CRON(C)                              UNIX System V



     Name
          cron - executes commands scheduled by at, batch, and crontab


     Syntax
          /etc/cron


     Description
          cron is the clock daemon that executes commands at specified
          dates  and times.  cron processes jobs submitted with at(C),
          batch(C),  and  crontab(C).   cron  never  exits;  the  cron
          command  usually  appears  in  the  /etc/rc2  scripts  to be
          invoked by init(M) when the system is brought up  in  multi-
          user mode.


     Files
          /etc/default/cron        cron logging default information

          /usr/lib/cron            main cron directory

          /usr/lib/cron/atjobs     at directory

          /usr/spool/cron/crontabs crontab directory

          /usr/lib/cron/log        accounting information

          /usr/lib/cron/queuedefs
                                   cron data file

          /usr/lib/cron/.proto     cron environment information


     See Also
          at(C), crontab(C), queuedefs(F), sh(C)


     Diagnostics
          A history  of  all  actions  by  cron  can  be  recorded  in
          /usr/lib/cron/log.  This logging occurs only if the variable
          CRONLOG is set to YES in /etc/default/cron.  By default this
          value is set to NO and no logging occurs.  If logging should
          be turned on, be sure to check the  size  of  the  log  file
          regularly.


     Standards Conformance
          cron is conformant with:
          AT&T SVID Issue 2, Select Code 307-127.


     (printed 2/15/90)                                    CRON(C)