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tip - connect to a remote system

 

NAME

      tip - connect to a remote system
 

SYNOPSIS

      tip [-v] -speed system-name
      tip [-v] -speed phone-number
 

DESCRIPTION

      The tip command establishes a full-duplex connection to another machine,
      giving the appearance of being logged in directly on the remote cpu.  It
      goes without saying that you must have a login on the machine (or equiva‐
      lent) to which you wish to connect.
 
      Available Option:
 
      -v      Set verbose mode.
 
      Typed characters are normally transmitted directly to the remote machine
      (which does the echoing as well).  A tilde (‘~’) appearing as the first
      character of a line is an escape signal; the following are recognized:
 
      ~^D or ~.
            Drop the connection and exit (you may still be logged in on the
            remote machine).
 
      ~c [name]
            Change directory to name (no argument implies change to your home
            directory).
 
      ~!    Escape to a shell (exiting the shell will return you to tip).
 
      ~>    Copy file from local to remote.  The tip utility prompts for the
            name of a local file to transmit.
 
      ~<    Copy file from remote to local.  The tip utility prompts first for
            the name of the file to be sent, then for a command to be executed
            on the remote machine.
 
      ~p from [to]
            Send a file to a remote UNIX host.  The put command causes the
            remote UNIX system to run the command string ‘‘cat > ’to’’’, while
            tip sends it the ‘‘from’’ file.  If the ‘‘to’’ file isn’t specified
            the ‘‘from’’ file name is used.  This command is actually a UNIX
            specific version of the ‘‘~>’’ command.
 
      ~t from [to]
            Take a file from a remote UNIX host.  As in the put command the
            ‘‘to’’ file defaults to the ‘‘from’’ file name if it isn’t speci‐
            fied.  The remote host executes the command string ‘‘cat
            ’from’;echo ^A’’ to send the file to tip.
 
      ~|    Pipe the output from a remote command to a local UNIX process.  The
            command string sent to the local UNIX system is processed by the
            shell.
 
      ~$    Pipe the output from a local UNIX process to the remote host.  The
            command string sent to the local UNIX system is processed by the
            shell.
 
      ~C    Fork a child process on the local system to perform special proto‐
            cols such as XMODEM.  The child program will be run with the fol‐
            lowing somewhat unusual arrangement of file descriptors:
                  0 <-> local tty in
                  1 <-> local tty out
                  2 <-> local tty out
                  3 <-> remote tty in
                  4 <-> remote tty out
 
      ~#    Send a BREAK to the remote system.  For systems which don’t support
            the necessary ioctl call the break is simulated by a sequence of
            line speed changes and DEL characters.
 
      ~s    Set a variable (see the discussion below).
 
      ~^Z   Stop tip (only available with job control).
 
      ~^Y   Stop only the ‘‘local side’’ of tip (only available with job con‐
            trol); the ‘‘remote side’’ of tip, the side that displays output
            from the remote host, is left running.
 
      ~?    Get a summary of the tilde escapes
 
      The tip utility uses the file /etc/remote to find how to reach a particu‐
      lar system and to find out how it should operate while talking to the
      system; refer to remote(5) for a full description.  Each system has a
      default baud rate with which to establish a connection.  If this value is
      not suitable, the baud rate to be used may be specified on the command
      line, e.g. ‘tip -300 mds’.
 
      When tip establishes a connection it sends out a connection message to
      the remote system; the default value, if any, is defined in /etc/remote
      (see remote(5)).
 
      When tip prompts for an argument (e.g. during setup of a file transfer)
      the line typed may be edited with the standard erase and kill characters.
      A null line in response to a prompt, or an interrupt, will abort the dia‐
      logue and return you to the remote machine.
 
      The tip utility guards against multiple users connecting to a remote sys‐
      tem by opening modems and terminal lines with exclusive access, and by
      honoring the locking protocol used by uucico(8).
 
      During file transfers tip provides a running count of the number of lines
      transferred.  When using the ~> and ~< commands, the ‘‘eofread’’ and
      ‘‘eofwrite’’ variables are used to recognize end-of-file when reading,
      and specify end-of-file when writing (see below).  File transfers nor‐
      mally depend on tandem mode for flow control.  If the remote system does
      not support tandem mode, ‘‘echocheck’’ may be set to indicate tip should
      synchronize with the remote system on the echo of each transmitted char‐
      acter.
 
      When tip must dial a phone number to connect to a system it will print
      various messages indicating its actions.  The tip utility supports modems
      that use the AT command set.  The tip utility uses the file /etc/modems
      to find out how to operate with a particular modem; refer to modems(5)
      for a full description.
 
    VARIABLES
      The tip utility maintains a set of variables which control its operation.
      Some of these variables are read-only to normal users (root is allowed to
      change anything of interest).  Variables may be displayed and set through
      the ‘‘s’’ escape.  The syntax for variables is patterned after vi(1) and
      Mail(1).  Supplying ‘‘all’’ as an argument to the set command displays
      all variables readable by the user.  Alternatively, the user may request
      display of a particular variable by attaching a ‘?’ to the end.  For
      example ‘‘escape?’’  displays the current escape character.
 
      Variables are numeric, string, character, or boolean values.  Boolean
      variables are set merely by specifying their name; they may be reset by
      prepending a ‘!’ to the name.  Other variable types are set by concate‐
      nating an ‘=’ and the value.  The entire assignment must not have any
      blanks in it.  A single set command may be used to interrogate as well as
      set a number of variables.  Variables may be initialized at run time by
      placing set commands (without the ‘‘~s’’ prefix in a file .tiprc in one’s
      home directory).  The -v option causes tip to display the sets as they
      are made.  Certain common variables have abbreviations.  The following is
      a list of common variables, their abbreviations, and their default val‐
      ues.
 
      beautify      (bool) Discard unprintable characters when a session is
                    being scripted; abbreviated be.
 
      baudrate      (num) The baud rate at which the connection was estab‐
                    lished; abbreviated ba.
 
      chardelay     (num) Number of milliseconds to delay after the transmis‐
                    sion of each character; abbreviated cdelay.
 
      dialtimeout   (num) When dialing a phone number, the time (in seconds) to
                    wait for a connection to be established; abbreviated dial.
 
      echocheck     (bool) Synchronize with the remote host during file trans‐
                    fer by waiting for the echo of the last character transmit‐
                    ted; default is off.
 
      eofread       (str) The set of characters which signify an end-of-trans‐
                    mission during a ~< file transfer command; abbreviated
                    eofr.
 
      eofwrite      (str) The string sent to indicate end-of-transmission dur‐
                    ing a ~> file transfer command; abbreviated eofw.
 
      eol           (str) The set of characters which indicate an end-of-line.
                    The tip utility will recognize escape characters only after
                    an end-of-line.
 
      escape        (char) The command prefix (escape) character; abbreviated
                    es; default value is ‘~’.
 
      exceptions    (str) The set of characters which should not be discarded
                    due to the beautification switch; abbreviated ex; default
                    value is ‘‘\t\n\f\b’’.
 
      force         (char) The character used to force literal data transmis‐
                    sion; abbreviated fo; default value is ‘^P’.
 
      framesize     (num) The amount of data (in bytes) to buffer between file
                    system writes when receiving files; abbreviated fr.
 
      host          (str) The name of the host to which you are connected;
                    abbreviated ho.
 
      linedelay     (num) Number of milliseconds to delay after the transmis‐
                    sion of each line; abbreviated ldelay.
 
      login         (str) Pathname of a login shell script to run once con‐
                    nected; standard input and output are redirected to the
                    remote host.  Leading tildes in the pathname are expanded
                    expansion; abbreviated li.
 
      logout        (str) Pathname of a shell script to run before disconnect‐
                    ing; standard input and output are redirected to the remote
                    host.  Leading tildes in the pathname are expanded expan‐
                    sion; abbreviated lo.
 
      prompt        (char) The character which indicates an end-of-line on the
                    remote host; abbreviated pr; default value is ‘\n’.  This
                    value is used to synchronize during data transfers.  The
                    count of lines transferred during a file transfer command
                    is based on receipt of this character.
 
      raise         (bool) Upper case mapping mode; abbreviated ra; default
                    value is off.  When this mode is enabled, all lower case
                    letters will be mapped to upper case by tip for transmis‐
                    sion to the remote machine.
 
      raisechar     (char) The input character used to toggle upper case map‐
                    ping mode; abbreviated rc; default value is ‘^A’.
 
      record        (str) The name of the file in which a session script is
                    recorded; abbreviated rec; default value is ‘‘tip.record’’.
 
      script        (bool) Session scripting mode; abbreviated sc; default is
                    off.  When script is true, tip will record everything
                    transmitted by the remote machine in the script record file
                    specified in record.  If the beautify switch is on, only
                    printable ASCII characters will be included in the script
                    file (those characters between 040 and 0177).  The variable
                    exceptions is used to indicate characters which are an
                    exception to the normal beautification rules.
 
      tabexpand     (bool) Expand tabs to spaces during file transfers; abbre‐
                    viated tab; default value is false.  Each tab is expanded
                    to 8 spaces.
 
      verbose       (bool) Verbose mode; abbreviated verb; default is true.
                    When verbose mode is enabled, tip prints messages while
                    dialing, shows the current number of lines transferred dur‐
                    ing a file transfer operations, and more.
 

ENVIRONMENT

      The tip utility uses the following environment variables:
 
      SHELL       (str) The name of the shell to use for the ~! command;
                  default value is ‘‘/bin/sh’’, or taken from the environment.
 
      HOME        (str) The home directory to use for the ~c command; default
                  value is taken from the environment.
 
      HOST        Check for a default host if none specified.
 
      The variables ${REMOTE} and ${PHONES} are also exported.
 

FILES

      /etc/modems             Global modem configuration data base.
      /etc/remote             Global system descriptions.
      /etc/phones             Global phone number data base.
      ${REMOTE}               Private system descriptions.
      ${PHONES}               Private phone numbers.
      ~/.tiprc                Initialization file.
      tip.record              Record file.
      /var/log/aculog         Line access log.
      /var/spool/lock/LCK..*  Lock file to avoid conflicts with uucp(1).
 

DIAGNOSTICS

      Diagnostics are, hopefully, self explanatory.
      cu(1), phones(5), remote(5)
 

HISTORY

      The tip command appeared in 4.2BSD.
 

BUGS

      The full set of variables is undocumented and should, probably, be pared
      down.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.