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
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.
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
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to firstname.lastname@example.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2021-04-01.
(At that time, the date of the most recent commit that was found
in the repository was 2021-04-01.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Performance Co-Pilot PCP TELNET-PROBE(1)