telnet-probe(1) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | DIAGNOSTICS | PCP ENVIRONMENT | SEE ALSO | COLOPHON

TELNET-PROBE(1)          General Commands Manual         TELNET-PROBE(1)

NAME         top

       telnet-probe - lightweight telnet-like port probe

SYNOPSIS         top

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

DESCRIPTION         top

       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         top

       The available command line options are:

       -c   Connect only, do not read or write.

       -v   Enable verbose mode.

       -?   Display usage message and exit.

DIAGNOSTICS         top

       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         top

       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         top

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

COLOPHON         top

       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 2020-12-18.
       (At that time, the date of the most recent commit that was found
       in the repository was 2020-12-18.)  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)