NAME

       telnet-probe - lightweight telnet-like port probe

SYNOPSIS

       $PCP_BINADM_DIR/telnet-probe [-cv?]  host port

DESCRIPTION

       telnet-probe  allows the pmdashping(1) daemons to establish connections to arbitrary local
       and remote service-providing daemons  so  that  response  time  and  service  availability
       information can be obtained.

       The  required  host  and  port  number  arguments have the same meaning as their telnet(1)
       equivalents.

       The -c option causes telnet-probe to perform a connect(2) only.  This  skips  the  read(2)
       and write(2) exercise that would otherwise be done after connecting (see below).

       Once  the telnet connection has been established, telnet-probe reads from stdin until end-
       of-file, and writes all the input data to the telnet connection.  Next, telnet-probe  will
       read  from  the telnet connection until end-of-file, discarding whatever data it receives.
       Then telnet-probe exits.

       To operate successfully, the input passed via telnet-probe to the remote service  must  be
       sufficient to cause the remote service to close the connection when the last line of input
       has been processed, e.g. ending with ``quit'' when probing SMTP on port 25.

       By default telnet-probe will not produce any output, unless there is  an  error  in  which
       case a diagnostic message can be displayed (in verbose mode only) and the exit status will
       be non-zero indicating a failure.

OPTIONS

       The available command line options are:

       -c   Connect only, do not read or write.

       -v   Enable verbose mode.

       -?   Display usage message and exit.

DIAGNOSTICS

       If telnet-probe succeeds, then 0  will  be  returned.   If  the  attempt  to  establish  a
       connection fails or is terminated, then a non-zero exit status is returned.

PCP ENVIRONMENT

       Environment variables with the prefix PCP_ are used to parameterize the file and directory
       names used by PCP.  On each installation, the file /etc/pcp.conf contains the local values
       for  these  variables.   The  $PCP_CONF  variable  may  be  used to specify an alternative
       configuration file, as described in pcp.conf(5).

SEE ALSO

       PCPIntro(1), pmdashping(1), pmie(1), telnet(1), connect(2), read(2) and write(2).