fcrondyn - dialog dyn-amically with a running fcron daemon
fcrondyn [ -c file ] [ -i ]
fcrondyn [ -c file ] -x command
fcrondyn [ -h ]
Fcrondyn is a user tool intended to interact with a running fcron
daemon. It can, for instance, list user’s jobs loaded by fcron, run one
of them, renice a running job, send a signal to a running job, etc.
-i Run fcrondyn in interactive mode. fcrondyn is also run in
interactive mode when no option is given.
Run command and returns immediately. See below for syntax and a
list of commands.
Make fcrondyn use config file file instead of default config
file /etc/fcron.conf. To interact with a running fcron process,
fcrondyn must use the same config file as the process. That way,
several fcron processes can run simultaneously on an only
-d Run in debug mode. In this mode, many informational messages
will be output in order to check if anything went wrong.
-h Display a brief description of the options.
-V Display an informational message about fcrondyn, including its
version and the license under which it is distributed.
Fcrondyn’s command syntax is the following:
command arg1 arg2 [...]
An argument of a fcrondyn command is of one of the following type:
"ARGUMENT TYPES OF FCRONDYN’S COMMANDS"
user A valid user name.
jobid A job id given by one of fcrondyn’s ls* commands (i.e. an
sig A signal number, or its name (case does not matter). For
instance, "term" or "15".
A job priority value. A niceval is an integer from -20 (highest
priority) to 19 (lowest) (only root is allowed to use a negative
value with this option).
Last, but not least, the following commands are recognized (optional
arguments are between ): "VALID FCRONDYN’S COMMANDS"
h Print an help message about fcrondyn’s commands.
q In interactive mode, quit fcrondyn.
List all jobs of user. When ls is run by root, all users are
listed unless a user name is given as argument. See below for
some explanations about the fields used by ls* commands.
Same as ls, but list only the jobs which are in the load-average
queue (i.e. which are waiting for a lower load average to be
Same as ls, but list only the jobs which are in the serial queue
(i.e. which are waiting for other jobs to be finished).
Same as ls, but list only the jobs which are running.
Print details about a job. jobid is the one given by ls.
Instead of waiting for the next scheduled execution time, run
the job now. The next execution time is changed as if the job
had run on schedule.
Run the job now. Its next execution time is not changed.
kill sig jobid
Send a signal to a running job.
renice niceval jobid
Change the priority of a running job. "FIELDS USED BY DETAIL
AND LS* COMMANDS"
ID Job’s unique identification number.
USER User who owns this job.
PID The pid of the running job.
INDEX Index of the job in the serial queue (i.e. it will be run when
all the jobs of an inferior index have been run)
R&Q The job has this number instances of the given task which are
either running or queued in the serial or lavg queue.
List of main options which are set for the task. L for the jobs
which run only under a given system Load average (option lavg,
lavg1, lavg5 and lavg15), LO (Load average Once) if only at most
one instance of the task can be in the load average queue at a
given time (option lavgonce), S for serialized jobs (option
serial), SO for the jobs which will be serialized only for the
next execution (Serial Once), and ES if several instances of the
same job can run simultaneously (option exesev).
LAVG 3 values, corresponding to the 1, 5, and 15-minute (in this
order) system load average values below which the job will be
run, otherwise it will be queued until the system load average
is appropriate (see lavg option).
UNTIL Field corresponding to the until option.
STRICT Field corresponding to the strict option. Y for yes, N for no.
Next run is scheduled at this time and date. Please note that
fcrondyn prints the next execution time and date in the time
zone of the system where fcron is running, and not the time zone
which can be defined for using option timezone.
CMD The command that will be executed.
Fcrondyn returns 0 on normal exit and 1 on error.
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
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.
Thibault Godouet <firstname.lastname@example.org>