Copy source to destination path: if destination is a directory, source will be copied in the dir with the file basename.

CopyDir copies a whole directory recursively overwriting contents.

EachLine walks lines, calling EachLineFunc for each line of the file.

Exists reports whether the named file or directory exists.

IsDir reports whether d is a directory.

IsRegular reports whether filepath is a regular file.

IsSamePath returns true if two different strings refer to the same file.

IsSymlink returns if a given file is a symbolic link on a Unix like OS or false if the OS is Windows.

ReadLines returns a slice containing file lines.

Sha1Sum gives the checksum for the given file.

EachLineFunc is definition of callback.