new_script.sh

#!/bin/bash

# Function to display help message
show_help() {
    echo "Usage: $0 [OPTIONS]"
    echo "Options:"
    echo "  --help, -h            Display this help message"
    echo "  --date, -d            Display the current date and time"
    echo "  --list, -l <path>     List files in the specified directory"
    echo "  --count, -c <file>    Count the number of lines in the specified file"
    exit 0
}

# Function to display the current date and time
show_date() {
    echo "Current date and time: $(date)"
    exit 0
}

# Function to list files in a directory
list_files() {
    if [ -d "$1" ]; then
        echo "Files in directory $1:"
        ls -l "$1"
    else
        echo "Error: $1 is not a valid directory."
        exit 1
    fi
    exit 0
}

# Function to count lines in a file
count_lines() {
    if [ -f "$1" ]; then
        echo "Number of lines in file $1: $(wc -l < "$1")"
    else
        echo "Error: $1 is not a valid file."
        exit 1
    fi
    exit 0
}

# Handle command-line arguments
if [ "$#" -eq 0 ]; then
    echo "Error: No arguments provided. Use --help or -h for usage information."
    exit 1
fi

while [ "$#" -gt 0 ]; do
    case "$1" in
        --help|-h)
            show_help
            ;;
        --date|-d)
            show_date
            ;;
        --list|-l)
            if [ -z "$2" ]; then
                echo "Error: Missing directory path for --list or -l."
                exit 1
            fi
            list_files "$2"
            shift
            ;;
        --count|-c)
            if [ -z "$2" ]; then
                echo "Error: Missing file path for --count or -c."
                exit 1
            fi
            count_lines "$2"
            shift
            ;;
        *)
            echo "Error: Invalid option $1. Use --help or -h for usage information."
            exit 1
            ;;
    esac
    shift
done