cron man page on Cygwin

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CRON(8)								       CRON(8)

NAME
       cron - daemon to execute scheduled commands (ISC Cron V4.1)

SYNOPSIS
       cron [-l load_avg] [-n]

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	'&'.   The  -n	option
       changes	this  default  behavior	 causing  it to run in the foreground.
       This can be useful when starting it out of init.

       Cron searches /var/cron/tabs 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.

   Daylight Saving Time and other time changes
       Local  time  changes  of less than three hours, such as those caused by
       the start or end of Daylight Saving Time, are handled specially.	  This
       only  applies to jobs that run at a specific time and jobs that are run
       with a granularity greater than one hour.   Jobs	 that  run  more  fre‐
       quently are scheduled normally.

       If time has moved forward, those jobs that would have run in the inter‐
       val that has been skipped will be run immediately.  Conversely, if time
       has moved backward, care is taken to avoid running jobs twice.

       Time  changes  of more than 3 hours are considered to be corrections to
       the clock or timezone, and the new time is used immediately.

SIGNALS
       On receipt of a SIGHUP, the cron daemon will close and reopen  its  log
       file.  This is useful in scripts which rotate and age log files.	 Natu‐
       rally this is not relevant if cron was built to use syslog(3).

CAVEATS
       In this version of cron, /etc/crontab must not be writable by any  user
       other  than  root.   Crontab files must be non executable regular files
       writable only by their owner.

SEE ALSO
       crontab(1), crontab(5)

AUTHOR
       Paul Vixie <vixie@isc.org>

4th Berkeley Distribution      10 January 1996"			       CRON(8)
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