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Shift positional parameters to the left by n.
      shift [n]

      n  : The number of parameters to shift (default = 1)

The positional parameters from
n+1 ... $#
are renamed to
$1 ... $#-n+1

Parameters represented by the numbers $# to n+1 are unset.

n must be a positive number less than or equal to $#.

The return status is zero unless n is greater than $# or less than zero.

shift is a BOURNE shell command and a POSIX `special' builtin.

Related commands:

getopts - Parse positional parameters