Windows 下的 cron 程序

这段时间因为有个网页需要定时更新，但服务器又不支持自定义定时计划任务，因此考虑使用网站程序来更新，本地计算机启用定时计划任务来执行，搜索了一下 windows cron,果然有收获,下载了一个cron.exe 是windows下面的一个自动定时扫描程序，会自动执行crontab里面的命令，试了一下，感觉还不错.

Linux 下非常流行并且好用的定时任务管理程序 cron，比起 windows 下的 计划任务， 不知道好到哪里去了。突然想在 windows 下应该有类似的程序，于是搜索”windows cron”，果然有收获。顺便感叹一下，互联网时代，准确的定位“关键词”是一门学问。换个角度来说，以互联网的思维，用简练的词汇来总结你所要的，互联网信息就能够为你所用了。
使用步骤
- 下载 cron 主程序，并解压缩到某目录，地址 http://www.kalab.com/freeware/cron/cron.zip 
- 运行目录 cron.exe 启动 cron ，当然一般需要拷贝到”启动”以便 cron 每次开机自动启动
- 在 crontab 中按照 linux 一样的格式定义任务即可，每次执行命令会在安装目录下生成一个 cron.log 文件，记录执行情况
试用了一下，发现有些问题：
在命令行下能够执行的某些命令比如 time /T >c:\test.txt ，放到 crontab 中执行，log 文件中会提示：Error: The specified file was not found. 也就是找不到 time 命令，估计是 cron.exe 不会根据系统 PATH 去寻找命令。同样执行 dir 这样，但是 xcopy 执行成功。而写一个批处理文件的不好就是屏幕上还是会闪现一下命令行窗口。
更多信息参考 http://www.kalab.com/freeware/cron/cron.htm

顺便将一些简要参数也摘录过来

Setup for first version (Windows 9x/NT)
copy the files cron.exe and crontab to a folder of your choice
edit the file crontab (see the examples as a reference)
create a link to cron.exe and move it to the startup folder
Setup for NT service
create a crontab file in your SYSTEM32 folder
execute the included ntsetup.exe
call "crons.exe /?" in a command line to see the available options of crons
The Crontab file
Each line of CRONTAB has the following structure:
<Minute> <Hour> <Day> <Month> <Day of Week> <Command line>

Position:
Values:
Minute
0-59
Hour
0-23
Day
1-31
Month
1-12
Day of week
0-6 (0=Sunday, 1=Monday, ..., 6=Saturday)
Instead of minute, hour, day, month or day of week it's also possible to specify a *. A * represents all possible values for that position (e.g. a * on 2nd position is the same as specifying all the possible values for hour)
It's also possible to specify several values separated by commas: e.g. if you want a command to be executed every 10th minute so you can specify 0,10,20,30,40,50 for minute. A range of values can be specified with a -: e.g. value 0-12 for hour -> every hour a.m.
Comments
Every line not starting with a number is treated as a comment.
Examples
execute a command every minute
# This is a comment.
  * * * * * c:\tools\CheckForNewFiles.exe
execute the program backup.bat every hour
# This is a comment.
  0 * * * * c:\tests\backup.bat
do a backup every day at 0.30 p.m.
# This is a comment.
  30 12 * * * c:\tests\backup.bat
start a backup every tuesday at midnight
# This is a comment.
  0 0 * * 3 c:\tests\backup.bat
scan drive c for viruses on the 1st of every month at 2.45 p.m.
# scan for known viruses
  45 14 1 * * c:\path_to_scanner\scan c:
copy some files every half hour
# This is a comment.
  0,30 * * * * xcopy c:\docs\*.* y:\users /s
copy a file every hour (a.m.) only on weekdays
# System commands need the command interpreter specified:
0 0-12 * * 1-5 c:\...\cmd.exe /c "copy c:\... e:\"

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