NAME
telnet-probe - lightweight telnet-like port probe
SYNOPSIS
$PCP_BINADM_DIR/telnet-probe [-v] host port
DESCRIPTION
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 -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.
PCP ENVIRONMENT
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(4).
DIAGNOSTICS
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.
SEE ALSO
PCPintro(1), pmdashping(1), pmie(1) and telnet(1).