Setting up crontab entries requires a string with escaped shell metacharacters, so it is best done with simple commands and parameters.
设置crontab条目需要一个包含转义的shell元字符的字符串，所以适合于简单的命令和参数。
Understanding the various tests and knowing that the shell can also interpret some operators as shell metacharacters is an important step to becoming a power shell user.
理解不同的测试并认识到shell还能把一些操作符解释成shell元字符，是成为高级shell用户的重要一步。
Metacharacters: Metacharacters are characters that have special meanings to programs or libraries you depend on, such as the command shell or SQL.
元字符：元字符是在您所依赖的程序或库中——比如命令shell或者SQL——有特定含义的字符。
Metacharacters: Metacharacters are characters that have special meanings to programs or libraries you depend on, such as the command shell or SQL.
元字符：元字符是在您所依赖的程序或库中——比如命令shell或者SQL——有特定含义的字符。
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