Haskell: findExecutable : Get the path of given executable

System.Directory module provides findExecutable function which return the path of given executable file. Following is the signature of the findExecutable function.

Prelude System.Directory> :t findExecutable

findExecutable :: String -> IO (Maybe FilePath)

Observe the signature, it takes a executable file name as input and return Just Path, if the executable exists, else return Nothing.

Prelude System.Directory> findExecutable "java"
Just "/usr/bin/java"
Prelude System.Directory> findExecutable "cabal"
Just "/usr/local/bin/cabal"
Prelude System.Directory> 
Prelude System.Directory> findExecutable "krishna"
Nothing

Note

findExecutable searcher for the file in the directories listed in system PATH. On Windows, findExecutable calls the Win32 function SearchPath.

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