1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
|
<HTML>
<BODY>
<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
</PRE>
<H2>NAME</H2><PRE>
telnet - user interface to the TELNET protocol
</PRE>
<H2>SYNOPSIS</H2><PRE>
<B>telnet</B> [<B>-8</B>] [<B>-E</B>] [<B>-F</B>] [<B>-K</B>] [<B>-L</B>] [<B>-S</B> <I>tos</I>] [<B>-X</B> <I>authtype</I>] [<B>-a</B>]
[<B>-c</B>] [<B>-d</B>] [<B>-e</B> <I>escapechar</I>] [<B>-f</B>] [<B>-k</B> <I>realm</I>] [<B>-l</B> <I>user</I>] [<B>-n</B> <I>tra-</I>
<I>cefile</I>] [<B>-r</B>] [<B>-x</B>] [<I>host</I> [<I>port</I>]]
</PRE>
<H2>DESCRIPTION</H2><PRE>
The <B>telnet</B> command is used to communicate with another host
using the TELNET protocol. If <B>telnet</B> is invoked without the
<I>host</I> argument, it enters command mode, indicated by its
prompt ( <B>telnet></B>). In this mode, it accepts and executes
the commands listed below. If it is invoked with arguments,
it performs an <B>open</B> command with those arguments.
</PRE>
<H2>OPTIONS</H2><PRE>
-<B>8</B> Specify an 8-bit data path. This causes an attempt to
negotiate the TELNET BINARY option on both input and
output.
-<B>E</B> Stop any character from being recognized as an escape
character.
<B>-F</B> forward a <I>forwardable</I> copy of the local credentials to
the remote system.
<B>-K</B> Specify no automatic login to the remote system.
-<B>L</B> Specify an 8-bit data path on output. This causes the
BINARY option to be negotiated on output.
<B>-S</B> <I>tos</I>
Set the IP type-of-service (TOS) option for the telnet
connection to the value <I>tos</I>, which can be a numeric TOS
value (in decimal, 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.
<B>-X</B> <I>atype</I>
Disable the <I>atype</I> type of authentication.
<B>-a</B> 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 <B>getlogin(2)</B> if it agrees
with the current user ID; otherwise it is the name
associated with the user ID.
-<B>c</B> Disable the reading of the user's <B>.telnetrc</B> file. (See
the <B>toggle</B> <B>skiprc</B> command on this man page.)
-<B>d</B> Set the initial value of the <B>debug</B> flag to TRUE
<B>-e</B> <I>escape</I> <I>char</I>
Set the initial <B>telnet</B> escape character to <I>escape</I> <I>char</I>.
If <I>escape</I> <I>char</I> is omitted, then there will be no escape
character.
<B>-f</B> forward a copy of the local credentials to the remote
system.
<B>-k</B> <I>realm</I>
If Kerberos authentication is being used, request that
telnet obtain tickets for the remote host in realm
<I>realm</I> instead of the remote host's realm, as determined
by <B>krb_realmofhost(3)</B>.
<B>-l</B> <I>user</I>
If the remote system understands the ENVIRON option,
then <I>user</I> will be sent to the remote system as the
value for the variable USER. This option implies the -<B>a</B>
option. This option may also be used with the <B>open</B>
command.
<B>-n</B> <I>tracefile</I>
Open <I>tracefile</I> for recording trace information. See
the <B>set</B> <B>tracefile</B> command below.
-<B>r</B> Specify a user interface similar to <B>rlogin(1)</B>. In this
mode, the escape character is set to the tilde (~)
character, unless modified by the -<B>e</B> option.
<B>-x</B> Turn on encryption of the data stream. When this
option is turned on, <B>telnet</B> will exit with an error if
authentication cannot be negotiated or if encryption
cannot be turned on.
<I>host</I> Indicates the name, alias, or Internet address of the
remote host.
<I>port</I> Indicates a port number (address of an application).
If the port is not specified, the default <B>telnet</B> port
(23) is used.
When in rlogin mode, ~ is the telnet escape character; a
line of the form ~. disconnects from the remote host. Simi-
larly, the line ~^Z suspends the telnet session. The line
~^] escapes to the normal telnet escape prompt.
Once a connection has been opened, <B>telnet</B> will attempt to
enable the TELNET LINEMODE option. If this fails, then <B>tel-</B>
<B>net</B> will revert to one of two input modes: either ``charac-
ter 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 immedi-
ately sent to the remote host for processing.
In ``old line by line'' mode, all text is echoed locally,
and (normally) only completed lines are sent to the remote
host. The ``local echo character'' (initially ``^E'') may
be used to turn off and on the local echo. (This would
mostly be used to enter passwords without the password being
echoed).
If the LINEMODE option is enabled, or if the <B>localchars</B> flag
is TRUE (the default for ``old line by line''; see below),
the user's <B>quit</B>, <B>intr</B>, and <B>flush</B> characters are trapped
locally, and sent as TELNET protocol sequences to the remote
side. If LINEMODE has ever been enabled, then the user's
<B>susp</B> and <B>eof</B> are also sent as TELNET protocol sequences, and
<B>quit</B> is sent as a TELNET ABORT instead of BREAK. There are
options (see <B>toggle</B> <B>autoflush</B> and <B>toggle</B> <B>autosynch</B> below)
which cause this action to flush subsequent output to the
terminal (until the remote host acknowledges the TELNET
sequence) and flush previous terminal input (in the case of
<B>quit</B> and <B>intr</B>).
While connected to a remote host, <B>telnet</B> command mode may be
entered by typing the <B>telnet</B> ``escape character'' (initially
``^]''). When in command mode, the normal terminal editing
conventions are available.
The following <B>telnet</B> commands are available. Only enough of
each command to uniquely identify it need be typed (this is
also true for arguments to the <B>mode</B>, <B>set</B>, <B>toggle</B>, <B>unset</B>,
<B>slc</B>, <B>environ</B>, and <B>display</B> commands).
<B>auth</B> <I>argument</I> ...
The auth command manipulates the information sent
through the TELNET AUTHENTICATE option. Valid argu-
ments for the auth command are as follows:
<B>disable</B> <I>type</I>
Disables the specified type of authentication. To
obtain a list of available types, use the <B>auth</B>
<B>disable</B> <B>?</B> command.
<B>enable</B> <I>type</I>
Enables the specified type of authentication. To
obtain a list of available types, use the <B>auth</B>
<B>enable</B> <B>?</B> command.
<B>status</B>
Lists the current status of the various types of
authentication.
<B>close</B>
Close a TELNET session and return to command mode.
<B>display</B> <I>argument</I> ...
Displays some or all of the <B>set</B> and <B>toggle</B> values (see
below).
<B>encrypt</B> <I>argument</I> ...
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:
<B>disable</B> <I>type</I> [<B>input</B>|<B>output</B>]
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 <B>encrypt</B> <B>disable</B> <B>?</B> command.
<B>enable</B> <I>type</I>]<I>fP</I> [<B>input</B>|<B>output</B>]
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 <B>encrypt</B> <B>enable</B> <B>?</B> command.
<B>input</B>
This is the same as the <B>encrypt</B> <B>start</B> <B>input</B> com-
mand.
-<B>input</B>
This is the same as the <B>encrypt</B> <B>stop</B> <B>input</B> com-
mand.
<B>output</B>
This is the same as the <B>encrypt</B> <B>start</B> <B>output</B> com-
mand.
-<B>output</B>
This is the same as the <B>encrypt</B> <B>stop</B> <B>output</B> com-
mand.
<B>start</B> [<B>input</B>|<B>output</B>]
Attempts to start encryption. If you omit <B>input</B>
and <B>output</B>, both input and output are enabled. To
obtain a list of available types, use the <B>encrypt</B>
<B>enable</B> <B>?</B> command.
<B>status</B>
Lists the current status of encryption.
<B>stop</B> [<B>input</B>|<B>output</B>]
Stops encryption. If you omit input and output,
encryption is on both input and output.
<B>type</B> <I>type</I>
Sets the default type of encryption to be used
with later <B>encrypt</B> <B>start</B> or <B>encrypt</B> <B>stop</B> commands.
<B>environ</B> <I>arguments</I> ...
The <B>environ</B> command is used to manipulate the the vari-
ables 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 -<B>a</B> or -<B>l</B> options are used.
Valid arguments for the <B>environ</B> command are:
<B>define</B> <I>variable</I> <I>value</I>
Define the variable <I>variable</I> to have a value of
<I>value</I>. Any variables defined by this command are
automatically exported. The <I>value</I> may be enclosed
in single or double quotes so that tabs and spaces
may be included.
<B>undefine</B> <I>variable</I>
Remove <I>variable</I> from the list of environment vari-
ables.
<B>export</B> <I>variable</I>
Mark the variable <I>variable</I> to be exported to the
remote side.
<B>unexport</B> <I>variable</I>
Mark the variable <I>variable</I> to not be exported
unless explicitly asked for by the remote side.
<B>list</B> List the current set of environment variables.
Those marked with a * will be sent automatically;
other variables will only be sent if explicitly
requested.
<B>?</B> Prints out help information for the <B>environ</B>
command.
<B>logout</B>
Sends the TELNET LOGOUT option to the remote side.
This command is similar to a <B>close</B> 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 argu-
ment indicates that you should terminate the session
immediately.
<B>mode</B> <I>type</I>
<I>Type</I> 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.
<B>character</B>
Disable the TELNET LINEMODE option, or, if the
remote side does not understand the LINEMODE
option, then enter ``character at a time'' mode.
<B>line</B> 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.
<B>isig</B> (-<I>isig</I>)
Attempt to enable (disable) the TRAPSIG mode of
the LINEMODE option. This requires that the
LINEMODE option be enabled.
<B>edit</B> (<B>-edit</B>)
Attempt to enable (disable) the EDIT mode of the
LINEMODE option. This requires that the LINEMODE
option be enabled.
<B>softtabs</B> (<B>-softtabs</B>)
Attempt to enable (disable) the SOFT_TAB mode of
the LINEMODE option. This requires that the
LINEMODE option be enabled.
<B>litecho</B> (<B>-litecho</B>)
Attempt to enable (disable) the LIT_ECHO mode of
the LINEMODE option. This requires that the
LINEMODE option be enabled.
<B>?</B> Prints out help information for the <B>mode</B> command.
<B>open</B> <I>host</I> [<B>-a</B>] [[<B>-l</B>] <I>user</I>] [<B>-</B><I>port</I>]
Open a connection to the named host. If no port number
is specified, <B>telnet</B> will attempt to contact a TELNET
server at the default port. The host specification may
be either a host name (see <B>hosts(5)</B> or an Internet
address specified in the ``dot notation'' (see <B>inet(3)</B>.
After establishing a connection, the file <B>.telnetrc</B> 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 successive lines that begin with white
space are assumed to be <B>telnet</B> commands and are pro-
cessed as if they had been typed in manually to the
<B>telnet</B> command prompt.
-<B>a</B> 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 <I>getlo-</I>
<B>gin(2)</B> if it agrees with the current user ID; oth-
erwise it is the name associated with the user ID.
[<B>-l</B>] <I>user</I>
may be used to specify the user name to be passed
to the remote system via the ENVIRON option.
<B>-</B><I>port</I>
When connecting to a non-standard port, <B>telnet</B>
omits any automatic initiation of TELNET options.
When the port number is preceded by a minus sign,
the initial option negotiation is done.
<B>quit</B> Close any open TELNET session and exit <B>telnet</B>. An end
of file (in command mode) will also close a session and
exit.
<B>send</B> <I>arguments</I>
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):
<B>abort</B>
Sends the TELNET ABORT (Abort processes) sequence.
<B>ao</B> Sends the TELNET AO (Abort Output) sequence, which
should cause the remote system to flush all output
<I>from</I> the remote system <I>to</I> the user's terminal.
<B>ayt</B> Sends the TELNET AYT (Are You There) sequence, to
which the remote system may or may not choose to
respond.
<B>brk</B> Sends the TELNET BRK (Break) sequence, which may
have significance to the remote system.
<B>ec</B> Sends the TELNET EC (Erase Character) sequence,
which should cause the remote system to erase the
last character entered.
<B>el</B> Sends the TELNET EL (Erase Line) sequence, which
should cause the remote system to erase the line
currently being entered.
<B>eof</B> Sends the TELNET EOF (End Of File) sequence.
<B>eor</B> Sends the TELNET EOR (End of Record) sequence.
<B>escape</B>
Sends the current escape character (initially
``^''.
<B>ga</B> Sends the TELNET GA (Go Ahead) sequence, which
likely has no significance to the remote system.
<B>getstatus</B>
If the remote side supports the TELNET STATUS com-
mand, <B>getstatus</B> will send the subnegotiation to
request that the server send its current option
status.
<B>ip</B> Sends the TELNET IP (Interrupt Process) sequence,
which should cause the remote system to abort the
currently running process.
<B>nop</B> Sends the TELNET NOP (No OPeration) sequence.
<B>susp</B> Sends the TELNET SUSP (SUSPend process) sequence.
<B>synch</B>
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 ter-
minal).
<B>do</B> <I>cmd</I>
<B>dont</B> <I>cmd</I>
<B>will</B> <I>cmd</I>
<B>wont</B> <I>cmd</I>
Sends the TELNET DO <I>cmd</I> sequence. <I>Cmd</I> can be
either a decimal number between 0 and 255, or a
symbolic name for a specific TELNET command. <I>Cmd</I>
can also be either <B>help</B> or <B>?</B> to print out help
information, including a list of known symbolic
names.
<B>?</B> Prints out help information for the <B>send</B> command.
<B>set</B> <I>argument</I> <I>value</I>
<B>unset</B> <I>argument</I> <I>value</I>
The <B>set</B> command will set any one of a number of <B>telnet</B>
variables to a specific value or to TRUE. The special
value <B>off</B> turns off the function associated with the
variable; this is equivalent to using the <B>unset</B> com-
mand. The <B>unset</B> command will disable or set to FALSE
any of the specified functions. The values of vari-
ables may be interrogated with the <B>display</B> command.
The variables which may be set or unset, but not tog-
gled, are listed here. In addition, any of the vari-
ables for the <B>toggle</B> command may be explicitly set or
unset using the <B>set</B> and <B>unset</B> commands.
<B>ayt</B> If <B>telnet</B> is in localchars mode, or LINEMODE is
enabled, and the status character is typed, a TEL-
NET AYT sequence (see <B>send</B> <B>ayt</B> preceding) is sent
to the remote host. The initial value for the
"Are You There" character is the terminal's status
character.
<B>echo</B> This is the value (initially ``^E'') which, when
in ``line by line'' mode, toggles between doing
local echoing of entered characters (for normal
processing), and suppressing echoing of entered
characters (for entering, say, a password).
<B>eof</B> If <B>telnet</B> is operating in LINEMODE or ``old line
by line'' mode, entering this character as the
first character on a line will cause this charac-
ter to be sent to the remote system. The initial
value of the eof character is taken to be the
terminal's <B>eof</B> character.
<B>erase</B>
If <B>telnet</B> is in mode (see <B>toggle</B> <B>localchars</B>
below), <I>and</I> if <B>telnet</B> is operating in ``character
at a time'' mode, then when this character is
typed, a TELNET EC sequence (see <B>send</B> <B>ec</B> above) is
sent to the remote system. The initial value for
the erase character is taken to be the terminal's
<B>erase</B> character.
<B>escape</B>
This is the <B>telnet</B> escape character (initially
``^['') which causes entry into <B>telnet</B> command
mode (when connected to a remote system).
<B>flushoutput</B>
If <B>telnet</B> is in <B>localchars</B> mode (see <B>toggle</B> <B>local-</B>
<B>chars</B> below) and the <B>flushoutput</B> character is
typed, a TELNET AO sequence (see <B>send</B> <B>ao</B> above) is
sent to the remote host. The initial value for
the flush character is taken to be the terminal's
<B>flush</B> character.
<B>forw1</B>
<B>forw2</B>
If <B>telnet</B> is operating in LINEMODE, these are the
characters that, when typed, cause partial lines
to be forwarded to the remote system. The initial
value for the forwarding characters are taken from
the terminal's eol and eol2 characters.
<B>interrupt</B>
If <B>telnet</B> is in <B>localchars</B> mode (see <B>toggle</B> <B>local-</B>
<B>chars</B> below) and the <B>interrupt</B> character is typed,
a TELNET IP sequence (see <B>send</B> <B>ip</B> above) is sent
to the remote host. The initial value for the
interrupt character is taken to be the terminal's
<B>intr</B> character.
<B>kill</B> If <B>telnet</B> is in <B>localchars</B> mode (see <B>toggle</B> <B>local-</B>
<B>chars</B> below), <I>and</I> if <B>telnet</B> is operating in
``character at a time'' mode, then when this char-
acter is typed, a TELNET EL sequence (see <B>send</B> <B>el</B>
above) is sent to the remote system. The initial
value for the kill character is taken to be the
terminal's <B>kill</B> character.
<B>lnext</B>
If <B>telnet</B> is operating in LINEMODE or ``old line
by line'' mode, then this character is taken to be
the terminal's <B>lnext</B> character. The initial value
for the lnext character is taken to be the
terminal's <B>lnext</B> character.
<B>quit</B> If <B>telnet</B> is in <B>localchars</B> mode (see <B>toggle</B> <B>local-</B>
<B>chars</B> below) and the <B>quit</B> character is typed, a
TELNET BRK sequence (see <B>send</B> <B>brk</B> above) is sent
to the remote host. The initial value for the
quit character is taken to be the terminal's <B>quit</B>
character.
<B>reprint</B>
If <B>telnet</B> is operating in LINEMODE or ``old line
by line'' mode, then this character is taken to be
the terminal's <B>reprint</B> character. The initial
value for the reprint character is taken to be the
terminal's <B>reprint</B> character.
<B>rlogin</B>
This is the rlogin escape character. If set, the
normal <B>TELNET</B> escape character is ignored unless
it is preceded by this character at the beginning
of a line. This character, at the beginning of a
line followed by a "." closes the connection;
when followed by a ^Z it suspends the telnet com-
mand. The initial state is to disable the rlogin
escape character.
<B>start</B>
If the TELNET TOGGLE-FLOW-CONTROL option has been
enabled, then this character is taken to be the
terminal's <B>start</B> character. The initial value for
the kill character is taken to be the terminal's
<B>start</B> character.
<B>stop</B> If the TELNET TOGGLE-FLOW-CONTROL option has been
enabled, then this character is taken to be the
terminal's <B>stop</B> character. The initial value for
the kill character is taken to be the terminal's
<B>stop</B> character.
<B>susp</B> If <B>telnet</B> is in <B>localchars</B> mode, or LINEMODE is
enabled, and the <B>suspend</B> character is typed, a
TELNET SUSP sequence (see <B>send</B> <B>susp</B> above) is sent
to the remote host. The initial value for the
suspend character is taken to be the terminal's
<B>suspend</B> character.
<B>tracefile</B>
This is the file to which the output, caused by
<B>netdata</B> or <B>option</B> tracing being TRUE, will be
written. If it is set to ``<B>-</B>'', then tracing
information will be written to standard output
(the default).
<B>worderase</B>
If <B>telnet</B> is operating in LINEMODE or ``old line
by line'' mode, then this character is taken to be
the terminal's <B>worderase</B> character. The initial
value for the worderase character is taken to be
the terminal's <B>worderase</B> character.
<B>?</B> Displays the legal <B>set</B> (<B>unset</B>) commands.
<B>slc</B> <I>state</I>
The <B>slc</B> 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 <B>telnet</B>
commands sequences (like <B>ip</B> or <B>quit</B> <B>)</B> or line editing
characters (like <B>erase</B> and <B>kill</B>). By default, the
local special characters are exported.
<B>check</B>
Verify the current settings for the current spe-
cial characters. The remote side is requested to
send all the current special character settings,
and if there are any discrepancies with the local
side, the local side will switch to the remote
value.
<B>export</B>
Switch to the local defaults for the special char-
acters. The local default characters are those of
the local terminal at the time when <B>telnet</B> was
started.
<B>import</B>
Switch to the remote defaults for the special
characters. The remote default characters are
those of the remote system at the time when the
TELNET connection was established.
<B>?</B> Prints out help information for the <B>slc</B> command.
<B>status</B>
Show the current status of <B>telnet</B>. This includes the
peer one is connected to, as well as the current mode.
<B>toggle</B> <I>arguments</I> ...
Toggle (between TRUE and FALSE) various flags that con-
trol how <B>telnet</B> responds to events. These flags may be
set explicitly to TRUE or FALSE using the <B>set</B> and <B>unset</B>
commands listed above. More than one argument may be
specified. The state of these flags may be interro-
gated with the <B>display</B> command. Valid arguments are:
<B>authdebug</B>
Turns on debugging information for the authentica-
tion code.
<B>autoflush</B>
If <B>autoflush</B> and <B>localchars</B> are both TRUE , then
when the <B>ao</B>, or <B>quit</B> characters are recognized
(and transformed into TELNET sequences; see <B>set</B>
above for details), <B>telnet</B> refuses to display any
data on the user's terminal until the remote sys-
tem acknowledges (via a TELNET TIMING MARK option)
that it has processed those TELNET sequences. The
initial value for this toggle is TRUE if the ter-
minal user had not done an "stty noflsh", other-
wise FALSE (see <B>stty(1)</B>.
<B>autodecrypt</B>
When the TELNET ENCRYPT option is negotiated, by
default the actual encryption (decryption) of the
data stream does not start automatically. The
autoencrypt (autodecrypt) 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.
<B>autologin</B>
If the remote side supports the TELNET AUTHENTICA-
TION option <B>telnet</B> attempts to use it to perform
automatic authentication. If the AUTHENTICATION
option is not supported, the user's login name are
propagated through the TELNET ENVIRON option.
This command is the same as specifying the -<B>a</B>
option on the <B>open</B> command.
<B>autosynch</B>
If <B>autosynch</B> and <B>localchars</B> are both TRUE, then
when either the <B>intr</B> or <B>quit</B> characters is typed
(see <B>set</B> above for descriptions of the <B>intr</B> and
<B>quit</B> characters), the resulting TELNET sequence
sent is followed by the TELNET SYNCH sequence.
This procedure <I>should</I> 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.
<B>binary</B>
Enable or disable the TELNET BINARY option on both
input and output.
<B>inbinary</B>
Enable or disable the TELNET BINARY option on
input.
<B>outbinary</B>
Enable or disable the TELNET BINARY option on out-
put.
<B>crlf</B> 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.
<B>crmod</B>
Toggle carriage return mode. When this mode is
enabled, most carriage return characters received
from the remote host will be mapped into a car-
riage 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
.
<B>debug</B>
Toggles socket level debugging (useful only to the
<B>super</B> <B>user</B>). The initial value for this toggle is
FALSE .
<B>encdebug</B>
Turns on debugging information for the encryption
code.
<B>localchars</B>
If this is TRUE , then the <B>flush</B>, <B>interrupt</B>, <B>quit</B>,
<B>erase</B>, and <B>kill</B> characters (see <B>set</B> above) are
recognized locally, and transformed into (hope-
fully) appropriate TELNET control sequences
(respectively <B>ao</B>, <B>ip</B>, <B>brk</B>, <B>ec</B>, and <B>el</B>; see <B>send</B>
above). The initial value for this toggle is TRUE
in ``old line by line'' mode, and FALSE in ``char-
acter at a time'' mode. When the LINEMODE option
is enabled, the value of <B>localchars</B> is ignored,
and assumed to always be TRUE. If LINEMODE has
ever been enabled, then <B>quit</B> is sent as <B>abort</B>, and
<B>eof</B> and <B>suspend</B> are sent as <B>eof</B> and <B>susp</B>, see <B>send</B>
above).
<B>netdata</B>
Toggles the display of all network data (in hexa-
decimal format). The initial value for this tog-
gle is FALSE.
<B>options</B>
Toggles the display of some internal <B>telnet</B>
protocol processing (having to do with TELNET
options). The initial value for this flag is
FALSE .
<B>prettydump</B>
When the <B>netdata</B> flag is enabled, if <B>prettydump</B> is
enabled the output from the <B>netdata</B> command will
be formatted in a more user-readable format.
Spaces are put between each character in the out-
put, and the beginning of any TELNET escape
sequence is preceded by a '*' to aid in locating
them.
<B>skiprc</B>
When the skiprc flag is TRUE, TELNET skips the
reading of the .telnetrc file in the user's home
directory when connections are opened. The ini-
tial value for this flag is FALSE.
<B>termdata</B>
Toggles the display of all terminal data (in hexa-
decimal format). The initial value for this flag
is FALSE.
<B>verbose_encrypt</B>
When the <B>verbose_encrypt</B> 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 con-
trols, data encryption is not supported outside of
the United States and Canada.
<B>?</B> Displays the legal <B>toggle</B> commands.
<B>z</B> Suspend <B>telnet</B>. This command only works when the
user's shell is <B>csh(1)</B>.
<B>!</B> [<I>command</I>]
Execute a single command in a subshell on the local
system. If <B>command</B> is omitted, then an interactive
subshell is invoked.
<B>?</B> <I>command</I>
Get help. With no arguments, prints a help summary.
If a command is specified, will print the help informa-
tion for just that command.
</PRE>
<H2>ENVIRONMENT</H2><PRE>
<B>Telnet</B> 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.
</PRE>
<H2>FILES</H2><PRE>
The <B>Telnet</B> command appeared in 4.2BSD.
</PRE>
<H2>NOTES</H2><PRE>
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 <B>eof</B>
character is only recognized (and sent to the remote system)
when it is the first character on a line.
</PRE>
<HR>
<ADDRESS>
Man(1) output converted with
<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
</ADDRESS>
</BODY>
</HTML>
|
