讨论；当echo启用时，打印路径到标准出错而非标准输出； - #237
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有时候，我会使用这种命令： $ (z mydir && sed 's/abc/def/g' mydoc.txt) >mynewdoc.txt 而这会导致mynewdoc.txt顶部多出一行/.../mydir 所以，没准我们可以将z.lua的echo输出打印到标准出错？
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有时候，我会使用这种命令：
$ (z mydir && sed 's/abc/def/g' mydoc.txt) >mynewdoc.txt
而这会导致mynewdoc.txt顶部多出一行/.../mydir
所以，没准我们可以将z.lua的echo输出打印到标准出错？