CentOS 7.0 - man page for telnet-probe (centos section 1)
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telnet-probe - lightweight telnet-like port probe
$PCP_BINADM_DIR/telnet-probe [-c] [-v] 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 infor-
mation can be obtained.
The required host and port number arguments have the same meaning as their telnet(1)
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.
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 config-
uration file, as described in pcp.conf(5).
If telnet-probe succeeds, then 0 will be returned. If the attempt to establish a connec-
tion fails or is terminated, then a non-zero exit status is returned.
PCPintro(1), pmdashping(1), pmie(1), telnet(1), connect(2), read(2) and write(2).
Performance Co-Pilot PCP TELNET-PROBE(1)
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