linux安装crond

sudo apt-get update
sudo apt-get install cron

sudo yum install cronie
sudo systemctl enable crond
sudo systemctl start crond

sudo dnf install cronie
sudo systemctl enable crond
sudo systemctl start crond

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
# For details see man 4 crontabs

# 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

sudo systemctl status crond
if [ $? -ne 0 ]; then
    sudo yum install cronie
    sudo systemctl enable crond
    sudo systemctl start crond
fi

chmod 600 /var/spool/cron/username

sudo journalctl -u crond