GNU BASH Rotater spinner functikn

#!/usr/bin/bash

#BASH rotater paste by:
#kaslmineer7999

rotater(){
    local frames=('|' '/' '-' '\')
    local frame="0"
    local command="$1"
    while [ 1 ]
    do
        printf "%s\r" "${frames[$frame]}"
        local frame="$(($frame+1))"
        [ "$frame" = "4" ] && local frame="0"
        sleep 0.1
    done &
    local pid=$!
    eval $command
    kill -9 $pid
}
#SYNTAX: rotater "YOUR_COMMAND"
#Note to replace "YOUR_COMMAND" with your actual command, keep in quotes