cron_add: Make a simple cron job

In cronR: Schedule R Scripts and Processes with the 'cron' Job Scheduler

Make a simple cron job

Description

Generate a cron job, and pass it to crontab.

The goal is to be able to translate simple English statements of intent to the actual cron statement that could execute that intent. For example,

"I want to run a job daily at 7AM."

is simply

cron_add(<command>, "daily", at="7AM")

Another example, "I want to run a job on the 15th of every month."

is

cron_add(<command>, "monthly", days_of_month="15th")

Usage

cron_add(
  command,
  frequency = "daily",
  at,
  days_of_month,
  days_of_week,
  months,
  id,
  tags = "",
  description = "",
  dry_run = FALSE,
  user = "",
  ask = TRUE,
  env = character()
)

cronjob(
  command,
  frequency = "daily",
  at,
  days_of_month,
  days_of_week,
  months,
  id,
  tags = "",
  description = "",
  dry_run = FALSE,
  user = "",
  ask = TRUE,
  env = character()
)

Arguments

command	A command to execute.
frequency	A character string equal to one of "minutely", "hourly", "daily", "monthly", or "yearly". Or any complex cron schedule - see the examples.
at	The actual time of day at which to execute the command. When unspecified, we default to "3AM", when the command is to be run less frequently than "hourly".
days_of_month	Optional; the day(s) of the month on which we execute the command.
days_of_week	Optional; the day(s) of the week on which we execute the command.
months	Optional; the month(s) of the year on which we execute the command.
id	An id, or name, to give to the cronjob task, for easier revision in the future.
tags	A set of tags, used for easy listing and retrieval of cron jobs.
description	A short description of the job, and its purpose.
dry_run	Boolean; if TRUE we do not submit the cron job; instead we return the parsed text that would be submitted as a cron job.
user	The user whose cron jobs we wish to examine.
ask	Boolean; show prompt asking for validation
env	Named character; set environment variables for a cron job. Specify 'Sys.getenv()' to inherit the variables from the current R session.

Examples

f   <- system.file(package = "cronR", "extdata", "helloworld.R")
cmd <- cron_rscript(f)
cmd

cron_add(command = cmd, frequency = 'minutely', 
  id = 'test1', description = 'My process 1', tags = c('lab', 'xyz'))
cron_add(command = cmd, frequency = 'daily', at='7AM', id = 'test2')
cron_njobs()

cron_ls()
cron_clear(ask=TRUE)
cron_ls()

cmd <- cron_rscript(f, rscript_args = c("productx", "arg2", "123"))
cmd
cron_add(cmd, frequency = 'minutely', id = 'job1', description = 'Customers')
cron_add(cmd, frequency = 'hourly', id = 'job2', description = 'Weather')
cron_add(cmd, frequency = 'hourly', id = 'job3', days_of_week = c(1, 2))
cron_add(cmd, frequency = 'hourly', id = 'job4', at = '00:20', days_of_week = c(1, 2))
cron_add(cmd, frequency = 'daily', id = 'job5', at = '14:20')
cron_add(cmd, frequency = 'daily', id = 'job6', at = '14:20', days_of_week = c(0, 3, 5))
cron_add(cmd, frequency = 'daily', id = 'job7', at = '23:59', days_of_month = c(1, 30))
cron_add(cmd, frequency = 'monthly', id = 'job8', at = '10:30', 
  days_of_month = 'first', days_of_week = '*')
cron_add(cmd, frequency = '@reboot', id = 'job9', description = 'Good morning')
cron_add(cmd, frequency = '*/15 * * * *', id = 'job10', description = 'Every 15 min')   
cron_ls()
cron_clear(ask=TRUE)

cronR documentation built on Jan. 9, 2023, 5:10 p.m.