And if you want to know how it happens step by step, here it is: first you have a gzip-compressed tar-archive called
gsmile-0.1.1.linux-i686.tar.gz. Then you gunzip-uncompress it:
Code:
gunzip gsmile-0.1.1.linux-i686.tar.gz
and you get the tar file out of it, called
gsmile-0.1.1.linux-i686.tar
Then you untar it with
Code:
tar -xf gsmile-0.1.1.linux-i686.tar
and get out whatever is in the tar archive. The command
tar -xzf simply includes the "gunzip" part (the -z option; it would be -j for bzip2 archives), making these two steps in one command.