$OPTARG  –  Last Argument Value Processed by getopts

$OPTARG contains the value of the last option argument processed by the getopts command.

Examples

Print value passed to argument -v:
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usage() { echo "$0 usage: -v <value>"; exit 0; }
[ $# -eq 0 ] && usage
      
declare value
# : because -v requires a value
while getopts "v:" arg; do
  case $arg in
    v) value="$OPTARG" ;;
    *) usage ;;
  esac
done
  
echo "Value passed to -v: $value"
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