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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | DIAGNOSTICS | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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
pcp@groups.io. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2020-08-13. (At that time, the date of the most recent commit that
was found in the repository was 2020-08-11.) 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
man-pages@man7.org
Performance Co-Pilot PCP TELNET-PROBE(1)