In this line, FindByName search the name in `ps` output: https://github.com/radovskyb/process/blob/19aa1db15317c63efd965f42d168f1885abc5e35/process.go#L230 but the output already have `ToLower` https://github.com/radovskyb/process/blob/19aa1db15317c63efd965f42d168f1885abc5e35/process.go#L224 So if you search a process name with capital letters, It will return nil.