CRON(1M)                                                 CRON(1M)



     NAME
          cron - clock daemon

     SYNOPSIS
          /etc/cron

     DESCRIPTION
          cron executes commands at specified dates and times.
          Regularly scheduled commands can be specified according to
          instructions found in crontab files in the directory
          /usr/spool/cron/crontabs.  Users can submit their own
          crontab file via the crontab(1) command.  Commands which are
          to be executed only once may be submitted via the at(1)
          command.

          cron only examines crontab files and at command files during
          process initialization and when a file changes via crontab
          or at.  This reduces the overhead of checking for new or
          changed files at regularly scheduled intervals.

          Since cron never exits, it should be executed only once.
          This is done routinely through /etc/rc2.d/S75cron at system
          boot time.  /usr/lib/cron/FIFO is used as a lock file to
          prevent the execution of more than one cron.

     FILES
          /usr/lib/cron        main cron directory
          /usr/lib/cron/FIFO   used as a lock file
          /usr/lib/cron/log    accounting information
          /usr/spool/cron      spool area

     SEE ALSO
          at(1), crontab(1), sh(1) in the User's Reference Manual.

     DIAGNOSTICS
          A history of all actions taken by cron are recorded in
          /usr/lib/cron/log.

     ORIGIN
          AT&T V.3















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