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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | DIAGNOSTICS | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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TELNET-PROBE(1) General Commands Manual TELNET-PROBE(1)
telnet-probe - lightweight telnet-like port probe
$PCP_BINADM_DIR/telnet-probe [-cv?] host port
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.
The available command line options are:
-c Connect only, do not read or write.
-v Enable verbose mode.
-? Display usage message and exit.
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.
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).
PCPIntro(1), pmdashping(1), pmie(1), telnet(1), connect(2),
read(2) and write(2).
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 [email protected]. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-11.) 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
[email protected]
Performance Co-Pilot PCP TELNET-PROBE(1)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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