"SfR Fresh" - the SfR Freeware/Shareware Archive 
"SfR Fresh" - the SfR Freeware/Shareware Archive
Options: Tw Fl Tp Fl 8 Use an eight bit data path. This will cause an attempt to negotiate the BINARY option on both input and output. Tp Fl E The -E option stops any character from being recognized as an escape character. Tp Fl K Do not attempt to do automatic login to the remote system. Tp Fl L Use an eight bit data path on output. This causes the BINARY option to be negotiated on output. Tp Cx Fl X Cx atype Cx Disable the atype type of authentication. Tp Fl 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. Tp Fl c The -c flag disables the reading of the users .telnetrc. (See the toggle skiprc command below.) Tp Fl d Sets the initial value of the debug toggle to TRUE Tp Cx Fl e Cx escape char Cx Sets the initial telnet telnet escape character to escape char. If escape char is ommitted, then there will be no escape character. Tp Cx Fl k Cx realm Cx 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_realmofhost3. Tp Cx Fl l Cx user Cx 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. Tp Cx Fl n Cx tracefile Cx Opens tracefile for recording trace information. See the set tracefile command below. Tp Fl r Use a user interface similar to rlogin(1). In this mode, the escape character is set to the tilde (``~'') character, unless modified by the -e flag. Tp Fl x Turn on encryption of the data stream, if possible. Tp Ar host Indicates the official name, an alias, or the Internet address of a remote host. Tp Ar port Indicates a port number (address of an application) or name. If a number is not specified, the default telnet port is used. Port names are mapped to port numbers via the /etc/services file. Normally when a port number is specified, telnet will not send out any initial TELNET option negotiation. If the port number/name is preceded by a minus sign, then the initial TELNET option negotiation will be sent. Tp
When in rlogin mode, a line of the form ``~.'' disconnects from the remote host, where ``~'' is the telnet escape character. Similarly, the line ``~^Z'' will suspend the telnet session. The line ``~^]'' will escape to the normal telnet escape prompt.
Once a connection has been opened, telnet will attempt to enable the TELNET LINEMODE option. If this fails, then telnet will revert to one of two input modes: either character at a time or old line by line depending on what the remote system supports.
When LINEMODE is enabled, character processing is done on the local system, under the control of the remote system. When input editing or character echoing is to be disabled, the remote system will relay that information. The remote system will also relay changes to any special characters that happen on the remote system, so that they can take effect on the local system.
In character at a time mode, most text typed is immediately sent to the remote host for processing.
In old line by line mode, all text is echoed locally, and (normally) only completed lines are sent to the remote host. The local echo character (initially ^E) may be used to turn off and on the local echo (this would mostly be used to enter passwords without the password being echoed).
If the LINEMODE option is enabled, or if the localchars toggle is TRUE (the default for old line by line; see below), the user's quit intr and flush characters are trapped locally, and sent as TELNET protocol sequences to the remote side. If LINEMODE has ever been enabled, then the user's susp and eof are also sent as TELNET protocol sequences, and quit is sent as a TELNET ABORT instead of BREAK There are options (see toggle autoflush and toggle autosynch below) which cause this action to flush subsequent output to the terminal (until the remote host acknowledges the TELNET sequence) and flush previous terminal input (in the case of quit and intr )
While connected to a remote host, telnet command mode may be entered by typing the telnet escape character (initially ^ ). When in command mode, the normal terminal editing conventions are available.
The following telnet commands are available. Only enough of each command to uniquely identify it need be typed (this is also true for most of the arguments to the commands).
Tw Ic
Tp Cx Ic auth
Cx
arguments...
Cx The
auth
command is used to manipulate the
the information that my be sent through the
TELNET AUTHENTICATE
option.
Valid arguments for the auth command are:
Tw Fl
Tp Cx Ic disable
Cx
type
Cx Disable the specified
type
of authentication.
A list of available types can be gotten by
doing an
auth
disable
?
command.
Tp Cx Ic enable
Cx
type
Cx Enable the specified
type
of authentication.
A list of available types can be gotten by
doing an
auth
enable
?
command.
Tp Ic status
List the current status of the various
types of authentication.
Tp
Tp Ic close
Close a
TELNET
session and return to command mode.
Tp Cx Ic display
Cx
argument ...
Cx Displays all, or some, of the
set
and
toggle
values (see below).
Tp Cx Ic encrypt
Cx
arguments...
Cx The
encrypt
command is used to manipulate the
the information that my be sent through the
TELNET ENCRYPT
option.
Valid arguments for the encrypt command are:
Tw Fl
Tp Cx Ic disable
Cx
type
[input|output]
Cx Disable the specified
type
of encryption.
If the
[input]
or
[output]
is not specified, both input and output will be disabled.
A list of available types can be gotten by
doing an
encrypt
disable
?
command.
Tp Cx Ic enable
Cx
type
[input|output]
Cx Enable the specified
type
of encryption.
If
[input]
or
[output]
is not specified, both input and output will be enabled.
A list of available types can be gotten by
doing an
encrypt
enable
?
command.
Tp Cx Ic type
Cx
type
Cx Set the default type of encryption to be used with later
encrypt start
or
encrypt stop
commands.
Tp Cx Ic start
[input|output]
Cx Attempt to start encryption.
If
[input]
or
[output]
is not specified, encryption of both input and output will be attempted.
The
encrypt type
command must have been used to set the encryption type.
Tp Cx Ic stop
[input|output]
Cx Stop encryption.
If
[input]
or
[output]
is not specified, encryption will be stopped on both input and output.
Tp Ic input
This is the same as the
encrypt start input
command.
Tp Ic -input
This is the same as the
encrypt stop input
command.
Tp Ic output
This is the same as the
encrypt start output
command.
Tp Ic -output
This is the same as the
encrypt stop output
command.
Tp Ic status
List the current status of encryption.
Tp
Tp Cx Ic environ
Cx
arguments...
Cx The
environ
command is used to manipulate the
the variables that my be sent through the
TELNET ENVIRON
option.
The initial set of variables is taken from the users
environment, with only the
DISPLAY
and
PRINTER
variables being exported by default.
The
USER
variable is also exported if the
-a
or
-l
options are used.
Valid arguments for the environ command are:
Tw Fl
Tp Cx Ic define
Cx
variable value
Cx Define the variable
variable
to have a value of
value.
Any variables defined by this command are automatically exported.
The
value
may be enclosed in single or double quotes so
that tabs and spaces may be included.
Tp Cx Ic undefine
Cx
variable
Cx Remove
variable
from the list of environment variables.
Tp Cx Ic export
Cx
variable
Cx Mark the variable
variable
to be exported to the remote side.
Tp Cx Ic unexport
Cx
variable
Cx Mark the variable
variable
to not be exported unless
explicitly asked for by the remote side.
Tp Ic list
List the current set of environment variables.
Those marked with a * will be sent automatically,
other variables will only be sent if explicitly requested.
Tp Ic ?
Prints out help information for the
environ
command.
Tp
Tp Ic logout
Send the
TELNET LOGOUT
option to the remote side.
This is similar to doing a
close
command, however
if the remote side does not support the
LOGOUT
option, then nothing will happen.
If, however, the remote side does support the
LOGOUT
option, then this command should cause the remote side
to close the
TELNET
connection.
In addition, if the remote side supports the concept of suspending
a users session for later re-attachement, the
LOGOUT
option indicates that the session should be terminated immediately.
Tp Cx Ic mode
Cx
type
Cx Type
is one of several options, depending on the state of the
TELNET
session.
The remote host is asked for permission to go into the requested mode.
If the remote host is capable of entering that mode, the requested
mode will be entered.
Tw Ar
Tp Ic character
Disable the
TELNET LINEMODE
option, or, if the remote side does not understand the
LINEMODE
option, then enter character at a time mode.
Tp Ic line
Enable the
TELNET LINEMODE
option, or, if the remote side does not understand the
LINEMODE
option, then attempt to enter old-line-by-line mode.
Tp Cx Ic isig
Cx
(-isig
)
Cx Attempt to enable (disable) the
TRAPSIG
mode of the
LINEMODE
option.
This requires that the
LINEMODE
option be enabled.
Tp Cx Ic edit
Cx
(-edit
)
Cx Attempt to enable (disable) the
EDIT
mode of the
LINEMODE
option.
This requires that the
LINEMODE
option be enabled.
Tp Cx Ic softtabs
Cx
(-softtabs
)
Cx Attempt to enable (disable) the
SOFT_TAB
mode of the
LINEMODE
option.
This requires that the
LINEMODE
option be enabled.
Tp Cx Ic litecho
Cx
(-litecho
)
Cx Attempt to enable (disable) the
LIT_ECHO
mode of the
LINEMODE
option.
This requires that the
LINEMODE
option be enabled.
Tp Ic ?
Prints out help information for the
mode
command.
Tp
Tp Cx Ic open
Cx
host
Cx
Cx [
[-l
]
Cx
user
Cx ]
Cx [
[-
]
Cx
port
Cx ]
Cx Open a connection to the named host.
If no port number
is specified,
telnet
will attempt to contact a
TELNET
server at the default port.
The host specification may be either a host name (see
hosts(5))
or an Internet address specified in the dot notation (see
inet(3)).
The
[-l
]
option may be used to specify the user name
to be passed to the remote system via the
ENVIRON
option.
When connecting to a non-standard port,
telnet
omits any automatic initiation of
TELNET
options. When the port number is preceded by a minus sign,
the initial option negotiation is done.
After establishing a connection,
if the
skiprc
variable is not enabled
(see the
toggle
skiprc
command below),
the file
.telnetrc
in the
users home directory is opened. Lines beginning with a # are
comment lines. Blank lines are ignored. Lines that begin
without whitespace are the start of a machine entry. The
first thing on the line is the name of the machine that is
being connected to. The rest of the line, and successive
lines that begin with whitespace are assumed to be
telnet
commands and are processed as if they had been typed
in manually to the
telnet
command prompt.
The special machine name
DEFAULT
is used to specify commands that should be executed for
all machines.
There may be more than one entry for a machine; all matches
will the specified machine name will be executed.
Tp Ic quit
Close any open
TELNET
session and exit
telnet
An end of file (in command mode) will also close a session and exit.
Tp Cx Ic send
Cx
arguments
Cx Sends one or more special character sequences to the remote host.
The following are the arguments which may be specified
(more than one argument may be specified at a time):
Tw Ds Tp Ic abort Sends the TELNET ABORT (ABORT processes) sequence. Tp Ic ao Sends the TELNET AO (Abort Output) sequence, which should cause the remote system to flush all output from the remote system to the user's terminal. Tp Ic ayt Sends the TELNET AYT (Are You There) sequence, to which the remote system may or may not choose to respond. Tp Ic brk Sends the TELNET BRK (Break) sequence, which may have significance to the remote system. Tp Ic ec Sends the TELNET EC (Erase Character) sequence, which should cause the remote system to erase the last character entered. Tp Ic el Sends the TELNET EL (Erase Line) sequence, which should cause the remote system to erase the line currently being entered. Tp Ic eof Sends the TELNET EOF (End Of File) sequence. Tp Ic eor Sends the TELNET EOR (End of Record) sequence. Tp Ic escape Sends the current telnet escape character (initially ^). Tp Ic ga Sends the TELNET GA (Go Ahead) sequence, which likely has no significance to the remote system. Tp Ic getstatus If the remote side supports the TELNET STATUS command, getstatus will send the subnegotiation to request that the server send its current option status. Tp Ic ip Sends the TELNET IP (Interrupt Process) sequence, which should cause the remote system to abort the currently running process. Tp Ic nop Sends the TELNET NOP (No OPeration) sequence. Tp Ic susp Sends the TELNET SUSP (SUSPend process) sequence. Tp Ic synch Sends the TELNET SYNCH sequence. This sequence causes the remote system to discard all previously typed (but not yet read) input. This sequence is sent as TCP urgent data (and may not work if the remote system is a 4.2 BSD system -- if it doesn't work, a lower case r may be echoed on the terminal). Tp Ic ? Prints out help information for the send command. Tp Tp Cx Ic set Cx argument value Cx Tp Cx Ic unset Cx argument value Cx The set command will set any one of a number of telnet variables to a specific value or to TRUE. The special value off turns off the function associated with the variable, this is equivalent to using the unset command. The unset command will disable or set to FALSE any of the specified functions. The values of variables may be interrogated with the display command. The variables which may be set or unset, but not toggled, are listed here. In addition, any of the variables for the toggle command may be explicitly set or unset using the set and unset commands. Tw Fl Tp Ic ayt If telnet is in localchars mode, or LINEMODE is enabled, and the status character is typed, a TELNET AYT sequence (see send ayt above) is sent to the remote host. The initial value for the ayt character is taken to be the terminal's status character. Tp Ic echo This is the value (initially ^E) which, when in line by line mode, toggles between doing local echoing of entered characters (for normal processing), and suppressing echoing of entered characters (for entering, say, a password). Tp Ic eof If telnet is operating in LINEMODE or old line by line mode, entering this character as the first character on a line will cause this character to be sent to the remote system. The initial value of the eof character is taken to be the terminal's eof character. Tp Ic erase If telnet is in localchars mode (see toggle localchars below), and if telnet is operating in character at a time mode, then when this character is typed, a TELNET EC sequence (see send ec above) is sent to the remote system. The initial value for the erase character is taken to be the terminal's erase character. Tp Ic escape This is the telnet escape character (initially ^[) which causes entry into telnet command mode (when connected to a remote system). Tp Ic flushoutput If telnet is in localchars mode (see toggle localchars below) and the flushoutput character is typed, a TELNET AO sequence (see send ao above) is sent to the remote host. The initial value for the flush character is taken to be the terminal's flush character. Tp Ic forw1 Tp Ic forw2 If telnet is operating in LINEMODE, these are the characters that, when typed, cause partial lines to be forwarded to the remote system. The initial value for the forw1 and forw2 characters are taken from the terminal's eol and eol2 characters. Tp Ic interrupt If telnet is in localchars mode (see toggle localchars below) and the interrupt character is typed, a TELNET IP sequence (see send ip above) is sent to the remote host. The initial value for the interrupt character is taken to be the terminal's intr character. Tp Ic kill If telnet is in localchars mode (see toggle localchars below), and if telnet is operating in character at a time mode, then when this character is typed, a TELNET EL sequence (see send el above) is sent to the remote system. The initial value for the kill character is taken to be the terminal's kill character. Tp Ic lnext If telnet is operating in LINEMODE or old line by line mode, then this character is taken to be the terminal's lnext character. The initial value for the lnext character is taken to be the terminal's lnext character. Tp Ic quit If telnet is in localchars mode (see toggle localchars below) and the quit character is typed, a TELNET BRK sequence (see send brk above) is sent to the remote host. The initial value for the quit character is taken to be the terminal's quit character. Tp Ic reprint If telnet is operating in LINEMODE or old line by line mode, then this character is taken to be the terminal's reprint character. The initial value for the reprint character is taken to be the terminal's reprint character. Tp Ic rlogin This is the rlogin escape character. If set, the normal telnet escape character will be ignored unless it is preceded by this character at the beginning of a line. This character, at the beginning of a line, followed by a ``.'' will close the connection; when followed by a ``^Z'' it will suspend the telnet command. The initial state is to have the rlogin escape character disabled. Tp Ic start If the TELNET TOGGLE-FLOW-CONTROL option has been enabled, then this character is taken to be the terminal's start character. The initial value for the kill character is taken to be the terminal's start character. Tp Ic stop If the TELNET TOGGLE-FLOW-CONTROL option has been enabled, then this character is taken to be the terminal's stop character. The initial value for the kill character is taken to be the terminal's stop character. Tp Ic susp If telnet is in localchars mode, or LINEMODE is enabled, and the suspend character is typed, a TELNET SUSP sequence (see send susp above) is sent to the remote host. The initial value for the suspend character is taken to be the terminal's suspend character. Tp Ic tracefile This is the file to which the output, caused by netdata, termdata, or option tracing being TRUE, will be written. If it is set to ``- '' then tracing information will be written to standard output (the default). Tp Ic worderase If telnet is operating in LINEMODE or old line by line mode, then this character is taken to be the terminal's worderase character. The initial value for the worderase character is taken to be the terminal's worderase character. Tp Ic ? Displays the legal set (unset ) commands. Tp Tp Cx Ic slc Cx state Cx The slc command (Set Local Characters) is used to set or change the state of the the special characters when the TELNET LINEMODE option has been enabled. Special characters are characters that get mapped to TELNET commands sequences (like ip or quit or line editing characters (like erase and kill ) By default, the local special characters are exported. Tw Fl Tp Ic export Switch to the local defaults for the special characters. The local default characters are those of the local terminal at the time when telnet was started. Tp Ic import Switch to the remote defaults for the special characters. The remote default characters are those of the remote system at the time when the TELNET connection was established. Tp Ic check Verify the current settings for the current special characters. The remote side is requested to send all the current special character settings, and if there are any discrepancies with the local side, the local side will switch to the remote value. Tp Ic ? Prints out help information for the slc command. Tp Tp Ic status Show the current status of telnet This includes the peer one is connected to, as well as the current mode. Tp Cx Ic toggle Cx arguments ... Cx Toggle (between TRUE and FALSE) various flags that control how telnet responds to events. These flags may be set explicitly to TRUE or FALSE using the set and unset commands listed above. More than one argument may be specified. The state of these flags may be interrogated with the display command. Valid arguments are: Tw Ar Tp Ic authdebug Turn on debugging information for the authentication code. Tp Ic autoflush If autoflush and localchars are both TRUE, then when the ao or quit characters are recognized (and transformed into TELNET sequences; see set above for details), telnet refuses to display any data on the user's terminal until the remote system acknowledges (via a TELNET TIMING MARK option) that it has processed those TELNET sequences. The initial value for this toggle is TRUE if the terminal user had not done an "stty noflsh", otherwise FALSE (see stty(1)). Tp Ic autoencrypt Tp Ic autodecrypt When the TELNET ENCRYPTION option is negotiated, by default the actual encryption (decryption) of the data stream does not automatically start. The autoencrypt (autodecrypt) command states that encryption of the output (input) stream should be enabled as soon as possible. Tp Ic autologin If the TELNET AUTHENTICATION option is supported by the remote side, then telnet will attempt to use it to perform automatic authentication. If the AUTHENTICATION option is not supported, then the users login name will be propagated via the TELNET ENVIRON option. This command is the same as specifying -a option on the open command. Tp Ic autosynch If autosynch and localchars are both TRUE, then when either the intr or quit characters is typed (see set above for descriptions of the intr and quit characters), the resulting TELNET sequence sent is followed by the TELNET SYNCH sequence. This procedure should cause the remote system to begin throwing away all previously typed input until both of the TELNET sequences have been read and acted upon. The initial value of this toggle is FALSE. Tp Ic binary Enable or disable the TELNET BINARY option on both input and output. Tp Ic inbinary Enable or disable the TELNET BINARY option on input. Tp Ic outbinary Enable or disable the TELNET BINARY option on output. Tp Ic crlf If this is TRUE, then carriage returns will be sent as <CR><LF>. If this is FALSE, then carriage returns will be send as <CR><NUL>. The initial value for this toggle is FALSE. Tp Ic crmod Toggle carriage return mode. When this mode is enabled, most carriage return characters received from the remote host will be mapped into a carriage return followed by a line feed. This mode does not affect those characters typed by the user, only those received from the remote host. This mode is not very useful unless the remote host only sends carriage return, but never line feed. The initial value for this toggle is FALSE. Tp Ic debug Toggles socket level debugging (useful only to the super user ) The initial value for this toggle is FALSE. Tp Ic encdebug Turn on debugging information for the encryption code. Tp Ic localchars If this is TRUE, then the flush interrupt quit erase and kill characters (see set above) are recognized locally, and transformed into (hopefully) appropriate TELNET control sequences (respectively ao ip brk ec and el see send above). The initial value for this toggle is TRUE in old line by line mode, and FALSE in character at a time mode. When the LINEMODE option is enabled, the value of localchars is ignored, and assumed to always be TRUE. If LINEMODE has ever been enabled, then quit is sent as abort and eof and suspend are sent as eof and susp see send above). Tp Ic netdata Toggles the display of all network data (in hexadecimal format). The initial value for this toggle is FALSE. Tp Ic options Toggles the display of some internal telnet protocol processing (having to do with TELNET options). The initial value for this toggle is FALSE. Tp Ic prettydump When the netdata or termdata toggle is enabled, if prettydump is enabled the output from the netdata and termdata command will be formated in a more user readable format. Spaces are put between each character in the output, and the beginning of any TELNET escape sequence is preceded by a '*' to aid in locating them. Tp Ic skiprc When the skiprc toggle is TRUE, then telnet will skip the reading of the .telnetrc file in the users home directory when connections are opened. The initial value for this toggle is FALSE. Tp Ic termdata Toggles the display of all terminal data (in hexadecimal format). The initial value for this toggle is FALSE. Tp Ic verbose_encrypt When the verbose_encrypt toggle is TRUE, then telnet will print out a message each time encryption is enabled or disabled. The initial value for this toggle is FALSE. Tp Ic ? Displays the legal toggle commands. Tp Tp Ic z Suspend telnet This command only works when the user is using the csh(1). Tp Cx Ic ! Cx [command ] Cx Execute a single command in a subshell on the local system. If command is omitted, then an interactive subshell is invoked. Tp Cx Ic ? Cx [command ] Cx Get help. With no arguments, telnet prints a help summary. If a command is specified, telnet will print the help information for just that command.
On some remote systems, echo has to be turned off manually when in old line by line mode.
In old line by line mode or LINEMODE the terminal's eof character is only recognized (and sent to the remote system) when it is the first character on a line.