reverse-scp.sh - This script lists remote files, lets the user select them, and downloads them via SCP.

reverse-scp.sh

#!/bin/bash

# Function to display help message
show_help() {
    echo "Usage: $0 [REMOTE_USER REMOTE_HOST REMOTE_DIR]"
    echo
    echo "Arguments:"
    echo "  REMOTE_USER    SSH username for the remote connection"
    echo "  REMOTE_HOST    Remote host (IP or domain)"
    echo "  REMOTE_DIR     Directory on the remote server"
    echo
    echo "If no arguments are provided, the script will prompt for input."
    exit 0
}

# Check if help flag is passed
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
    show_help
fi

# Assign command-line arguments or prompt for missing parameters
if [[ -n "$1" ]]; then
    REMOTE_USER="$1"
else
    read -rp "Enter SSH username: " REMOTE_USER
fi

if [[ -n "$2" ]]; then
    REMOTE_HOST="$2"
else
    read -rp "Enter Remote Host (IP/Domain): " REMOTE_HOST
fi

if [[ -n "$3" ]]; then
    REMOTE_DIR="$3"
else
    read -rp "Enter Remote Directory Path: " REMOTE_DIR
fi

# Validate input
if [[ -z "$REMOTE_USER" || -z "$REMOTE_HOST" || -z "$REMOTE_DIR" ]]; then
    echo "Error: All parameters (REMOTE_USER, REMOTE_HOST, REMOTE_DIR) are required!"
    exit 1
fi

# List files on the remote machine
echo "Fetching file list from ${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_DIR}..."
FILES=$(ssh "${REMOTE_USER}@${REMOTE_HOST}" "ls -p ${REMOTE_DIR} | grep -v /")

if [[ -z "$FILES" ]]; then
    echo "No files found in the remote directory!"
    exit 1
fi

# Display file list with numbers
echo "Available files:"
IFS=$'\n' FILE_ARRAY=($FILES)
for i in "${!FILE_ARRAY[@]}"; do
    echo "$((i+1))). ${FILE_ARRAY[$i]}"
done

# Ask user to choose files
echo "Enter the numbers of the files you want to download (comma-separated, e.g., 1,3,5):"
read -r SELECTION

# Parse selection
IFS=',' read -r -a SELECTED_INDICES <<< "$SELECTION"
SELECTED_FILES=()
for index in "${SELECTED_INDICES[@]}"; do
    if [[ "$index" =~ ^[0-9]+$ ]] && (( index > 0 && index <= ${#FILE_ARRAY[@]} )); then
        SELECTED_FILES+=("${FILE_ARRAY[$((index-1))]}")
    else
        echo "Invalid selection: $index"
    fi
done

# Download selected files using SCP
if [[ ${#SELECTED_FILES[@]} -eq 0 ]]; then
    echo "No valid files selected. Exiting."
    exit 1
fi

echo "Downloading selected files..."
for FILE in "${SELECTED_FILES[@]}"; do
    scp "${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_DIR}/${FILE}" .
done

echo "Download completed!"