- 主页 [github.com]
ruby module that emulates the 'which' program
Searches the path, or a provided path with given separators (path_sep, commonly “:”) and a separator for directories (dir_sep, commonly “/”), will return all of the places that filename occurs. `filename' is included as a part of the output.
Note that the filename must both exist in the path and be executable for it to appear in the return value.
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