Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
CRON(8)			    System Manager's Manual		       CRON(8)

NAME
       cron - daemon to	execute	scheduled commands (Vixie Cron)

SYNOPSIS
       cron

DESCRIPTION
       Cron  should  be	started	from /etc/rc or	/etc/rc.local.	It will	return
       immediately, so you don't need to start it with '&'.

       Cron searches /var/spool/cron for crontab files which are  named	 after
       accounts	 in  /etc/passwd; crontabs found are loaded into memory.  Cron
       also searches for /etc/crontab and the files in the /etc/cron.d/	direc-
       tory,  which  are  in  a	 different format (see crontab(5)).  Cron then
       wakes up	every minute, examining	all  stored  crontabs,	checking  each
       command to see if it should be run in the current minute.  When execut-
       ing commands, any output	is mailed to the owner of the crontab  (or  to
       the  user  named	 in the	MAILTO environment variable in the crontab, if
       such exists).

       Additionally, cron checks each minute to	see if its  spool  directory's
       modtime	(or  the  modtime on /etc/crontab) has changed,	and if it has,
       cron will then examine the modtime on all  crontabs  and	 reload	 those
       which have changed.  Thus cron need not be restarted whenever a crontab
       file is modified.  Note that the	Crontab(1) command updates the modtime
       of the spool directory whenever it changes a crontab.

SEE ALSO
       crontab(1), crontab(5)

AUTHOR
       Paul Vixie <paul@vix.com>

4th Berkeley Distribution      20 December 1993			       CRON(8)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHOR

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=cron&sektion=8&manpath=Red+Hat+9>

home | help