Shift positional parameters.
Syntax shift [n]
The positional parameters from n+1 ... are renamed to $1 ....
Parameters represented by the numbers $# down to $#-n+1 are unset.
n must be a non-negative number less than or equal to $#. If n is 0, no parameters are changed. If n is not given, it is assumed to be 1. If n is greater than $#, the positional parameters are not changed.
The return status is greater than zero if n is greater than $# or less than zero; otherwise 0.
This is a BASH shell builtin, to display your local syntax from the bash prompt type: help shift
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set - Set a shell variable = value