Cron - Revision history

Clint93@uab.edu: give first example description

2021-03-18T15:54:08Z

give first example description

← Older revision		Revision as of 15:54, 18 March 2021
Line 126:		Line 126:
	=== Hello World Using Cron ===		=== Hello World Using Cron ===

			In this example, the bash script is used to tell Slurm how many resources to allocate for the given job and to output redirect I/O "hello" to a text file. The crontab file submits the bash script (crontab.sh) to Slurm as an sbatch job every minute.
	==== Bash Script to Submit Sbatch job to Slurm ====		==== Bash Script to Submit Sbatch job to Slurm ====

Line 151:		Line 152:
	echo "Hello World" > hello.txt		echo "Hello World" > hello.txt

	~~</pre>~~


	~~Finally, the last line:~~
	~~<pre>~~
	~~echo "Hello World" > hello.txt~~
	</pre>		</pre>

2021-03-18T15:42:24Z

remove mailto

2021-03-18T15:41:44Z

2021-03-18T15:41:24Z

edit

← Older revision		Revision as of 15:41, 18 March 2021
Line 1:		Line 1:
	= Cron =		= Cron =

	=== What Is Cron? ===		=== What Is Cron? ===
Line 68:		Line 68:
	<pre>		<pre>
	$ crontab -i -r		$ crontab -i -r
			</pre>

			To remove specified user cron entries
			<pre>
			$ crontab -r -u USERNAME
	</pre>		</pre>

Line 113:		Line 118:
	$ export $USER="alice01"		$ export $USER="alice01"
	</pre>		</pre>


			More on the syntax of sbatch scripts can be found [https://github.com/wwarriner/slurm_cheatsheets/blob/master/sbatch_cheat_sheet.pdf here].

			In case you're new to slurm, feel free to checkout their documentation: [https://slurm.schedmd.com/documentation.html]

	=== Hello World Using Cron ===		=== Hello World Using Cron ===
Line 142:		Line 152:

	</pre>		</pre>


			Finally, the last line:
			<pre>
			echo "Hello World" > hello.txt
			</pre>

			To expand more on I/O redirection, navigate to the following link: https://homepages.uc.edu/~thomam/Intro_Unix_Text/IO_Redir_Pipes.html

	==== Crontab File ====		==== Crontab File ====
Line 159:		Line 177:
	#!/usr/bin/env		#!/usr/bin/env
	</pre>		</pre>

			This line
			<pre>
			MAILTO=$USER@uab.edu
			</pre>


	== Advanced Examples ==		== Advanced Examples ==

	Navigate to https://gitlab.rc.uab.edu/mmoo97/DTN_tests for a nice advanced example on how to use cron on Cheaha.		Navigate to this [https://gitlab.rc.uab.edu/mmoo97/DTN_tests repo] for a nice advanced example on how to use cron on Cheaha.

	For more info on this application: https://www.globusworld.org/tour/data-mobility-exhibition		For more info on this application: [https://www.globusworld.org/tour/data-mobility-exhibition]

2021-03-17T15:37:54Z

2021-03-17T14:05:30Z

add advanced section

← Older revision		Revision as of 14:05, 17 March 2021
Line 159:		Line 159:
	#!/usr/bin/env		#!/usr/bin/env
	</pre>		</pre>

			== Advanced Examples ==

			Navigate to https://gitlab.rc.uab.edu/mmoo97/DTN_tests for a nice advanced example on how to use cron on Cheaha.

			For more info on this application: https://www.globusworld.org/tour/data-mobility-exhibition

2021-03-17T14:04:31Z

2021-03-16T17:13:26Z

add setup

← Older revision		Revision as of 17:13, 16 March 2021
Line 92:		Line 92:
	== Rudimentary Examples ==		== Rudimentary Examples ==

			=== Setup ===

			First off, make sure you have the $USER environment variable set in order to run these scripts. You can check by entering the following command in Cheaha's shell:

			<pre>
			$ echo $USER
			</pre>

			The output of this command should yield your blazerID.

			In the case that the output was blank, you'll need to set your blazerid to the $USER environment variable. You can do so by entering the following command in Cheaha's shell:

			<pre>
			$ export $USER="<your_blazerid>"
			</pre>

			Be sure to replace <your_blazerid> with your actual blazerid. Here's an short example where alice01 is the blazerid:

			<pre>
			$ export $USER="alice01"
			</pre>
	=== Hello World Using Cron ===		=== Hello World Using Cron ===

2021-03-16T16:54:42Z

add a simple example bash script for the first cron example

← Older revision		Revision as of 16:54, 16 March 2021
Line 98:		Line 98:

	<pre>		<pre>
			#!/bin/bash

			# resources
			#SBATCH cpus-per-task=1
			#SBATCH mem-per-cpu=4G
			#SBATCH array=-1%1
			#SBATCH partition=express

			# job name, error and output files
			#SBATCH --job-name=cron-job
			#SBATCH error=err_%j_4a.log
			#SBATCH output=out_%j_%4a.log
			#SBATCH ntasks=1

			# email address to request notifications when the job is complete or if it fails
			#SBATCH --mail-type=FAIL
			#SBATCH --mail-user=$USER@uab.edu


			# redirects the output to a .txt file
			echo "Hello World" > hello.txt

	</pre>		</pre>

2021-03-16T16:37:09Z

edit Rudimentary Examples

← Older revision		Revision as of 16:37, 16 March 2021
Line 95:		Line 95:
	=== Hello World Using Cron ===		=== Hello World Using Cron ===

	== Bash Script to Submit Sbatch job to Slurm ==		==== Bash Script to Submit Sbatch job to Slurm ====

	<pre>		<pre>
Line 102:		Line 102:
	</pre>		</pre>

	== Crontab File ==		==== Crontab File ====

	<pre>		<pre>