Fcron should be started from /etc/rc or
/etc/rc.local. Unless the -f (or
--foreground) option is given, it will return immediately, so
you don't need to start it with '&'.
Fcron loads users fcrontabs (see fcrontab(5)) files previously installed by
fcrontab (see fcrontab(1)). Then, fcron calculates the time
and date of each job's next execution, and determines how long it has to sleep,
and sleeps for this amount of time. When it wakes up, it checks all jobs loaded
and runs them if needed. When a job is executed, fcron forks, changes its user
and group permissions to match those of the user the job is being done for,
executes that job and mails the outputs to the user (this can be changed: see
Informative message about what fcron is doing are sent to
syslogd(8) under facility cron,
priority notice. Warning and error messages are sent
respectively at priority warning and
Note:fcron sleeps at least 20 seconds after it has been started before
executing a job to avoid to use too much resources during system boot.
Don't fork to the background. In this mode, fcron will
output informational message to standard error as well as to syslogd.
Force running in background, even if fcron has been
compiled to run in foreground as default.
Save fcrontabs on disk every
time sec (default is 1800).
Set to num the maximum number
of serial jobs which can run simultaneously. By default,
this value is set to 1.
Set to n the number of jobs the serial queue and
the lavg queue can contain.
Make fcron use config file
file instead of default config file
/etc/fcron.conf. To interact with that running
fcron process, fcrontab must use the same config file (which is defined by
fcrontab's option -c). That way, several fcron processes
can run simultaneously on an only system (but each fcron process *must* have a
different spool dir and pid file from the other processes).
Execute all jobs that need to be run at the time fcron
was started, wait for them, then return. Sets firstsleep to 0.
May be especially useful when used with options -y and
-f in a script run, for instance, at dialup connection.
See also: fcrontab's options volatile,
Don't log to syslog at all. May be useful when running
Sets the initial delay (in seconds) before any job is
executed, default to 20 seconds.
Create dir as a new spool
directory for fcron. Set correctly its mode and owner. Then, exit.
Display a brief description of the options.
Display an informational message about fcron,
including its version and the license under which it is distributed.
Run in debug mode (more details on stderr -- if option
-f is set -- and in log file)
Fcron returns 0 on normal exit, and 1 on
Save configuration (time remaining until next
execution, time and date of next execution, etc), wait for all running jobs and
Force fcron to reload its configuration.
Make fcron print its current schedule on syslog. It
also toggles on/off the printing on debug info on syslog.
Tell fcron to check if there is any configuration
update (this signal is used by fcrontab(5))
Should be POSIX compliant.
Configuration file for fcron, fcrontab and
fcrondyn: contains paths (spool dir, pid file) and default programs to use
(editor, shell, etc). See fcron.conf(5)
for more details.
Users allowed to use fcrontab and fcrondyn (one
name per line, special name "all" acts for everyone)
Users who are not allowed to use fcrontab and
fcrondyn (same format as allow file)
/etc/pam.d/fcron (or /etc/pam.conf)
PAM configuration file for
fcron. Take a look at pam(8) for more details.
If you're learning how to use fcron from scratch, I suggest
that you read the HTML version of the documentation (if your are not reading it
right now! :) ): the content is the same, but it is easier to navigate thanks
to the hyperlinks.