----- Original Message -----
> (1) There are so may warnings like this:
>
> crash: xxxxxx: original filename unknown
> Use "-f xxxxxx" on command line to prevent this message.
>
> Do I need to add somay "-f xxxxxx" options on command line? Is there
> any better method?
The message above simply mean that the original filename of the compressed
file was not stored in the file's header. That means that whoever created
the compressed file used "gzip -n" or "--no-name":
$ man gzip
... [ cut ] ...
-n --no-name
When compressing, do not save the original file name and time
stamp by default. (The original name is always saved if the name
had to be truncated.) When decompressing, do not restore the
original file name if present (remove only the gzip suffix from
the compressed file name) and do not restore the original time
stamp
if present (copy it from the compressed file). This option is the
default when decompressing.
...
I should also add that you do *not* need to add "-f xxxxx" options. They are
harmless, information-only messages.
Dave