File: shift

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shift [ -p ] [ n ] [ name ... ]
       The  positional  parameters  ${n+1}  ...  are renamed to $1 ...,
       where n is an arithmetic expression that defaults to 1.  If  any
       names are given then the arrays with these names are shifted in-
       stead of the positional parameters.

       If the option -p is given arguments are instead removed (popped)
       from the end rather than the start of the array.