Copyright © 2000-2026 Thibault Godouet | Fcron 3.4.1 | Web page : http://fcron.free.fr

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# fcrondyn

## Name

fcrondyn -- dialog dyn-amically with a running fcron daemon

## Synopsis

fcrondyn [-c `file`] [-i]

fcrondyn [-c `file`] -x `command`

fcrondyn [-h]

## Description

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.

## Options

`-i`

  Run fcrondyn in interactive mode. fcrondyn is also run in interactive mode when no option is given.

`-x` `command`

  Run `command` and returns immediately. See below for syntax and a list of commands.

  > Note: If the `command` string consists of multiple words or contains spaces, you must enclose it in quotes in your shell.

`-c` `file`

  Make fcrondyn use config file `file` instead of default config file `/usr/local/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 a single system.

`-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.

## Command description

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 integer).

sig

  A signal number, or its name (case does not matter). For instance, "term" or "15".

niceval

  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

help, h

  Print an help message about fcrondyn's commands.

quit, q

  In interactive mode, quit fcrondyn.

ls [user]

  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.

ls_lavgq [user]

  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 run).

ls_serialq [user]

  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).

ls_exeq [user]

  Same as ls, but list only the jobs which are running.

detail jobid

  Print details about a job. jobid is the one given by ls.

runnow jobid

  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 jobid

  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.

OPTIONS

  List of main options which are set for the task:

  L

    Job which runs 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`).

  ST

    Serial Temporary - For the jobs which will be serialized only for the next execution (e.g. because of `bootrun`).

  SO

    Serial Once - if only at most one instance of the task can be in the serial queue at a given time (option `serialonce`).

  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.

SCHEDULE

  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.

## Return values

Fcrondyn returns 0 on normal exit and 1 on error.

## Conforming to

Should be POSIX compliant.

## Files

`/usr/local/etc/fcron.conf`

  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.

`/usr/local/etc/fcron.allow`

  Users allowed to use fcrontab and fcrondyn (one name per line, special name "all" acts for everyone)

`/usr/local/etc/fcron.deny`

  Users who are not allowed to use fcrontab and fcrondyn (same format as allow file)

`/usr/local/etc/pam.d/fcron` (or `/usr/local/etc/pam.conf`)

  PAM configuration file for fcron. Take a look at pam(8) for more details.

## See also

fcrontab(1),
fcrondyn(1),
fcrontab(5),
fcron.conf(5),
fcron(8).
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.

## Author

Thibault Godouet `<fcron@free.fr>`

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