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  • Just curious, how did you get the man page for this? Commented Aug 2, 2018 at 15:08
  • Have you tried man bash and then searched for parameter##? Commented Aug 2, 2018 at 15:34
  • Yeah, I did do man bash but silly me, I searched for ${ so it failed to find some match. Thanks. Commented Aug 2, 2018 at 15:40