ls /var/log/cron*
ls: cannot access /var/log/cron*: No such file or directory

# cron.* /var/log/cron.log

journalctl _COMM=cron

journalctl _COMM=cron --since="date" --until="date"

# Mail any output to myuser@gmail.com, no matter whose crontab this is
MAILTO=myuser@gmail.com
# Run the following command ten minutes after midnight, every day
10 0 * * *       $HOME/bin/aJob.sh

# Run the following command ten minutes after midnight, every day
10 0 * * *       $HOME/bin/aJob.sh >> /tmp/aJob.log 2>&1

# Mail any output to myuser@gmail.com, no matter whose crontab this is
MAILTO=myuser@gmail.com
# Run the following command ten minutes after midnight, every day
10 0 * * *       $HOME/bin/aJob.sh >> /tmp/aJob.log