Method Gz.File()->open()
- Method
open
 intopen(string|int|Stdio.Streamfile,void|stringmode)- Parameter 
file Filename or filedescriptor of the gzip file to open, or an already open Stream.
- Parameter 
mode mode for the file. Defaults to "rb". May be one of the following:
- rb
 read mode
- wb
 write mode
- ab
 append mode
For the wb and ab mode, additional parameters may be specified. Please se zlib manual for more info.
- Returns
 non-zero if successful.