<history-file-checker.pl> script documentation

1. Introduction:
   This is a back-up version of history-file-checker-rhodes.pl. It runs on the HEAD LAN (on xcanuck) via CRON by 'acisdude'. It checks the timestamp of the last row in the focal plane history file, FPHIST-2001.dat, located in /proj/sot/acis/FLU-MON/
   
   history-file-checker.pl is a simple perl script to check that all the HISTORY files, produced by acis-backstop.pl, have been populated with the latest information from the weekly load. It uses the focal plane history file, FPHIST-2001.dat (located in /proj/sot/acis/FLU-MON/), as a proxy for all the history files. The script reads the time value corresponding to the last row in this file and determines the current time (at run-time; script is executed by CRON at the top of the hour, every hour) via the UNIX command 'date'. If the time difference between the last row in the focal plane history file and the current time is less than 2.0 days, the script spawns email alerts to 'acisdude' and suggests that ACE-update.ksh has not been run yet.
2. Execution dependencies:
   Run via CRON at the top of the hour, every hour by 'acisdude' on the machine 'xcanuck'.
3. Script dependencies:
   

   Scripts used by history-file-checker.pl

   none

   Scripts that depend on the outputs

   none

   File dependencies:
   

   Input files:

   none

   Output files:

   none

4. Code Location and execution
5. Problems and Issues
6. Notes