ubuntu下创建定时任务的两种方式及常见问题解决方案

crontab -l

LC_CTYPE="zh_CN.utf-8"
# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at a.m every week with:
# * * tar -zcf /var/backups/home.tgz /home/

apt-get install cron

# For more information see the manual pages of crontab(5) and cron(8)
#
# m h dom mon dow command
7 15 * * * /usr/bin/python2.7 /home/mabo/Desktop/camera.py

二选一即可
sudo nano /etc/crontab
sudo vi /etc/crontab

# m h dom mon dow user command
17 * * * * root cd / && run-parts --report /etc/cron.hourly
25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --repo$
47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --repo$
52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --repo$
#
17 16 * * * mabo /usr/bin/python2.7 /home/mabo/Desktop/camera.py

crontab -l //查看设置的所有定时任务
service crond start //启动服务
service crond stop //关闭服务
service crond restart //重启服务

下面二选一即可
sudo nano /var/log/cron.log
sudo vi /var/log/cron.log