crontab

Contents:

Crontab
Logging
Using ssh with cron
Echolink/svxlinki - echolink-pi
archlinux
MTR2000 DMR Platform - pi-star
AllStarLink - barc-asl
crontab examples

Crontab

Crontab run with the sh shell and very limited env settings Crontab Commands:

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Logging

Using ssh with cron

When using ssh in a cron command or a script run by cron you must use keys with a blank pass phrase so that there is no tty input required. No script can request input from the tty.

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Echolink/svxlinki - echolink-pi

uname -a --> Linux echolink-pi 5.10.63-v7+ #1496 SMP Wed Dec 1 15:58:11 GMT 2021 armv7l GNU/Linux

root@echolink-pi:/etc# cat crontab
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name command to be executed
17 *	* * *	root    cd / && run-parts --report /etc/cron.hourly
25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6	* * 7	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6	1 * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )

Add this line to reboot weekly:

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archlinux

uname -a --> Linux r26-shari 5.4.75-1-ARCH #1 SMP PREEMPT Mon Nov 9 16:58:39 UTC 2020 armv7l GNU/Linux

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MTR2000 DMR Platform - pi-star

Login and glenn and execute sudo -s before running crontab -e oth the user and the permision level change what you see in crontab, on MTR2000 DMR Platform. After editing check with cat /etc/crontab.

uname -a --> Linux pi-star 5.10.4-sunxi #20.11.7 SMP Tue Jan 5 23:17:54 CET 2021 armv7l GNU/Linux

run-parts runs all the executable file in the folder name passed in the commandline.

Add the following line to reboot weekly.

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AllStarLink - barc-asl

uname -a --> Linux barc-asl 5.4.75-1-ARCH #1 SMP PREEMPT Mon Nov 9 16:58:39 UTC 2020 armv7l GNU/Linux

crontab should look like this:

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crontab examples

Example Cron Schedules: https://cron.help/examples

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20220505 - pre published v0.9