1. 编辑配置文件：

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    #增加任务：
    crontab -e

    # 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 5 a.m every week with:
    # 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
    # 
    # For more information see the manual pages of crontab(5) and cron(8)
    # 
    # m h  dom mon dow   command

    #每分钟访问百度首页
    */1 * * * *  curl -v "http://www.baidu.com"

  2. 重启

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    sudo service cron restart

  3. 查看任务

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    crontab -l

  4. 删除任务

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    crontab -r