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Linux crontab 访问PHP URL完成定时任务

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Jun 20, 2016 pm 12:45 PM

crontab -e 新建/编辑一个任务
crontab -l 列出所有任务

crontab 格式：

基本格式 :
分钟小时日月星期命令
第1列表示分钟1～59 每分钟用或者 /1表示
第2列表示小时1～23（0表示0点）
第3列表示日期1～31
第4列表示月份1～12
第5列标识号星期0～6（0表示星期天）
第6列要运行的命令

执行PHP脚本：
* * * * * /usr/bin/php -f /root/test.php >> test.log

表示“每隔一分钟执行test.php文件，脚本的结果输出到test.log里”。注意目录问题。

比如test.php里的代码可以是echo date("Y-m-d H:i:s") \n这种。

由于我是第一次用crontab，测试发现bin/php 这种方式只能单PHP文件可以完成的任务，如果涉及到include，require，要注意路径问题，涉及到“类（class）”似乎就不行了。希望哪位指点一下。

另外需要注意这个脚本需要有执行权限。

而我本人需要完成的任务是定时访问一个文件（链接）去生成sitemap，所以访问URL就不能用bin/php 去完成，而是要用bin/curl。所以我的代码就成了下边这样：

* * * * * /usr/bin/curl http://aa.com:8080/tools/sitemap.php >> /Desktop/untitled.html

关于这个命令里后边的输出，并不是必须的，只是为了方便在写命令的时候调试。

关于crontab命令的参数建议看一下手册，这里只复制了一段查到的资料里提到的。

本站@Jacendfeng 的这篇Linux 下执行定时任务 crontab 命令详解写的非常详细，建议看一下。

参考资料：
鳥哥的 Linux 私房菜 -- 第十五章、例行性工作排程(crontab)
linux 自动执行 crontab学习笔记
linux定时调用指定url链接,linux crontab定时执行php脚本程序介绍
linux使用crontab实现PHP执行定时任务

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