Bash shift

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This built-in command takes one number as argument and shifts the positional parameters to the left by that number. The positional parameters from n + 1 to $# are renamed to variable names from $1 to $# - n + 1. The first n positional parameters are thrown away.

If the number is not present, it is assumed to be 1.

If n is zero or greater than $#, the positional parameters are not changed and the command has no effect.