+TELNET(1) BSD Reference Manual TELNET(1)
+
+N\bNA\bAM\bME\bE
+ t\bte\bel\bln\bne\bet\bt - user interface to the TELNET protocol
+
+S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
+ t\bte\bel\bln\bne\bet\bt [-\b-d\bd] [-\b-a\ba] [-\b-n\bn _\bt_\br_\ba_\bc_\be_\bf_\bi_\bl_\be] [-\b-e\be _\be_\bs_\bc_\ba_\bp_\be_\bc_\bh_\ba_\br] [[-\b-l\bl _\bu_\bs_\be_\br] _\bh_\bo_\bs_\bt [port]]
+
+D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
+ The t\bte\bel\bln\bne\bet\bt command is used to communicate with another host using the
+ TELNET protocol. If t\bte\bel\bln\bne\bet\bt is invoked without the _\bh_\bo_\bs_\bt argument, it en-
+ ters command mode, indicated by its prompt (t\bte\bel\bln\bne\bet\bt>\b>). In this mode, it
+ accepts and executes the commands listed below. If it is invoked with
+ arguments, it performs an o\bop\bpe\ben\bn command with those arguments.
+
+ Options:
+
+ -\b-d\bd Sets the initial value of the d\bde\beb\bbu\bug\bg toggle to TRUE
+
+ -\b-a\ba Attempt automatic login. Currently, this sends the user name via
+ the USER variable of the ENVIRON option if supported by the re-
+ mote system. The name used is that of the current user as re-
+ turned by getlogin(2) if it agrees with the current user ID, oth-
+ erwise it is the name associated with the user ID.
+
+ -\b-n\bn _\bt_\br_\ba_\bc_\be_\bf_\bi_\bl_\be
+ Opens _\bt_\br_\ba_\bc_\be_\bf_\bi_\bl_\be for recording trace information. See the s\bse\bet\bt
+ t\btr\bra\bac\bce\bef\bfi\bil\ble\be command below.
+
+ -\b-l\bl _\bu_\bs_\be_\br
+ When connecting to the remote system, if the remote system under-
+ stands the ENVIRON option, then _\bu_\bs_\be_\br will be sent to the remote
+ system as the value for the variable USER. This option implies
+ the -\b-a\ba option. This option may also be used with the o\bop\bpe\ben\bn com-
+ mand.
+
+ -\b-e\be _\be_\bs_\bc_\ba_\bp_\be _\bc_\bh_\ba_\br
+ Sets the initial t\bte\bel\bln\bne\bet\bt t\bte\bel\bln\bne\bet\bt escape character to _\be_\bs_\bc_\ba_\bp_\be _\bc_\bh_\ba_\br_\b.
+ If _\be_\bs_\bc_\ba_\bp_\be _\bc_\bh_\ba_\br is ommitted, then there will be no escape charac-
+ ter.
+
+ _\bh_\bo_\bs_\bt Indicates the official name, an alias, or the Internet address of
+ a remote host.
+
+ _\bp_\bo_\br_\bt Indicates a port number (address of an application). If a number
+ is not specified, the default t\bte\bel\bln\bne\bet\bt port is used.
+
+ Once a connection has been opened, t\bte\bel\bln\bne\bet\bt will attempt to enable the
+ TELNET LINEMODE option. If this fails, then t\bte\bel\bln\bne\bet\bt 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 sys-
+ tem, under the control of the remote system. When input editing or char-
+ acter echoing is to be disabled, the remote system will relay that infor-
+ mation. The remote system will also relay changes to any special charac-
+ ters that happen on the remote system, so that they can take effect on
+ the local system.
+
+ In ``character at a time'' mode, most text typed is immediately sent to
+ the remote host for processing.
+
+ In ``old line by line'' mode, all text is echoed locally, and (normally)
+ only completed lines are sent to the remote host. The ``local echo char-
+ acter'' (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 l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs toggle is TRUE
+ (the default for ``old line by line``; see below), the user's q\bqu\bui\bit\bt, i\bin\bnt\btr\br,
+ and f\bfl\blu\bus\bsh\bh characters are trapped locally, and sent as TELNET protocol se-
+ quences to the remote side. If LINEMODE has ever been enabled, then the
+ user's s\bsu\bus\bsp\bp and e\beo\bof\bf are also sent as TELNET protocol sequences, and q\bqu\bui\bit\bt
+ is sent as a TELNET ABORT instead of BREAK There are options (see t\bto\bog\bgg\bgl\ble\be
+ a\bau\but\bto\bof\bfl\blu\bus\bsh\bh and t\bto\bog\bgg\bgl\ble\be a\bau\but\bto\bos\bsy\byn\bnc\bch\bh 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 q\bqu\bui\bit\bt
+ and i\bin\bnt\btr\br).
+
+ While connected to a remote host, t\bte\bel\bln\bne\bet\bt command mode may be entered by
+ typing the t\bte\bel\bln\bne\bet\bt ``escape character'' (initially ``^]''). When in com-
+ mand mode, the normal terminal editing conventions are available.
+
+ The following t\bte\bel\bln\bne\bet\bt commands are available. Only enough of each command
+ to uniquely identify it need be typed (this is also true for arguments to
+ the m\bmo\bod\bde\be, s\bse\bet\bt, t\bto\bog\bgg\bgl\ble\be, u\bun\bns\bse\bet\bt, s\bsl\blc\bc, e\ben\bnv\bvi\bir\bro\bon\bn, and d\bdi\bis\bsp\bpl\bla\bay\by commands).
+
+ c\bcl\blo\bos\bse\be Close a TELNET session and return to command mode.
+
+ d\bdi\bis\bsp\bpl\bla\bay\by _\ba_\br_\bg_\bu_\bm_\be_\bn_\bt _\b._\b._\b.
+ Displays all, or some, of the s\bse\bet\bt and t\bto\bog\bgg\bgl\ble\be values (see be-
+ low).
+
+ m\bmo\bod\bde\be _\bt_\by_\bp_\be _\bT_\by_\bp_\be 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 en-
+ tering that mode, the requested mode will be entered.
+
+ c\bch\bha\bar\bra\bac\bct\bte\ber\br Disable the TELNET LINEMODE option, or, if the
+ remote side does not understand the LINEMODE op-
+ tion, then enter ``character at a time`` mode.
+
+ l\bli\bin\bne\be Enable the TELNET LINEMODE option, or, if the
+ remote side does not understand the LINEMODE op-
+ tion, then attempt to enter ``old-line-by-line``
+ mode.
+
+ i\bis\bsi\big\bg (-\b-i\bis\bsi\big\bg) Attempt to enable (disable) the TRAPSIG mode of
+ the LINEMODE option. This requires that the
+ LINEMODE option be enabled.
+
+ e\bed\bdi\bit\bt (-\b-e\bed\bdi\bit\bt) Attempt to enable (disable) the EDIT mode of the
+ LINEMODE option. This requires that the
+ LINEMODE option be enabled.
+
+ s\bso\bof\bft\btt\bta\bab\bbs\bs (-\b-s\bso\bof\bft\btt\bta\bab\bbs\bs)
+ Attempt to enable (disable) the SOFT_TAB mode of
+ the LINEMODE option. This requires that the
+ LINEMODE option be enabled.
+
+ l\bli\bit\bte\bec\bch\bho\bo (-\b-l\bli\bit\bte\bec\bch\bho\bo)
+ Attempt to enable (disable) the LIT_ECHO mode of
+ the LINEMODE option. This requires that the
+ LINEMODE option be enabled.
+
+ ?\b? Prints out help information for the m\bmo\bod\bde\be com-
+ mand.
+
+ o\bop\bpe\ben\bn _\bh_\bo_\bs_\bt [[-\b-l\bl] _\bu_\bs_\be_\br][-\b-_\bp_\bo_\br_\bt]
+ Open a connection to the named host. If no port number is
+ specified, t\bte\bel\bln\bne\bet\bt will attempt to contact a TELNET server at
+ the default port. The host specification may be either a host
+ name (see hosts(5)) or an Internet address specified in the
+ ``dot notation'' (see inet(3)). The [-\b-l\bl] option may be used
+ to specify the user name to be passed to the remote system via
+ the ENVIRON option. When connecting to a non-standard port,
+ t\bte\bel\bln\bne\bet\bt omits any automatic initiation of TELNET options. When
+ the port number is preceeded by a minus sign, the inital op-
+ tion negotiation is done. After establishing a connection,
+ the file _\b._\bt_\be_\bl_\bn_\be_\bt_\br_\bc in the users home directory is opened.
+ Lines begining with a # are comment lines. Blank lines are
+ ignored. Lines that begin without whitespace are the start of
+ a machine entry. The first thing on the line is the name of
+ the machine that is being connected to. The rest of the line,
+ and successive lines that begin with whitespace are assumed to
+ be t\bte\bel\bln\bne\bet\bt commands and are processed as if they had been typed
+ in manually to the t\bte\bel\bln\bne\bet\bt command prompt.
+
+ q\bqu\bui\bit\bt Close any open TELNET session and exit t\bte\bel\bln\bne\bet\bt. An end of file
+ (in command mode) will also close a session and exit.
+
+ s\bse\ben\bnd\bd _\ba_\br_\bg_\bu_\bm_\be_\bn_\bt_\bs
+ 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):
+
+ a\bab\bbo\bor\brt\bt Sends the TELNET ABORT (Abort processes) sequence.
+
+ a\bao\bo Sends the TELNET AO (Abort Output) sequence, which
+ should cause the remote system to flush all output
+ _\bf_\br_\bo_\bm the remote system _\bt_\bo the user's terminal.
+
+ a\bay\byt\bt Sends the TELNET AYT (Are You There) sequence, to
+ which the remote system may or may not choose to re-
+ spond.
+
+ b\bbr\brk\bk Sends the TELNET BRK (Break) sequence, which may have
+ significance to the remote system.
+
+ e\bec\bc Sends the TELNET EC (Erase Character) sequence, which
+ should cause the remote system to erase the last char-
+ acter entered.
+
+ e\bel\bl Sends the TELNET EL (Erase Line) sequence, which
+ should cause the remote system to erase the line cur-
+ rently being entered.
+
+ e\beo\bof\bf Sends the TELNET EOF (End Of File) sequence.
+
+ e\beo\bor\br Sends the TELNET EOR (End of Record) sequence.
+
+ e\bes\bsc\bca\bap\bpe\be Sends the current t\bte\bel\bln\bne\bet\bt escape character (initially
+ ``^'').
+
+ g\bga\ba Sends the TELNET GA (Go Ahead) sequence, which likely
+ has no significance to the remote system.
+
+ g\bge\bet\bts\bst\bta\bat\btu\bus\bs
+ If the remote side supports the TELNET STATUS command,
+ g\bge\bet\bts\bst\bta\bat\btu\bus\bs will send the subnegotiation to request that
+ the server send its current option status.
+
+ i\bip\bp Sends the TELNET IP (Interrupt Process) sequence,
+ which should cause the remote system to abort the cur-
+ rently running process.
+
+
+ n\bno\bop\bp Sends the TELNET NOP (No OPeration) sequence.
+
+ s\bsu\bus\bsp\bp Sends the TELNET SUSP (SUSPend process) sequence.
+
+ s\bsy\byn\bnc\bch\bh 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 ur-
+ gent 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).
+
+ ?\b? Prints out help information for the s\bse\ben\bnd\bd command.
+
+ s\bse\bet\bt _\ba_\br_\bg_\bu_\bm_\be_\bn_\bt _\bv_\ba_\bl_\bu_\be
+
+ u\bun\bns\bse\bet\bt _\ba_\br_\bg_\bu_\bm_\be_\bn_\bt _\bv_\ba_\bl_\bu_\be
+ The s\bse\bet\bt command will set any one of a number of t\bte\bel\bln\bne\bet\bt vari-
+ ables to a specific value or to TRUE. The special value o\bof\bff\bf
+ turns off the function associated with the variable, this is
+ equivalent to using the u\bun\bns\bse\bet\bt command. The u\bun\bns\bse\bet\bt command will
+ disable or set to FALSE any of the specified functions. The
+ values of variables may be interrogated with the d\bdi\bis\bsp\bpl\bla\bay\by com-
+ mand. The variables which may be set or unset, but not tog-
+ gled, are listed here. In addition, any of the variables for
+ the t\bto\bog\bgg\bgl\ble\be command may be explicitly set or unset using the
+ s\bse\bet\bt and u\bun\bns\bse\bet\bt commands.
+
+ e\bec\bch\bho\bo 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 en-
+ tering, say, a password).
+
+ e\beo\bof\bf If t\bte\bel\bln\bne\bet\bt is operating in LINEMODE or ``old line by
+ line'' mode, entering this character as the first
+ character on a line will cause this character to be
+ sent to the remote system. The initial value of the
+ eof character is taken to be the terminal's e\beo\bof\bf char-
+ acter.
+
+ e\ber\bra\bas\bse\be If t\bte\bel\bln\bne\bet\bt is in l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs mode (see t\bto\bog\bgg\bgl\ble\be l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs
+ below), a\ban\bnd\bd if t\bte\bel\bln\bne\bet\bt is operating in ``character at a
+ time'' mode, then when this character is typed, a
+ TELNET EC sequence (see s\bse\ben\bnd\bd e\bec\bc above) is sent to the
+ remote system. The initial value for the erase char-
+ acter is taken to be the terminal's e\ber\bra\bas\bse\be character.
+
+ e\bes\bsc\bca\bap\bpe\be This is the t\bte\bel\bln\bne\bet\bt escape character (initially ``^['')
+ which causes entry into t\bte\bel\bln\bne\bet\bt command mode (when con-
+ nected to a remote system).
+
+ f\bfl\blu\bus\bsh\bho\bou\but\btp\bpu\but\bt
+ If t\bte\bel\bln\bne\bet\bt is in l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs mode (see t\bto\bog\bgg\bgl\ble\be l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs
+ below) and the f\bfl\blu\bus\bsh\bho\bou\but\btp\bpu\but\bt character is typed, a
+ TELNET AO sequence (see s\bse\ben\bnd\bd a\bao\bo above) is sent to the
+ remote host. The initial value for the flush charac-
+ ter is taken to be the terminal's f\bfl\blu\bus\bsh\bh character.
+
+ i\bin\bnt\bte\ber\brr\bru\bup\bpt\bt
+ If t\bte\bel\bln\bne\bet\bt is in l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs mode (see t\bto\bog\bgg\bgl\ble\be l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs
+ below) and the i\bin\bnt\bte\ber\brr\bru\bup\bpt\bt character is typed, a TELNET
+ IP sequence (see s\bse\ben\bnd\bd i\bip\bp above) is sent to the remote
+ host. The initial value for the interrupt character
+ is taken to be the terminal's i\bin\bnt\btr\br character.
+
+ k\bki\bil\bll\bl If t\bte\bel\bln\bne\bet\bt is in l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs mode (see t\bto\bog\bgg\bgl\ble\be l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs
+ below), a\ban\bnd\bd if t\bte\bel\bln\bne\bet\bt is operating in ``character at a
+ time'' mode, then when this character is typed, a
+ TELNET EL sequence (see s\bse\ben\bnd\bd e\bel\bl above) is sent to the
+ remote system. The initial value for the kill charac-
+ ter is taken to be the terminal's k\bki\bil\bll\bl character.
+
+ l\bln\bne\bex\bxt\bt If t\bte\bel\bln\bne\bet\bt is operating in LINEMODE or ``old line by
+ line`` mode, then this character is taken to be the
+ terminal's l\bln\bne\bex\bxt\bt character. The initial value for the
+ lnext character is taken to be the terminal's l\bln\bne\bex\bxt\bt
+ character.
+
+ q\bqu\bui\bit\bt If t\bte\bel\bln\bne\bet\bt is in l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs mode (see t\bto\bog\bgg\bgl\ble\be l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs
+ below) and the q\bqu\bui\bit\bt character is typed, a TELNET BRK
+ sequence (see s\bse\ben\bnd\bd b\bbr\brk\bk above) is sent to the remote
+ host. The initial value for the quit character is
+ taken to be the terminal's q\bqu\bui\bit\bt character.
+
+ r\bre\bep\bpr\bri\bin\bnt\bt
+ If t\bte\bel\bln\bne\bet\bt is operating in LINEMODE or ``old line by
+ line`` mode, then this character is taken to be the
+ terminal's r\bre\bep\bpr\bri\bin\bnt\bt character. The initial value for
+ the reprint character is taken to be the terminal's
+ r\bre\bep\bpr\bri\bin\bnt\bt character.
+
+ s\bst\bta\bar\brt\bt If the TELNET TOGGLE-FLOW-CONTROL option has been en-
+ abled, then this character is taken to be the termi-
+ nal's s\bst\bta\bar\brt\bt character. The initial value for the kill
+ character is taken to be the terminal's s\bst\bta\bar\brt\bt charac-
+ ter.
+
+ s\bst\bto\bop\bp If the TELNET TOGGLE-FLOW-CONTROL option has been en-
+ abled, then this character is taken to be the termi-
+ nal's s\bst\bto\bop\bp character. The initial value for the kill
+ character is taken to be the terminal's s\bst\bto\bop\bp charac-
+ ter.
+
+ s\bsu\bus\bsp\bp If t\bte\bel\bln\bne\bet\bt is in l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs mode, or LINEMODE is en-
+ abled, and the s\bsu\bus\bsp\bpe\ben\bnd\bd character is typed, a TELNET
+ SUSP sequence (see s\bse\ben\bnd\bd s\bsu\bus\bsp\bp above) is sent to the re-
+ mote host. The initial value for the suspend charac-
+ ter is taken to be the terminal's s\bsu\bus\bsp\bpe\ben\bnd\bd character.
+
+ t\btr\bra\bac\bce\bef\bfi\bil\ble\be
+ Thi is the file to which the output, caused by n\bne\bet\btd\bda\bat\bta\ba
+ or o\bop\bpt\bti\bio\bon\bn tracing being TRUE, will be written. If it
+ is set to ``-\b-'', then tracing information will be
+ written to standard output (the default).
+
+ w\bwo\bor\brd\bde\ber\bra\bas\bse\be
+ If t\bte\bel\bln\bne\bet\bt is operating in LINEMODE or ``old line by
+ line`` mode, then this character is taken to be the
+ terminal's w\bwo\bor\brd\bde\ber\bra\bas\bse\be character. The initial value for
+ the worderase character is taken to be the terminal's
+ w\bwo\bor\brd\bde\ber\bra\bas\bse\be character.
+
+ ?\b? Displays the legal s\bse\bet\bt (u\bun\bns\bse\bet\bt) commands.
+
+ s\bsl\blc\bc _\bs_\bt_\ba_\bt_\be The s\bsl\blc\bc 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
+ i\bip\bp or q\bqu\bui\bit\bt) or line editing characters (like e\ber\bra\bas\bse\be and k\bki\bil\bll\bl).
+ By default, the local special characters are exported.
+
+ e\bex\bxp\bpo\bor\brt\bt Switch to the local defaults for the special char-
+ acters. The local default characters are those of
+ the local terminal at the time when t\bte\bel\bln\bne\bet\bt was
+ started.
+
+ i\bim\bmp\bpo\bor\brt\bt 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.
+
+ c\bch\bhe\bec\bck\bk 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 discrepencies with the local
+ side, the local side will switch to the remote
+ value.
+
+ ?\b? Prints out help information for the s\bsl\blc\bc command.
+
+ e\ben\bnv\bvi\bir\bro\bon\bn _\ba_\br_\bg_\bu_\bm_\be_\bn_\bt_\bs_\b._\b._\b.
+ The e\ben\bnv\bvi\bir\bro\bon\bn command is used to manipulate the the variables
+ that my be sent through the TELNET ENVIRON option. The ini-
+ tial 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\ba or -\b-l\bl
+ options are used.
+ Valid arguments for the e\ben\bnv\bvi\bir\bro\bon\bn command are:
+
+ d\bde\bef\bfi\bin\bne\be _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be _\bv_\ba_\bl_\bu_\be
+ Define the variable _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be to have a value of
+ _\bv_\ba_\bl_\bu_\be_\b. Any variables defined by this command are
+ automatically exported. The _\bv_\ba_\bl_\bu_\be may be enclosed
+ in single or double quotes so that tabs and spaces
+ may be included.
+
+ u\bun\bnd\bde\bef\bfi\bin\bne\be _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be
+ Remove _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be from the list of environment vari-
+ ables.
+
+ e\bex\bxp\bpo\bor\brt\bt _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be
+ Mark the variable _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be to be exported to the
+ remote side.
+
+ u\bun\bne\bex\bxp\bpo\bor\brt\bt _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be
+ Mark the variable _\bv_\ba_\br_\bi_\ba_\bb_\bl_\be to not be exported un-
+ less explicitly asked for by the remote side.
+
+ l\bli\bis\bst\bt List the current set of environment variables.
+ Those marked with a *\b* will be sent automatically,
+ other variables will only be sent if explicitly
+ requested.
+
+ ?\b? Prints out help information for the e\ben\bnv\bvi\bir\bro\bon\bn com-
+ mand.
+
+ t\bto\bog\bgg\bgl\ble\be _\ba_\br_\bg_\bu_\bm_\be_\bn_\bt_\bs _\b._\b._\b.
+ Toggle (between TRUE and FALSE) various flags that control how
+ t\bte\bel\bln\bne\bet\bt responds to events. These flags may be set explicitly
+ to TRUE or FALSE using the s\bse\bet\bt and u\bun\bns\bse\bet\bt commands listed
+ above. More than one argument may be specified. The state of
+ these flags may be interrogated with the d\bdi\bis\bsp\bpl\bla\bay\by command.
+ Valid arguments are:
+
+ a\bau\but\bto\bof\bfl\blu\bus\bsh\bh If a\bau\but\bto\bof\bfl\blu\bus\bsh\bh and l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs are both TRUE, then
+ when the a\bao\bo, or q\bqu\bui\bit\bt characters are recognized
+ (and transformed into TELNET sequences; see s\bse\bet\bt
+ above for details), t\bte\bel\bln\bne\bet\bt 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 se-
+ quences. The initial value for this toggle is
+ TRUE if the terminal user had not done an "stty
+ noflsh", otherwise FALSE (see stty(1)).
+
+ a\bau\but\bto\bos\bsy\byn\bnc\bch\bh If a\bau\but\bto\bos\bsy\byn\bnc\bch\bh and l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs are both TRUE, then
+ when either the i\bin\bnt\btr\br or q\bqu\bui\bit\bt characters is typed
+ (see s\bse\bet\bt above for descriptions of the i\bin\bnt\btr\br and
+ q\bqu\bui\bit\bt characters), the resulting TELNET sequence
+ sent is followed by the TELNET SYNCH sequence.
+ This procedure s\bsh\bho\bou\bul\bld\bd 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\bbi\bin\bna\bar\bry\by Enable or disable the TELNET BINARY option on
+ both input and output.
+
+ i\bin\bnb\bbi\bin\bna\bar\bry\by Enable or disable the TELNET BINARY option on
+ input.
+
+ o\bou\but\btb\bbi\bin\bna\bar\bry\by Enable or disable the TELNET BINARY option on
+ output.
+
+ c\bcr\brl\blf\bf If this is TRUE, then carriage returns will be
+ sent as <CR><LF>. If this is FALSE, then car-
+ riage returns will be send as <CR><NUL>. The
+ initial value for this toggle is FALSE.
+
+ c\bcr\brm\bmo\bod\bd Toggle carriage return mode. When this mode is
+ enabled, most carriage return characters re-
+ ceived 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 nev-
+ er line feed. The initial value for this toggle
+ is FALSE.
+
+ d\bde\beb\bbu\bug\bg Toggles socket level debugging (useful only to
+ the s\bsu\bup\bpe\ber\br u\bus\bse\ber\br). The initial value for this tog-
+ gle is FALSE.
+
+ l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs If this is TRUE, then the f\bfl\blu\bus\bsh\bh, i\bin\bnt\bte\ber\brr\bru\bup\bpt\bt,
+ q\bqu\bui\bit\bt, e\ber\bra\bas\bse\be, and k\bki\bil\bll\bl characters (see s\bse\bet\bt above)
+ are recognized locally, and transformed into
+ (hopefully) appropriate TELNET control sequences
+ (respectively a\bao\bo, i\bip\bp, b\bbr\brk\bk, e\bec\bc, and e\bel\bl; see s\bse\ben\bnd\bd
+ above). The initial value for this toggle is
+ TRUE in ``old line by line'' mode, and FALSE in
+ ``character at a time'' mode. When the LINEMODE
+ option is enabled, the value of l\blo\boc\bca\bal\blc\bch\bha\bar\brs\bs is
+ ignored, and assumed to always be TRUE. If
+ LINEMODE has ever been enabled, then q\bqu\bui\bit\bt is
+ sent as a\bab\bbo\bor\brt\bt, and e\beo\bof\bf a\ban\bnd\bd are sent as e\beo\bof\bf a\ban\bnd\bd
+ s\bsu\bus\bsp\bp, see s\bse\ben\bnd\bd above).
+
+ n\bne\bet\btd\bda\bat\bta\ba Toggles the display of all network data (in hex-
+ adecimal format). The initial value for this
+ toggle is FALSE.
+
+ o\bop\bpt\bti\bio\bon\bns\bs Toggles the display of some internal t\bte\bel\bln\bne\bet\bt pro-
+ tocol processing (having to do with TELNET op-
+ tions). The initial value for this toggle is
+ FALSE.
+
+ p\bpr\bre\bet\btt\bty\byd\bdu\bum\bmp\bp When the n\bne\bet\btd\bda\bat\bta\ba toggle is enabled, if
+ p\bpr\bre\bet\btt\bty\byd\bdu\bum\bmp\bp is enabled the output from the
+ n\bne\bet\btd\bda\bat\bta\ba command will be formated in a more user
+ readable format. Spaces are put between each
+ character in the output, and the begining of any
+ TELNET escape sequence is preceeded by a '*' to
+ aid in locating them.
+
+ ?\b? Displays the legal t\bto\bog\bgg\bgl\ble\be commands.
+
+ z\bz Suspend t\bte\bel\bln\bne\bet\bt. This command only works when the user is using
+ the csh(1).
+
+ !\b! [_\bc_\bo_\bm_\bm_\ba_\bn_\bd]
+ Execute a single command in a subshell on the local system.
+ If c\bco\bom\bmm\bma\ban\bnd\bd is ommitted, then an interactive subshell is in-
+ voked.
+
+ s\bst\bta\bat\btu\bus\bs Show the current status of t\bte\bel\bln\bne\bet\bt. This includes the peer one
+ is connected to, as well as the current mode.
+
+ ?\b? [_\bc_\bo_\bm_\bm_\ba_\bn_\bd]
+ Get help. With no arguments, t\bte\bel\bln\bne\bet\bt prints a help summary.
+ If a command is specified, t\bte\bel\bln\bne\bet\bt will print the help informa-
+ tion for just that command.
+
+E\bEN\bNV\bVI\bIR\bRO\bON\bNM\bME\bEN\bNT\bT
+ T\bTe\bel\bln\bne\bet\bt uses at least the HOME, SHELL, DISPLAY, and TERM environent vari-
+ ables. Other envirnoment variables may be propogated to the other side
+ via the TELNET ENVIRON option.
+
+F\bFI\bIL\bLE\bES\bS
+ ~/.telnetrc user customized telnet startup values
+
+H\bHI\bIS\bST\bTO\bOR\bRY\bY
+ The T\bTe\bel\bln\bne\bet\bt command appeared in 4.2BSD.
+
+N\bNO\bOT\bTE\bES\bS
+ 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 e\beo\bof\bf character is
+ only recognized (and sent to the remote system) when it is the first
+ character on a line.
+
+4.2 Berkeley Distribution June 6, 1993 8
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