telnet



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.
                     Variables  defined  by this command are not 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; those  marked
                     with  a  +  will  be sent if the other end requests their
                     values, and other variables will not be sent.

              ?      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
                     echoing  of  entered  characters (for normal processing),
                     and suppressing echoing of entered characters (for enter-
                     ing, 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
                     reprint 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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