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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.