For example, if you don't like grids, use unset grid.
例如，如果您不想要网格，使用unsetgrid 。
If this is set, even root cannot delete the file until the attribute is unset.
设置完成后，即使是root用户也不能删除文件，直到属性解除。
Unset your variables to free memory, especially large arrays.
注销那些不用的变量尤其是大数组，以便释放内存。
Unset your variables to free memory, especially large arrays.
注销那些不用的变量尤其是大数组，以便释放内存。
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