Station Cron Scripts
The offline cron jobs are a fairly simple, but important part
of the automatic station operations.
Principles of Operation
The cron jobs are all written in a similar manner to allow
easier problem diagnostis. All cron scripts are run from the
workstation "sadira" as user "ovlbi". Below the cron scripts
are listed with a summary and schedule for execution.
- Every night at 1 am, the previous days logs are merged to
produce a single days logs.
- Every morning at 7 am the previous days logs are checked
and a pass Summary produced.
- Every morning at 7 am the previous days logs are checked for
- Every hour, the FTP site at
ISAS in Japan is checked for new schedule files.
- Every three hours, the FTP site at JPL in California
is checked for new satelite predictions.
- Every 15 minutes, the latest log file is examined for
new telemetry header data. If any is found, it is placed
in the ovlbi output FTP area.
Both the space radio telescope schedule files and satellite orbit prediction
files are retrieved automatically by cron jobs. The orbit prediction files
are automatically processed by the cron job into a form that can be used
The schedule file is processed into a comamnd file using the schedco program.
The command file must be started by an operator.
Three log processing tasks are handled automatically by programs
run from cron jobs.
At the end of every day, the 96 logs from the previous day
are merged to produce a single log file for that day.
The script "mergeLogs" runs a program "logMerge", and writes
a summary to a file in directory "~ovlbi/offline/scriptFiles".
After the logs are merged, the tracking activities and problems
are reported in a summary e-mailed to the station staff.
The script "dailySummary" runs the program "passSummary".
The daily summary file is also written to the directory
Also after the logs are merge, a summary is produced
of all anomalous station
conditions detected by the realtime MONCHK task.
The summary is e-mailed to the station staff.
The satellite telemetry headers are extracted from the
15 minute length realtime logs by script "vsopTelemetry", which
is run every 15 minutes.
The telemetry header files are placed in the OVLBI output ftp area.
Eventually, more output data files will be generated automatically.
Return to the Station Software Guide.
The National Radio Astronomy Observatory
is a facillity of the
National Science Foundation
operated under cooperative agreement by
Associated Universities, Inc.
firstname.lastname@example.org Last update: 97 June 24