Close the associated files.

Ropen opens a buffered reader.

Wopen opens a buffered reader. If f == "-", then stdout will be used. If f endswith ".gz", then the output will be gzipped. If f startswith "tmp:" the

Exists checks if a local file exits

ExpandUser expands ~/path and ~otheruser/path appropriately.

Buf returns a buffered reader from an io.Reader. If f == "-", then it will attempt to read from os.Stdin. If the file is gzipped, it will be read as s

IsGzip returns true buffered Reader has the gzip magic.

IsStdin checks if we are getting data from stdin.

Name returns the path to the underlying file.

CheckBytes peeks at a buffered stream and checks if the first read bytes match.

Flush the writer.

XReader returns a reader from a url string or a file.

Close the associated files.