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Current File : //proc/thread-self/root/usr/share/zsh/5.5.1/help/shift
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
       instead 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.

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