Template File for Parsing Command Line Arguments in Bash

bash_parse_argument_template.sh

#! /bin/bash -ex

# Use -gt 1 to consume two arguments per pass in the loop (e.g. each
# argument has a corresponding value to go with it).
# Use -gt 0 to consume one or more arguments per pass in the loop (e.g.
# some arguments don't have a corresponding value to go with it such
# as in the --default example).
while [[ $# -gt 1 ]]
do
key="$1"
case $key in
    -i|--input_dir)
    INPUT_DIR="$2"
    shift
    ;;
    -o|--output_dir)
    OUTPUT_DIR="$2"
    shift
    ;;
    *)  # unknown option
    ;;
esac
shift # past argument or value
done

echo Input Data From "${INPUT_DIR}"

cd ${INPUT_DIR}
for index in {1..5}
do
    if [[ -d "$OUTPUT_DIR" ]]; then
       mkdir $OUTPUT_DIR
    fi
            
done