Bash Standard Command Line Option Processing Pattern

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Overview

while [[ -n $1 ]]; do
  if [[ $1 = "--verbose" ]]; then
    # no value
    ....
  elif [[ ${1:0:7} = "--type=" ]]; then 
    # value expected
    type=${1:7}  
    ...
  else
   echo "unknown argument $1" 1>&2
  fi
  shift
done