一旦你正确放置了命令 通过保存文件退出编辑器 对于纳米-> Ctrl + X 对于 vi -> ：wq！
使用一些电子邮件/打印声明检查您的脚本。
first do crontab -l to see your existing crontab and jobs if you don't anything then do crontab -e
check you editor maybe VI or nano or anything like that.. go to insert mode by 'i', command should be like (cron expression)[space](program execution address from home)[space](your script address from home)
example (0 /2 * * * /conda///bin/python3 ///USERNAME/TEST_PYTHON_SCRIPT.py >> execution_log.txt)
execution_log.txt will have the execution log of your script.
once you have your command correctly placed exit the editor by saving the file for nano -> ctrl + x for vi -> :wq!
check your scripts with some email/print statement.
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Just do：
开头的0表示在第0分钟运行。 （如果是 *，则脚本将在每隔一小时内每分钟运行一次。）
不要忘记，您可以检查系统日志以查看它是否真正运行过！
Just do:
The 0 at the beginning means to run at the 0th minute. (If it were an *, the script would run every minute during every second hour.)
Don't forget, you can check syslog to see if it ever actually ran!
该行应为：
或
The line should read either:
or
答案来自 https://crontab.guru/every-2-hours。这很有趣。
The answer is from https://crontab.guru/every-2-hours. It is interesting.
0 */1 * * * “每小时过 0 分钟。”
0 */2 * * * “每 2 小时 0 分。”
这是为每个小时设置 cronjobs 的正确方法。
0 */1 * * * “At minute 0 past every hour.”
0 */2 * * * “At minute 0 past every 2nd hour.”
This is the proper way to set cronjobs for every hr.
要进入 crontab ：
将其写入文件中：
示例：
0 */2 * * * python ec2-user/home/demo.py并确保在最后一个 cron 后保留一个空行crontab 文件中的作业
To Enter into crontab :
write this into the file:
Example :
0 */2 * * * python ec2-user/home/demo.pyand make sure you have keep one blank line after the last cron job in your crontab file
首先执行 crontab -l
查看您现有的 crontab 和作业
如果你什么都不做，那就做
crontab -e
检查你的编辑器可能是 VI 或 nano 或类似的东西..按“i”进入插入模式，
命令应该像
(cron 表达式)[空格](家中的程序执行地址)[空格](家中的脚本地址)
示例
(0 /2 * * * /conda///bin/python3 /< /strong>//USERNAME/TEST_PYTHON_SCRIPT.py>>execution_log.txt）
一旦你正确放置了命令
通过保存文件退出编辑器
对于纳米-> Ctrl + X
对于 vi -> ：wq！
使用一些电子邮件/打印声明检查您的脚本。
first do crontab -l
to see your existing crontab and jobs
if you don't anything then do
crontab -e
check you editor maybe VI or nano or anything like that.. go to insert mode by 'i',
command should be like
(cron expression)[space](program execution address from home)[space](your script address from home)
example
(0 /2 * * * /conda///bin/python3 ///USERNAME/TEST_PYTHON_SCRIPT.py >> execution_log.txt)
once you have your command correctly placed
exit the editor by saving the file
for nano -> ctrl + x
for vi -> :wq!
check your scripts with some email/print statement.