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TELNET(1)							     TELNET(1)

NAME
       telnet - user interface to the TELNET protocol

SYNOPSIS
       telnet  [-8]  [-E] [-F] [-K] [-L] [-S tos] [-X authtype] [-a] [-c] [-d]
       [-e escapechar] [-f] [-k realm] [-l  user]  [-n	tracefile]  [-r]  [-x]
       [host [port]]

DESCRIPTION
       The  telnet  command is used to communicate with another host using the
       TELNET protocol.	 If telnet is invoked without the  host	 argument,  it
       enters command mode, indicated by its prompt ( telnet>).	 In this mode,
       it accepts and executes the commands listed below.  If  it  is  invoked
       with arguments, it performs an open command with those arguments.

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

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

       -F     forward a forwardable copy  of  the  local  credentials  to  the
	      remote system.

       -K     Specify no automatic login to the remote system.

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

       -S tos Set the IP type-of-service (TOS) option for the  telnet  connec‐
	      tion to the value tos, which can be a numeric TOS value (in dec‐
	      imal, or a hex value preceded by 0x, or an octal value  preceded
	      by  a  leading 0) or, on systems that support it, a symbolic TOS
	      name found in the /etc/iptos file.

       -X atype
	      Disable the atype type of authentication.

       -a     Attempt automatic login.	This sends the user name via the  USER
	      variable	of the ENVIRON option, if supported by the remote sys‐
	      tem.  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     Disable the reading of the user's .telnetrc file.	 (See the tog‐
	      gle skiprc command on this man page.)

       -d     Set the initial value of the debug flag to TRUE

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

       -f     forward a copy of the local credentials to the remote system.

       -k realm
	      If Kerberos authentication is being used,	 request  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
	      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
	      Open  tracefile  for  recording  trace information.  See the set
	      tracefile command below.

       -r     Specify 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     Turn on encryption of the data  stream.	When  this  option  is
	      turned on, telnet will exit with an error if authentication can‐
	      not be negotiated or if encryption cannot be turned on.

       host   Indicates the name, alias, or Internet  address  of  the	remote
	      host.

       port   Indicates	 a  port  number  (address of an application).	If the
	      port is not specified, the default telnet port (23) is used.

       When in rlogin mode, ~ is the telnet escape character; a	 line  of  the
       form ~. disconnects from the remote host.  Similarly, the line ~^Z sus‐
       pends the telnet session.  The line ~^] escapes 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	 (nor‐
       mally)  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	flag  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 pro‐
       tocol 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 termi‐
       nal 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 com‐
       mand to uniquely identify it need be typed (this is also true for argu‐
       ments  to  the mode, set, toggle, unset, slc, environ, and display com‐
       mands).

       auth argument ...
	      The auth command manipulates the information  sent  through  the
	      TELNET  AUTHENTICATE  option.  Valid arguments for the auth com‐
	      mand are as follows:

	      disable type
		     Disables the specified type of authentication.  To obtain
		     a	list  of available types, use the auth disable ?  com‐
		     mand.

	      enable type
		     Enables the specified type of authentication.  To	obtain
		     a	list  of  available types, use the auth enable ?  com‐
		     mand.

	      status Lists the current status of the various types of  authen‐
		     tication.

       close  Close a TELNET session and return to command mode.

       display argument ...
	      Displays some or all of the set and toggle values (see below).

       encrypt argument ...
	      The encrypt command manipulates the information sent through the
	      TELNET ENCRYPT option.

       Note:  Because of export controls, the TELNET  ENCRYPT  option  is  not
       supported outside of the United States and Canada.

       Valid arguments for the encrypt command are as follows:

	      disable type [input|output]
		     Disables  the  specified type of encryption.  If you omit
		     the input and output, both input and output are disabled.
		     To obtain a list of available types, use the encrypt dis‐
		     able ?  command.

	      enable type]fP [input|output]
		     Enables the specified type of encryption.	 If  you  omit
		     input  and output, both input and output are enabled.  To
		     obtain a list of available types, use the encrypt	enable
		     ?	command.

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

	      -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.

	      start [input|output]
		     Attempts to start encryption.  If you omit input and out‐
		     put, both input and output are enabled.  To obtain a list
		     of available types, use the encrypt enable ?  command.

	      status Lists the current status of encryption.

	      stop [input|output]
		     Stops  encryption.	 If you omit input and output, encryp‐
		     tion is on both input and output.

	      type type
		     Sets the default type of encryption to be used with later
		     encrypt start or encrypt stop commands.

       environ arguments ...
	      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:

	      define variable value
		     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.

	      undefine variable
		     Remove variable from the list of environment variables.

	      export variable
		     Mark the variable variable to be exported to  the	remote
		     side.

	      unexport variable
		     Mark  the	variable  variable  to	not be exported unless
		     explicitly asked for by the remote side.

	      list   List the current set  of  environment  variables.	 Those
		     marked  with  a * will be sent automatically; other vari‐
		     ables will only be sent if explicitly requested.

	      ?	     Prints out help information for the environ command.

       logout Sends the TELNET LOGOUT option to the remote side.  This command
	      is  similar to a close command; however, if the remote side does
	      not support the LOGOUT option, nothing  happens.	 If,  however,
	      the  remote  side	 does  support the LOGOUT option, this command
	      should cause the remote side to close the TELNET connection.  If
	      the remote side also supports the concept of suspending a user's
	      session for later reattachment, the  logout  argument  indicates
	      that you should terminate the session immediately.

       mode type
	      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.

	      character
		     Disable the TELNET LINEMODE option,  or,  if  the	remote
		     side  does not understand the LINEMODE option, then enter
		     ``character at a time'' mode.

	      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.

	      isig (-isig)
		     Attempt to enable	(disable)  the	TRAPSIG	 mode  of  the
		     LINEMODE  option.	This requires that the LINEMODE option
		     be enabled.

	      edit (-edit)
		     Attempt to enable (disable) the EDIT mode of the LINEMODE
		     option.   This  requires  that  the  LINEMODE  option  be
		     enabled.

	      softtabs (-softtabs)
		     Attempt to enable (disable)  the  SOFT_TAB	 mode  of  the
		     LINEMODE  option.	This requires that the LINEMODE option
		     be enabled.

	      litecho (-litecho)
		     Attempt to enable (disable)  the  LIT_ECHO	 mode  of  the
		     LINEMODE  option.	This requires that the LINEMODE option
		     be enabled.

	      ?	     Prints out help information for the mode command.

       open host [-a] [[-l] user] [-port]
	      Open a connection to the named host.  If no port number is spec‐
	      ified,  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).	After establishing a  connection,  the
	      file  .telnetrc  in  the user's home directory is opened.	 Lines
	      beginning with a # are comment lines.  Blank lines are  ignored.
	      Lines  that begin without white space 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 succes‐
	      sive lines that begin with white space are assumed to be	telnet
	      commands and are processed as if they had been typed in manually
	      to the telnet command prompt.

	      -a     Attempt automatic login.  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.

	      [-l] user
		     may  be used to specify the user name to be passed to the
		     remote system via the ENVIRON option.

	      -port  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.

       quit   Close  any  open TELNET session and exit telnet.	An end of file
	      (in command mode) will also close a session and exit.

       send arguments
	      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):

	      abort  Sends the TELNET ABORT (Abort processes) sequence.

	      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.

	      ayt    Sends the TELNET AYT (Are You There) sequence,  to	 which
		     the remote system may or may not choose to respond.

	      brk    Sends  the	 TELNET	 BRK  (Break) sequence, which may have
		     significance to the remote system.

	      ec     Sends the TELNET EC  (Erase  Character)  sequence,	 which
		     should  cause the remote system to erase the last charac‐
		     ter entered.

	      el     Sends the TELNET EL (Erase Line) sequence,	 which	should
		     cause the remote system to erase the line currently being
		     entered.

	      eof    Sends the TELNET EOF (End Of File) sequence.

	      eor    Sends the TELNET EOR (End of Record) sequence.

	      escape Sends the current escape character (initially ``^''.

	      ga     Sends the TELNET GA (Go Ahead) sequence, which likely has
		     no significance to the remote system.

	      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.

	      ip     Sends  the	 TELNET IP (Interrupt Process) sequence, which
		     should cause the remote system  to	 abort	the  currently
		     running process.

	      nop    Sends the TELNET NOP (No OPeration) sequence.

	      susp   Sends the TELNET SUSP (SUSPend process) sequence.

	      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	4.2BSD
		     system  --	 if it doesn't work, a lower case ``r'' may be
		     echoed on the terminal).

	      do cmd

	      dont cmd

	      will cmd

	      wont cmd
		     Sends the TELNET DO cmd sequence.	Cmd can	 be  either  a
		     decimal  number between 0 and 255, or a symbolic name for
		     a specific TELNET command.	 Cmd can also be  either  help
		     or	 ?  to print out help information, including a list of
		     known symbolic names.

	      ?	     Prints out help information for the send command.

       set argument value

       unset argument value
	      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	 vari‐
	      ables  may  be interrogated with the display command.  The vari‐
	      ables 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.

	      ayt    If telnet is in localchars mode, or LINEMODE is  enabled,
		     and  the status character is typed, a TELNET AYT sequence
		     (see send ayt preceding) is sent to the remote host.  The
		     initial  value  for  the "Are You There" character is the
		     terminal's status character.

	      echo   This is the  value	 (initially  ``^E'')  which,  when  in
		     ``line  by line'' mode, toggles between doing local echo‐
		     ing of entered characters (for  normal  processing),  and
		     suppressing  echoing of entered characters (for entering,
		     say, a password).

	      eof    If telnet is operating  in	 LINEMODE  or  ``old  line  by
		     line'' mode, entering this character as the first charac‐
		     ter 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.

	      erase  If telnet is in 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.

	      escape This  is  the  telnet escape character (initially ``^['')
		     which causes entry into telnet command  mode  (when  con‐
		     nected to a remote system).

	      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.

	      forw1

	      forw2  If telnet is operating in LINEMODE, these are the charac‐
		     ters that, when typed, cause partial  lines  to  be  for‐
		     warded  to	 the remote system.  The initial value for the
		     forwarding characters are taken from the  terminal's  eol
		     and eol2 characters.

	      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.

	      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.

	      lnext  If telnet is operating  in	 LINEMODE  or  ``old  line  by
		     line''  mode, then this character is taken to be the ter‐
		     minal's lnext character.  The initial value for the lnext
		     character is taken to be the terminal's lnext character.

	      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.

	      reprint
		     If	 telnet	 is  operating	in  LINEMODE  or ``old line by
		     line'' mode, then this character is taken to be the  ter‐
		     minal's reprint character.	 The initial value for the re‐
		     print character is taken to  be  the  terminal's  reprint
		     character.

	      rlogin This  is the rlogin escape character.  If set, the normal
		     TELNET escape character is ignored unless it is  preceded
		     by this character at the beginning of a line.  This char‐
		     acter, at the beginning of	 a  line  followed  by	a  "."
		     closes  the connection; when followed by a ^Z it suspends
		     the telnet command.  The initial state is to disable  the
		     rlogin escape character.

	      start  If	  the	TELNET	TOGGLE-FLOW-CONTROL  option  has  been
		     enabled, then this character is taken to  be  the	termi‐
		     nal's  start  character.	The initial value for the kill
		     character is taken to be the terminal's start character.

	      stop   If	 the  TELNET  TOGGLE-FLOW-CONTROL  option   has	  been
		     enabled,  then  this  character is taken to be the termi‐
		     nal's stop character.  The initial	 value	for  the  kill
		     character is taken to be the terminal's stop character.

	      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.

	      tracefile
		     This  is  the file to which the output, caused by netdata
		     or option tracing being TRUE, will be written.  If it  is
		     set to ``-'', then tracing information will be written to
		     standard output (the default).

	      worderase
		     If telnet is operating  in	 LINEMODE  or  ``old  line  by
		     line''  mode, then this character is taken to be the ter‐
		     minal's worderase character.  The initial value  for  the
		     worderase	 character  is	taken  to  be  the  terminal's
		     worderase character.

	      ?	     Displays the legal set (unset) commands.

       slc state
	      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.

	      check  Verify the current settings for the current special char‐
		     acters.  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.

	      export Switch  to the local defaults for the special characters.
		     The local default characters are those of the local  ter‐
		     minal at the time when telnet was started.

	      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 estab‐
		     lished.

	      ?	     Prints out help information for the slc command.

       status Show the current status of telnet.  This includes the  peer  one
	      is connected to, as well as the current mode.

       toggle arguments ...
	      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 argu‐
	      ments are:

	      authdebug
		     Turns on debugging	 information  for  the	authentication
		     code.

	      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).

	      autodecrypt
		     When  the TELNET ENCRYPT option is negotiated, by default
		     the actual encryption (decryption)	 of  the  data	stream
		     does  not	start automatically.  The autoencrypt (autode‐
		     crypt) command  states  that  encryption  of  the	output
		     (input) stream should be enabled as soon as possible.

	      Note:   Because of export controls, the TELNET ENCRYPT option is
	      not supported outside the United States and Canada.

	      autologin
		     If the remote side	 supports  the	TELNET	AUTHENTICATION
		     option  telnet  attempts  to  use it to perform automatic
		     authentication.  If the AUTHENTICATION option is not sup‐
		     ported,  the user's login name are propagated through the
		     TELNET ENVIRON option.  This command is the same as spec‐
		     ifying the -a option on the open command.

	      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.

	      binary Enable  or disable the TELNET BINARY option on both input
		     and output.

	      inbinary
		     Enable or disable the TELNET BINARY option on input.

	      outbinary
		     Enable or disable the TELNET BINARY option on output.

	      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.

	      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 .

	      debug  Toggles socket level debugging (useful only to the	 super
		     user).  The initial value for this toggle is FALSE .

	      encdebug
		     Turns on debugging information for the encryption code.

	      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 tog‐
		     gle 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).

	      netdata
		     Toggles  the  display of all network data (in hexadecimal
		     format).  The initial value for this toggle is FALSE.

	      options
		     Toggles the display of some internal telnet protocol pro‐
		     cessing  (having to do with TELNET options).  The initial
		     value for this flag is FALSE .

	      prettydump
		     When the  netdata	flag  is  enabled,  if	prettydump  is
		     enabled  the output from the netdata command will be for‐
		     matted 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.

	      skiprc When the skiprc flag is TRUE, TELNET skips the reading of
		     the .telnetrc file in the user's home directory when con‐
		     nections  are opened.  The initial value for this flag is
		     FALSE.

	      termdata
		     Toggles the display of all terminal data (in  hexadecimal
		     format).  The initial value for this flag is FALSE.

	      verbose_encrypt
		     When  the verbose_encrypt flag is TRUE, TELNET prints out
		     a message each time encryption is	enabled	 or  disabled.
		     The  initial  value  for  this  toggle  is	 FALSE.	 Note:
		     Because of export controls, data encryption is  not  sup‐
		     ported outside of the United States and Canada.

	      ?	     Displays the legal toggle commands.

       z      Suspend  telnet.	 This command only works when the user's shell
	      is csh(1).

       ! [command]
	      Execute a single command in a subshell on the local system.   If
	      command is omitted, then an interactive subshell is invoked.

       ? command
	      Get  help.  With no arguments, prints a help summary.  If a com‐
	      mand is specified, will print the help information for just that
	      command.

ENVIRONMENT
       Telnet  uses  at	 least	the HOME, SHELL, DISPLAY, and TERM environment
       variables.  Other environment variables may be propagated to the	 other
       side via the TELNET ENVIRON option.

FILES
       ~/.telnetrc  user-customized telnet startup values
       ~/.k5login   (on remote host) - file containing Kerberos princi‐
		    pals that are allowed access.

HISTORY
       The Telnet command appeared in 4.2BSD.

NOTES
       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.

								     TELNET(1)
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