If you type a command name, then bash looks for that command on your path, which is a colon-separated list of directories in the path environment variable.

如果输入一个命令名，那么bash将在您的路径(path)中查找该命令，路径就是指path环境变量中以冒号分隔的目录列表。

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The type -a command reveals all instances of Perl that the shell is aware of, which depends largely on the PATH variable.

type - a命令显示了Shell所知道的所有Perl实例，这在很大程度上依赖于PATH变量。

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Create a dummy, and add a Path Constraint to make it follow the same spline, but now (with Auto Key on) go to frame 0 and type in 10% in the % Along Path field.

创建一个虚拟体，添加一个路径约束，让它跟着同一条曲线运动，但是现在(保持自动关键帧打开)回到第0帧，将百分比调到10%。

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