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1 perry 1 ----
2 __NAME__
3
4
3 StuartYeates 5 telnet - user interface to the TELNET protocol
6
7
1 perry 8 __SYNOPSIS__
9
10
11 telnet [[-468ELadr] [[-S tos] [[-e escapechar] [[-l user] [[-n
3 StuartYeates 12 tracefile] [[ host [[port] ]
13
14
1 perry 15 __DESCRIPTION__
16
17
18 The telnet command is used for interactive communication
19 with another host using the TELNET protocol.
20 It begins in command mode, where it prints a telnet prompt
21 (
22
23
24 Options:
25 -4 Force [IPv4] address resolution.
26
27
28 -6Force [IPv6] address resolution.-8Request 8-bit operation. This causes an attempt tonegotiate the TELNET BINARY option for both input and output. By default telnet is not 8-bit clean.
29
30
31 -E
32 Disables the escape character functionality; that is, sets
33 the escape character to ``no character''.
34
35
36 -L
37 Specifies an 8-bit data path on output. This causes the
38 TELNET BINARY option to be negotiated on just
39 output.
40
41
42 -a
43 Attempt automatic login. Currently, this sends the user name
44 via the USER variable of the ENVIRON
45 option if supported by the remote system. The username is
46 retrieved via getlogin(3).
47
48
49 -d
50 Sets the initial value of the debug toggle to
51 TRUE.
52
53
54 -r
55 Emulate rlogin(1). In this mode, the default escape
56 character is a tilde. Also, the interpretation of the escape
57 character is changed: an escape character fol- lowed by a
58 dot causes telnet to disconnect from the remote host. A ^Z
59 instead of a dot suspends telnet, and a ^] (the default
60 telnet escape character) gener- ates a normal telnet prompt.
61 These codes are accepted only at the beginning of a
62 line.
63
64
65 -S tos
66 Sets the [IP] type-of-service (TOS) option for the tel- net
67 connection to the value tos.
68
69
70 -e escapechar
71 Sets the escape character to escapechar. If no char- acter
72 is supplied, no escape character will be used. Entering the
73 escape character while connected causes telnet to drop to
74 command mode.
75
76
77 -l user
78 Specify user as the user to log in as on the remote system.
79 This is accomplished by sending the specified name as the
80 USER environment variable, so it requires that the
81 remote system support the TELNET ENVIRON option.
82 This option implies the -a option, and may also be used with
83 the open command.
84
85
86 -n tracefile
87 Opens tracefile for recording trace information. See the set
88 tracefile command below.
89
90
91 host
92 Specifies a host to contact over the network.
93
94
95 port
96 Specifies a port number or service name to contact. If not
97 specified, the telnet port (23) is used.
98
99
100 Protocol:
101
102
103 Once a connection has been opened, telnet will attempt to
104 enable the TELNET LINEMODE option. If this fails,
105 then telnet will revert to one of two input modes: either
106 ``char- acter at a time'' or ``old line by line'' depending
107 on what the remote system supports.
108
109
110 When LINEMODE is enabled, character processing is
111 done on the local system, under the control of the remote
112 system. When input editing or character echoing is to be
113 disabled, the remote system will relay that information. The
114 remote system will also relay changes to any special
115 characters that happen on the remote system, so that they
116 can take effect on the local system.
117
118
119 In ``character at a time'' mode, most text typed is immedi-
120 ately sent to the remote host for processing.
121
122
123 In ``old line by line'' mode, all text is echoed locally,
124 and (normally) only completed lines are sent to the remote
125 host. The ``local echo character'' (initially ``^E'') may be
126 used to turn off and on the local echo (this would mostly be
127 used to enter passwords without the password being
128 echoed).
129
130
131 If the LINEMODE option is enabled, or if the
132 localchars tog- gle is TRUE (the default for ``old
133 line by line``; see below), the user's quit, intr, and flush
134 characters are trapped locally, and sent as
135 TELNET protocol sequences to the remote side.
136 If LINEMODE has ever been enabled, then the user's
137 susp and eof are also sent as TELNET protocol
138 sequences, and quit is sent as a TELNET ABORT
139 instead of BREAK There are options (see toggle
140 autoflush and toggle autosynch below) which cause this
141 action to flush subsequent output to the terminal (until the
142 remote host acknowledges the TELNET sequence)
143 and flush previous terminal input (in the case of quit and
144 intr).
145
146
147 Commands:
148
149
150 The following telnet commands are available. Unique prefixes
151 are understood as abbreviations.
152
153
154 auth argument ...
155 The auth command controls the TELNET AUTHENTICATE
156 protocol option. If telnet was compiled without
157 authentication, the auth command will not be sup- ported.
158 Valid arguments are as follows:
159
160
161 disable type
162 Disable the specified type of authen- tication. To obtain a
163 list of avail- able types, use the auth disable ?
164 command.
165
166
167 enable type
168 Enable the specified type of authen- tication. To obtain a
169 list of avail- able types, use the auth enable ?
170 command.
171
172
173 status
174 List the current status of the vari- ous types of
175 authentication.
176
177
178 Note that the current version of telnet does not support
179 authentication.
180
181
182 close
183 Close the connection to the remote host, if any, and return
184 to command mode.
185
186
187 display argument ...
188 Display all, or some, of the set and toggle values (see
189 below).
190
191
192 encrypt argument ...
193 The encrypt command controls the TELNET ENCRYPT
194 protocol option. If telnet was compiled without encryption,
195 the encrypt command will not be sup- ported.
196
197
198 Valid arguments are as follows:
199
200
201 disable type [[input|output]
202 Disable the specified type of encryp- tion. If you do not
203 specify input or output, encryption of both is dis- abled.
204 To obtain a list of available types, use ``encrypt disable
205 ?''.
206
207
208 enable type [[input|output]
209 Enable the specified type of encryp- tion. If you do not
210 specify input or output, encryption of both is enabled. To
211 obtain a list of avail- able types, use ``encrypt enable
212 ?''.
213
214
215 input
216 This is the same as ``encrypt start input''.
217
218
219 -input
220 This is the same as ``encrypt stop input''.
221
222
223 output
224 This is the same as ``encrypt start output''.
225
226
227 -output
228 This is the same as ``encrypt stop output''.
229
230
231 start [[input|output]
232 Attempt to begin encrypting. If you do not specify input or
233 output, encryption of both input and output is
234 started.
235
236
237 status
238 Display the current status of the encryption
239 module.
240
241
242 stop [[input|output]
243 Stop encrypting. If you do not spec- ify input or output,
244 encryption of both is stopped.
245
246
247 type type
248 Sets the default type of encryption to be used with later
249 ``encrypt start'' or ``encrypt stop'' commands.
250
251
252 Note that the current version of telnet does not support
253 encryption.
254
255
256 environ arguments...
257 The environ command is used to propagate environ- ment
258 variables across the telnet link using the TELNET
259 ENVIRON protocol option. All variables exported from
260 the shell are defined, but only the DISPLAY and
261 PRINTER variables are marked to be sent by default.
262 The USER variable is marked to be sent if the -a or
263 -l command-line options were used.
264
265
266 Valid arguments for the environ command are:
267
268
269 define variable value
270 Define the variable variable to have a value of value. Any
271 variables defined by this command are automatically marked
272 for propagation (``exported''). The value may be enclosed in
273 single or double quotes so that tabs and spaces may be
274 included.
275
276
277 undefine variable
278 Remove any existing definition of variable.
279
280
281 export variable
282 Mark the specified variable for propa- gation to the remote
283 host.
284
285
286 unexport variable
287 Do not mark the specified variable for propagation to the
288 remote host. The remote host may still ask explicitly for
289 variables that are not exported.
290
291
292 list
293 List the current set of environment variables. Those marked
294 with a will be propagated to the remote host. The remote
295 host may still ask explicitly for the rest.
296
297
298 ?
299 Prints out help information for the environ
300 command.
301
302
303 logout
304 Send the TELNET LOGOUT protocol option to the
305 remote host. This command is similar to a close command. If
306 the remote host does not support the LOGOUT option,
307 nothing happens. But if it does, this command should cause
308 it to close the connec- tion. If the remote side also
309 supports the con- cept of suspending a user's session for
310 later reattachment, the logout command indicates that the
311 session should be terminated immediately.
312
313
314 mode type
315 Type is one of several options, depending on the state of
316 the session. Telnet asks the remote host to
317 go into the requested mode. If the remote host says it can,
318 that mode takes effect.
319
320
321 character
322 Disable the TELNET LINEMODE option, or, if the
323 remote side does not understand the LINEMODE
324 option, then enter ``character at a time``
325 mode.
326
327
328 line
329 Enable the TELNET LINEMODE option, or, if the
330 remote side does not understand the LINEMODE
331 option, then attempt to enter ``old-line-by-line``
332 mode.
333
334
335 isig (-isig)
336 Attempt to enable (disable) the TRAPSIG mode of the
337 LINEMODE option. This requires that the
338 LINEMODE option be enabled.
339
340
341 edit (-edit)
342 Attempt to enable (disable) the EDIT mode of the
343 LINEMODE option. This requires that the
344 LINEMODE option be enabled.
345
346
347 softtabs (-softtabs)
348 Attempt to enable (disable) the SOFT_TAB mode of
349 the LINEMODE option. This requires that the
350 LINEMODE option be enabled.
351
352
353 litecho (-litecho)
354 Attempt to enable (disable) the LIT_ECHO mode of
355 the LINEMODE option. This requires that the
356 LINEMODE option be enabled.
357
358
359 ?
360 Prints out help information for the mode
361 command.
362
363
364 open host
365 [[
366 [[-l] user
367 ][[
368 - port]
369 Open a connection to the named host. If no port number is
370 specified, telnet will attempt to con- tact a
371 telnet daemon at the standard port (23). The
372 host specification may be a host name or IP address. The -l
373 option may be used to specify a user name to be passed to
374 the remote system, like the -l command-line
375 option.
376
377
378 When connecting to ports other than the telnet port, telnet
379 does not attempt telnet protocol
380 negotiations. This makes it possible to connect to services
381 that do not support the telnet protocol
382 without making a mess. Protocol negotiation can be forced by
383 placing a dash before the port number.
384
385
386 After establishing a connection, any commands associated
387 with the remote host in /etc/telnetrc and the
388 user's .telnetrc file are executed, in that
389 order.
390
391
392 The format of the telnetrc files is as follows: Lines
393 beginning with a #, and blank lines, are ignored. The rest
394 of the file should consist of hostnames and sequences of
395 telnet commands to use with that host. Commands should be
396 one per line, indented by whitespace; lines beginning
397 without whitespace are interpreted as hostnames. Lines
398 beginning with the special hostname DEFAULT will
399 apply to all hosts. Upon connecting to a particu- lar host,
400 the commands associated with that host are
401 executed.
402
403
404 quit
405 Close any open session and exit telnet. An end of file
406 condition on input, when in command mode, will trigger this
407 operation as well.
408
409
410 send arguments
411 Send one or more special telnet protocol
412 character sequences to the remote host. The following are
413 the codes which may be specified (more than one may be used
414 in one command):
415
416
417 abort
418 Sends the TELNET ABORT (Abort Processes)
419 sequence.
420
421
422 ao
423 Sends the TELNET AO (Abort Output) sequence, which
424 should cause the remote system to flush all output
425 ''from'' the remote system ''to'' the user's
426 terminal.
427
428
429 ayt
430 Sends the TELNET AYT (Are You There?) sequence, to
431 which the remote system may or may not choose to
432 respond.
433
434
435 brk
436 Sends the TELNET BRK (Break) sequence, which may
437 have significance to the remote system.
438
439
440 ec
441 Sends the TELNET EC (Erase Character) sequence,
442 which should cause the remote system to erase the last
443 character entered.
444
445
446 el
447 Sends the TELNET EL (Erase Line) sequence, which
448 should cause the remote system to erase the line currently
449 being entered.
450
451
452 eof
453 Sends the TELNET EOF (End Of File)
454 sequence.
455
456
457 eor
458 Sends the TELNET EOR (End of Record)
459 sequence.
460
461
462 escape
463 Sends the current telnet escape character.
464
465
466 ga
467 Sends the TELNET GA (Go Ahead) sequence, which
468 likely has no significance to the remote
469 system.
470
471
472 getstatus
473 If the remote side supports the TELNET STATUS
474 command, getstatus will send the subnegotiation to request
475 that the server send its current option status.
476
477
478 ip
479 Sends the TELNET IP (Interrupt Process) sequence,
480 which should cause the remote system to abort the currently
481 running pro- cess.
482
483
484 nop
485 Sends the TELNET NOP (No Operation)
486 sequence.
487
488
489 susp
490 Sends the TELNET SUSP (Suspend Process)
491 sequence.
492
493
494 synch
495 Sends the TELNET SYNCH sequence. This sequence
496 causes the remote system to dis- card all previously typed
497 (but not yet read) input. This sequence is sent as
498 TCP urgent data (and may not work if the
499 remote system is a 4.2 BSD system -- if it
500 doesn't work, a lower case ``r'' may be echoed on the
501 terminal).
502
503
504 do cmd
505
506
507 dont cmd
508
509
510 will cmd
511
512
513 wont cmd
514 Sends the TELNET DO cmd sequence. cmd can be either
515 a decimal number between 0 and 255, or a symbolic name for a
516 specific TELNET command. cmd can also be either
517 help or ? to print out help information, including a list of
518 known symbolic names.
519
520
521 ?
522 Prints out help information for the send
523 command.
524
525
526 set argument value
527
528
529 unset argument value
530 The set command will set any one of a number of telnet
531 variables to a specific value or to TRUE. The
532 special value off turns off the function asso- ciated with
533 the variable. This is equivalent to using the unset command.
534 The unset command will disable or set to FALSE any
535 of the specified vari- ables. The values of variables may be
536 interro- gated with the display command. The variables which
537 may be set or unset, but not toggled, are listed here. In
538 addition, any of the variables for the toggle command may be
539 explicitly set or unset.
540
541
542 ayt
543 If telnet is in localchars mode, or
544 LINEMODE is enabled, and the status charac- ter is
545 typed, a TELNET AYT sequence is sent to the remote
546 host. The initial value for the
547
548
549 echo
550 This is the value (initially ``^E'') which, when in ``line
551 by line'' mode, toggles between doing local echoing of
552 entered characters (for normal processing), and suppressing
553 echoing of entered characters (for entering, say, a
554 password).
555
556
557 eof
558 If telnet is operating in LINEMODE or ``old line by
559 line'' mode, entering this charac- ter as the first
560 character on a line will cause this character to be sent to
561 the remote system. The initial value of the eof character is
562 taken to be the terminal's eof character.
563
564
565 erase
566 If telnet is in localchars mode (see toggle localchars
567 below), __and__ if telnet is operat- ing in ``character
568 at a time'' mode, then when this character is typed, a
569 TELNET EC sequence (see send ec above) is sent to
570 the remote system. The initial value for the erase character
571 is taken to be the termi- nal's erase
572 character.
573
574
575 escape
576 This is the telnet escape character (ini- tially ``^[['')
577 which causes entry into telnet command mode (when connected
578 to a remote system).
579
580
581 flushoutput
582 If telnet is in localchars mode (see toggle localchars
583 below) and the flushoutput char- acter is typed, a
584 TELNET AO sequence (see send ao above) is sent to
585 the remote host. The initial value for the flush character
586 is taken to be the terminal's flush charac-
587 ter.
588
589
590 forw1
591
592
593 forw2
594 If TELNET is operating in LINEMODE,
595 these are the characters that, when typed, cause partial
596 lines to be forwarded to the remote system. The initial
597 value for the forward- ing characters are taken from the
598 termi- nal's eol and eol2 characters.
599
600
601 interrupt
602 If telnet is in localchars mode (see toggle localchars
603 below) and the interrupt charac- ter is typed, a TELNET
604 IP sequence (see send ip above) is sent to the remote
605 host. The initial value for the interrupt charac- ter is
606 taken to be the terminal's intr character.
607
608
609 kill
610 If telnet is in localchars mode (see toggle localchars
611 below), and if telnet is operat- ing in ``character at a
612 time'' mode, then when this character is typed, a TELNET
613 EL sequence (see send el above) is sent to the remote
614 system. The initial value for the kill character is taken to
615 be the termi- nal's kill character.
616
617
618 lnext
619 If telnet is operating in LINEMODE or ``old line by
620 line`` mode, then this character is taken to be the
621 terminal's lnext character. The initial value for the lnext
622 character is taken to be the terminal's lnext charac-
623 ter.
624
625
626 quit
627 If telnet is in localchars mode (see toggle localchars
628 below) and the quit character is typed, a TELNET
629 BRK sequence (see send brk above) is sent to the remote
630 host. The initial value for the quit character is taken to
631 be the terminal's quit character.
632
633
634 reprint
635 If telnet is operating in LINEMODE or ``old line by
636 line`` mode, then this character is taken to be the
637 terminal's reprint charac- ter. The initial value for the
638 reprint character is taken to be the terminal's reprint
639 character.
640
641
642 rlogin
643 This is the rlogin mode escape character. Setting it enables
644 rlogin mode, as with the r command-line option
645 (q.v.)
646
647
648 start
649 If the TELNET TOGGLE-FLOW-CONTROL option has been
650 enabled, then this character is taken to be the terminal's
651 start character. The initial value for the kill character is
652 taken to be the terminal's start character.
653
654
655 stop
656 If the TELNET TOGGLE-FLOW-CONTROL option has been
657 enabled, then this character is taken to be the terminal's
658 stop character. The initial value for the kill character is
659 taken to be the terminal's stop character.
660
661
662 susp
663 If telnet is in localchars mode, or LINEMODE is
664 enabled, and the suspend char- acter is typed, a TELNET
665 SUSP sequence (see send susp above) is sent to the
666 remote host. The initial value for the suspend character is
667 taken to be the terminal's suspend character.
668
669
670 tracefile
671 This is the file to which the output, caused by netdata or
672 option tracing being TRUE, will be written. If it
673 is set to ``-'', then tracing information will be written to
674 standard output (the default).
675
676
677 worderase
678 If telnet is operating in LINEMODE or ``old line by
679 line`` mode, then this character is taken to be the
680 terminal's worderase char- acter. The initial value for the
681 worderase character is taken to be the terminal's worderase
682 character.
683
684
685 ?
686 Displays the legal set (unset) commands.
687
688
689 slc state
690 The slc command (Set Local Characters) is used to set or
691 change the state of the the special charac- ters when the
692 TELNET LINEMODE option has been enabled. Special
693 characters are characters that get mapped to
694 TELNET commands sequences (like ip or quit)
695 or line editing characters (like erase and kill). By
696 default, the local special charac- ters are
697 exported.
698
699
700 check
701 Verify the current settings for the current special
702 characters. The remote side is requested to send all the
703 cur- rent special character settings, and if there are any
704 discrepancies with the local side, the local side will
705 switch to the remote value.
706
707
708 export
709 Switch to the local defaults for the special characters. The
710 local default characters are those of the local ter- minal
711 at the time when telnet was started.
712
713
714 import
715 Switch to the remote defaults for the special characters.
716 The remote default characters are those of the remote sys-
717 tem at the time when the TELNET connec- tion
718 was established.
719
720
721 ?
722 Prints out help information for the slc
723 command.
724
725
726 status
727 Show the current status of telnet. This includes the name of
728 the remote host, if any, as well as the current
729 mode.
730
731
732 toggle arguments ...
733 Toggle (between TRUE and FALSE) various
734 flags that control how telnet responds to events. These
735 flags may be set explicitly to TRUE or
736 FALSE using the set and unset commands. More than
737 one flag may be toggled at once. The state of these flags
738 may be examined with the display command. Valid flags
739 are:
740
741
742 authdebug
743 Turns on debugging for the authenti- cation code. This flag
744 only exists if authentication support is
745 enabled.
746
747
748 autoflush
749 If autoflush and localchars are both TRUE, then
750 when the ao, or quit char- acters are recognized (and trans-
751 formed into TELNET sequences; see set above
752 for details), telnet refuses to display any data on the
753 user's termi- nal until the remote system acknowl- edges
754 (via a TELNET TIMING MARK option) that it has
755 processed those TELNET sequences. The initial
756 value for this toggle is TRUE if the termi- nal
757 user had not done an
758 FALSE (see stty(1)).
759
760
761 autodecrypt
762 When the TELNET ENCRYPT option is negotiated, by
763 default the actual encryption (decryption) of the data
764 stream does not start automatically. The autoencrypt
765 (autodecrypt) command states that encryption of the output
766 (input) stream should be enabled as soon as
767 possible.
768
769
770 Note that this flag exists only if encryption support is
771 enabled.
772
773
774 autologin
775 If the remote side supports the TELNET
776 AUTHENTICATION option, telnet attempts
777 to use it to perform auto- matic authentication. If the
778 TELNET AUTHENTICATION option is not sup- ported,
779 the user's login name is propagated using the TELNET
780 ENVIRON option. Setting this flag is the same as
781 specifying the a option to the open command or on the
782 command line.
783
784
785 autosynch
786 If autosynch and localchars are both TRUE, then
787 when either the intr or quit characters is typed (see set
788 above for descriptions of the intr and quit characters), the
789 resulting telnet sequence sent is followed by
790 the TELNET SYNCH sequence. This pro- cedure should
791 cause the remote system to begin throwing away all
792 previously typed input until both of the
793 telnet sequences have been read and acted
794 upon. The initial value of this tog- gle is
795 FALSE.
796
797
798 binary
799 Enable or disable the TELNET BINARY option on both
800 input and output.
801
802
803 inbinary
804 Enable or disable the TELNET BINARY option on
805 input.
806
807
808 outbinary
809 Enable or disable the TELNET BINARY option on
810 output.
811
812
813 crlf
814 If this is TRUE, then carriage returns will be sent
815 as . If this is FALSE,
816 then carriage returns will be send as
817 . The ini- tial value for this
818 toggle is FALSE.
819
820
821 crmod
822 Toggle carriage return mode. When this mode is enabled, most
823 carriage return characters received from the remote host
824 will be mapped into a carriage return followed by a line
825 feed. This mode does not affect those characters typed by
826 the user, only those received from the remote host. This
827 mode is not very useful unless the remote host only sends
828 carriage return, but never line feed. The initial value for
829 this toggle is FALSE.
830
831
832 debug
833 Toggles socket level debugging (use- ful only to the super
834 user). The initial value for this toggle is
835 FALSE.
836
837
838 encdebug
839 Turns on debugging information for the encryption code. Note
840 that this flag only exists if encryption sup- port is
841 available.
842
843
844 localchars
845 If this is TRUE, then the flush, interrupt, quit,
846 erase, and kill characters (see set above) are recog- nized
847 locally, and transformed into (hopefully) appropriate
848 TELNET con- trol sequences (respectively ao,
849 ip, brk, ec, and el; see send above). The initial value for
850 this toggle is TRUE in ``old line by line'' mode,
851 and FALSE in ``character at a time'' mode. When the
852 LINEMODE option is enabled, the value of localchars
853 is ignored, and assumed to always be TRUE. If
854 LINEMODE has ever been enabled, then quit is sent
855 as abort, and eof and are sent as eof and susp, see send
856 above).
857
858
859 netdata
860 Toggles the display of all network data (in hexadecimal
861 format). The initial value for this toggle is
862 FALSE.
863
864
865 options
866 Toggles the display of some internal telnet protocol
867 processing (having to do with telnet
868 options). The initial value for this toggle is
869 FALSE.
870
871
872 prettydump
873 When the netdata toggle is enabled, if prettydump is enabled
874 the output from the netdata command will be for- matted in a
875 more user-readable for- mat. Spaces are put between each
876 character in the output, and the beginning of
877 telnet escape sequences are preceded by a ''
878 to aid in locat- ing them.
879
880
881 skiprc
882 When the skiprc toggle is TRUE,
883 telnet does not read the telnetrc files. The
884 initial value for this toggle is
885 FALSE.
886
887
888 termdata
889 Toggles the display of all terminal data (in hexadecimal
890 format). The initial value for this toggle is
891 FALSE.
892
893
894 verbose_encrypt
895 When the verbose_encrypt toggle is TRUE,
896 TELNET prints out a message each time
897 encryption is enabled or disabled. The initial value for
898 this toggle is FALSE. This flag only exists if
899 encryption support is available.
900
901
902 ?
903 Displays the legal toggle commands.
904
905
906 z
907 Suspend telnet. This command only works when the user is
908 using the csh(1).
909
910
911 ! [[command]
912 Execute a single command in a subshell on the local system.
913 If command is omitted, then an interactive subshell is
914 invoked.
915
916
917 ? [[command]
918 Get help. With no arguments, telnet prints a help summary.
919 If a command is specified, telnet will print the help
920 information for just that command.
921
922
923 __ENVIRONMENT__
924
925
926 Telnet uses at least the HOME, SHELL,
927 DISPLAY, and TERM environment variables.
928 Other environment variables may be propagated to the other
929 side via the TELNET ENVIRON option.
930 __FILES__
931 /etc/telnetrc
932
933
934 global telnet startup values
935 ~/.telnetrc
936 user customized telnet startup values
937
938
939 __HISTORY__
940
941
942 The Telnet command appeared in 4.2 BSD
943 .
944 __NOTES__
945
946
947 On some remote systems, echo has to be turned off manually when in ``old line by line'' mode.
948
949
950 In ``old line by line'' mode or LINEMODE the
951 terminal's eof character is only recognized (and sent to the
952 remote system) when it is the first character on a
953 line.
954 __BUGS__
955
956
957 The source code is not comprehensible.
958
959
960 Linux !NetKit (0.17) August 15, 1999 1
961 ----
3 StuartYeates 962 CategoryNetworking
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