Gunzip

Hi,
in note 314422.1 it is said :
For example:
gunzip rda.tar.gz or
but when I
$ gunzip rda_4.8-070607.tar.gz
I have :
gunzip: rda_4.8-070607.tar.gz: not in gzip format
I can not understand. Many thanks for help.

How did you transfer the file to the server where you are unzipping?

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