cron(C)                         19 June 1992                         cron(C)


 Name

    cron - execute commands scheduled by at, batch, and crontab

 Syntax

    /etc/cron

 Description

    The cron command 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), sg(C), 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 is turned on, be sure to check the size of the log
    file regularly.

 Notes

    cron will set the supplemental group list to that of the user requesting
    the job.

 Standards conformance

    cron is conformant with AT&T SVID Issue 2.