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common lisp 的路径测试函数 PROBE-FILE
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| 语法 | |
| probe-file pathspec => truename | |
| 参数和值 | |
| pathspec --- 路径指示符 | |
| truename --- 真实路径或者 nil | |
| 描述 | |
| probe-file 测试 pathspec 是否存在, 如果这个路径不存在, 则返回 nil. | |
| 反之返回 pathspec 的真实路径 | |
| 代码 | |
| * (probe-file "workspace") | |
| #P"/Users/zhouqiang/workspace/" | |
| 补充 | |
| 路径不能用正则表达式 |
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