Automatically add a command to cronjob to 1 minute later and remove once it starts (good for testing if a command runs well in a cronjob)

cronner_auto.sh

#!/bin/bash

# For example a Python command
user=type your user
folder=type your folder
command="source $HOME/.bashrc && source /home/$user/myenv/bin/activate && cd /home/$user/public_html/$folder && python index.py -run"

if [ "$1" = "-dummy" ]; then
	command="$command $1"
elif [ "$2" = "-dummy" ]; then
	command="$command $2"
fi

if [ "$1" = "-run" ]; then
	eval $command
else
	crontab -l > cron_orig
	cp cron_orig cron_new
	echo $(date -d "1 minute" +"%-M %-H %-d %m %-w") $command >> cron_new
	crontab cron_new
	rm cron_new
	sleep 60
	crontab cron_orig
	rm cron_orig
fi