2 added 140 characters in body
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Your example works for me if you omit the braces

$ tar --extract --file=test.tar.gz extract11

If your file extract11 is in a subfolder, you should specify the path within the tarball.

$ tar --extract --file=test.tar.gz subfolder/extract11

Your example works for me if you omit the braces

$ tar --extract --file=test.tar.gz extract11

Your example works for me if you omit the braces

$ tar --extract --file=test.tar.gz extract11

If your file extract11 is in a subfolder, you should specify the path within the tarball.

$ tar --extract --file=test.tar.gz subfolder/extract11
1
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Your example works for me if you omit the braces

$ tar --extract --file=test.tar.gz extract11