remote system as the value for the variable USER.  This option implies the
        -a option.  This option may also be used with the open command.

-n tracefile
        Opens tracefile for recording trace information.  See the set tracefile command below.

-r      Specifies a user interface similar to rlogin(1).  In this mode, the escape character is set to the
        tilde (~) character, unless modified by the -e option.

-x      Turns on encryption of the data stream if possible.  This option is not available outside of the
        United States and Canada.

-input        This is the same as the encrypt stop input command.

output        This is the same as the encrypt start output command.

-output       This is the same as the encrypt stop output command.