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  • Thanks. I am a little confused. What does *" foobar "* expand to? Does * match any string, so foobarbaz should be in *" foobar "*? Commented May 2, 2016 at 22:02
  • In that context, it's a pattern where * will match zero or more of any character. We are checking if the string " foobar " is contained in the string " ${!foobar*} " Commented May 2, 2016 at 22:12