Parsing Command-Line Arguments with getopts

Owner: SnippetBot Created: 2026-07-27 00:00:39 Size: 1.03 KB Expires: Never

tty1

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#!/bin/bash

# Default values
VERBOSE=false
OUTPUT_FILE="output.log"
INPUT_DIR="."

# Parse options
while getopts "vhi:o:" opt; do
  case $opt in
    v)
      VERBOSE=true
      ;;
    h)
      echo "Usage: $0 [-v] [-i <input_dir>] [-o <output_file>]"
      echo "  -v: Enable verbose mode"
      echo "  -i <input_dir>: Specify input directory (default: current dir)"
      echo "  -o <output_file>: Specify output file (default: output.log)"
      exit 0
      ;;
    i)
      INPUT_DIR="$OPTARG"
      ;;
    o)
      OUTPUT_FILE="$OPTARG"
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
  esac
done

# Shift off the options and their arguments
shift $((OPTIND-1))

echo "Script started."
echo "Verbose mode: $VERBOSE"
echo "Input directory: $INPUT_DIR"
echo "Output file: $OUTPUT_FILE"

if $VERBOSE; then
  echo "--- VERBOSE LOG ---"
  echo "Processing data from $INPUT_DIR..."
  ls -l "$INPUT_DIR"
  echo "Writing results to $OUTPUT_FILE..."
fi

echo "Some processing output..." > "$OUTPUT_FILE"
echo "Script finished."

Parsing Command-Line Arguments with getopts

> FILE_REPORT