xenial (1) telnet-probe.1.gz

NAME

       telnet-probe - lightweight telnet-like port probe

SYNOPSIS

       $PCP_BINADM_DIR/telnet-probe [-c] [-v] 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).

       The -v option causes telnet-probe to be verbose while operating.

       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.

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).

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.

SEE ALSO

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