tar does not like me

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Autor: Mike Starke
Data:  
Assunto: tar does not like me
Tried tar -t rdeskt~1.gz
Tried tar -t rdesktop-1.1.0.tar.gz
Tried tar -tg rdeskt~1.gz
Tried tar -tg rdesktop-1.1.0.tar.gz
Tried tar -xg rdeskt~1.gz
Tried tar -xg rdesktop-1.1.0.tar.gz
Tried tar -xg rdeskt~1.gz
Tried tar -xg rdesktop-1.1.0.tar.gz
Tried several more combinations.

Don't you need a -f in the tar command?
I.E 'tar -xvf <filename>'

v/r
-Mike