Step by step for crontab stop setup Sea@sea:/etc/lazada$ sudo crontab -e 1.Edit cron job 0 */6 * * * curl -X POST -d @/etc/lzd/lzd_tracking.txt http://localhost:8080/booking/rs/LzdService/post --header "Content-Type:application/json" Chnage it like : #0 */6 * * * curl -X POST -d @/etc/lzd/lzd_tracking.txt http://localhost:8080/booking/rs/LzdService/post --header "Content-Type:application/json" 2.restart cron job Sea@sea:/etc/lazada$ sudo /etc/init.d/cron reload Sea@sea:/etc/lazada$ sudo /etc/init.d/cron restart 3.check crontab if succeed start Sea@sea:/etc/lazada$ sudo ps -ef| grep cron root 30871 1 0 12:22 ? 00:00:00 cron
/etc/lazada/lazada_tracking.txt json 数据--> 用于post
crontab ubuntu16.04 基本使用:
ubuntu安装cron(默认有安装)
安装：apt-get install cron 启动：service cron start 重启：service cron restart 停止：service cron stop 检查状态：service cron status 查询cron可用的命令：service cron 检查Cronta工具是否安装：crontab -l
来打开你的用户所属的crontab文件。第一次用这个命令，会让你选择文本编辑器，我选的是vim。选定的编辑器也可以使用
select-editor
命令来更改。选择vim
#编辑 crontab -e # 添加任务 # 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 #*/1 * * * * date >> /home/sea/Desktop/baxiancode/mytest.log 0 2 * * * /home/sea/Desktop/baxiancode/start_daily_tops_service/start_daily_tops_service.sh #*/30 * * * * nohup /home/sea/Desktop/MyShop/shopmonitor/shopmonitor/shopmonitor/start_shop_monitor.sh >> /home/sea/Desktop/baxiancode/shopmonitor.log 2>&1 & */30 * * * * nohup /home/sea/Desktop/MyShop/shopmonitor/shopitemmonitor/shopitemmonitor/start_shop_item_monitor.sh >> /home/sea/Desktop/baxiancode/shop_item_monitor.log 2>&1 &
保存了crontab之后，我们还需要重启cron来应用这个计划任务。使用以下命令：
sudo service cron restart
crontab -l 命令列出它的全部信息
crontab 在线测试：https://www.matools.com/crontab
crontab 每分钟、每小时、每天、每周、每月、每年定时执行
crontab时间格式说明 minute(分)可以设置0-59分 hour（小时）可以设置0-23小时 day of month（日期）可以设置1-31号 month（月份）：可以设置1-12月 day of week（星期）：可以设置0-7星期几，其中0和7都代表星期天，或者我们也可以使用名称来表示星期天到星期一，例如sun表示星期天，mon表示星期一等等
crontab范例 每五分钟执行 */5 * * * * 每小时执行 0 * * * * 每天执行 0 0 * * * 每周日00:00:00执行 0 0 * * 0 每月１号,0零点执行 0 0 1 * * 每年执行 0 0 1 1 *
crontab 范例：
0 1 * * 1 每周一，1:00 AM 执行一次 2021-10-04 01:00:00
0 2 1 * * 每月1号，２点执行 2021-10-01 02:00:00
