如何根据文件名条件删除文件夹中的图像?

我需要根据以下条件删除JPG和JPG文件

文件夹有多个JPG和JPG文件。每个文件都以如下方式命名: 172.30.165.212_20241231_132125.JPG 在哪里 172.30.165.212 是IP地址, 20241231 是YYYYMMDD格式的日期,以及 132125 是HHMMSS格式的时间。

删除条件为:
1-脚本应始终根据文件名中的日期/时间保留每个IP地址的最新文件。无论日期/时间有多旧。
2-但是,由于每个IP地址可以有多个文件,脚本应该删除文件名中日期/时间比当前时间早2小时以上的所有文件。
3-永远不要查看文件的修改日期/时间,只查看名称中的日期/时间。

我尝试过,但没有成功,因为文件不会被删除。

#!/bin/bash
# Define target directory
TARGET_DIR="/mnt/moe/results"
# Log start time
echo "[$(date)] Starting cleanup process in $TARGET_DIR"

# Function to process files for a single IP
process_ip_files() {
    local ip_prefix=$1
    local ip_files
    # Find files matching the IP
    ip_files=$(find "$TARGET_DIR" -type f -iname "${ip_prefix}_*" | sort)

    # Skip if no files
    if [[ -z "$ip_files" ]]; then
        echo "No files found for IP: $ip_prefix"
        return
    fi

    echo "Processing IP: $ip_prefix"

    # Variables to track files and the most recent file
    local most_recent_file=""
    local most_recent_time=0
    local files_to_delete=()

    # Get current time in seconds since epoch
    current_time=$(date +%s)

    # Iterate over files to determine the most recent and deletion criteria
    while IFS= read -r file; do
        echo "Processing file: $file"

        # Remove the path and get just the file name
        base_file=$(basename "$file")
        echo "Base file name: $base_file"

        # Split file name into components
        IFS='_' read -r ip date time ext <<< "$base_file"
        
        # Validate the expected number of fields and format
        if [[ -z "$ip" || -z "$date" || -z "$time" || "$ext" != "JPG" && "$ext" != "jpg" ]]; then
            echo "  Skipping file (does not match expected format): $file"
            continue
        fi

        # Check the timestamp format (YYYYMMDD HHMMSS)
        if ! [[ "$date" =~ ^[0-9]{8}$ ]] || ! [[ "$time" =~ ^[0-9]{6}$ ]]; then
            echo "  Skipping file (invalid timestamp format): $file"
            continue
        fi

        # Convert to seconds since epoch
        timestamp="$date $time"
        file_time=$(date -d "$timestamp" +%s)

        echo "  File: $file"
        echo "    Timestamp: $timestamp"
        echo "    File time (epoch): $file_time"
        echo "    Current time (epoch): $current_time"

        # Check if this file is the most recent one for the IP
        if (( file_time > most_recent_time )); then
            # If we already have a most recent file, we add it to the delete list
            if [[ -n "$most_recent_file" ]]; then
                files_to_delete+=("$most_recent_file")
            fi
            most_recent_file="$file"
            most_recent_time="$file_time"
        else
            # Check if the file is older than 2 hours (7200 seconds)
            if (( current_time - file_time > 7200 )); then
                echo "    Marking for deletion: $file"
                files_to_delete+=("$file")
            fi
        fi
    done <<< "$ip_files"

    # Display the most recent file for this IP
    echo "Most recent file for IP $ip_prefix: $most_recent_file"

    # Deleting files not the most recent one
    if [[ ${#files_to_delete[@]} -gt 0 ]]; then
        echo "Files marked for deletion for IP $ip_prefix:"
        for file in "${files_to_delete[@]}"; do
            echo "  - $file"
        done

        for file in "${files_to_delete[@]}"; do
            if [[ "$file" != "$most_recent_file" ]]; then
                echo "Deleting file: $file"
                rm -v "$file"
            fi
        done
    else
        echo "No files to delete for IP $ip_prefix."
    fi
}

# Process unique IP addresses
find "$TARGET_DIR" -type f \( -iname "*.jpg" -o -iname "*.JPG" \) -printf "%f\n" | \
    awk -F'_' '{print $1}' | sort -u | while read -r ip; do
    process_ip_files "$ip"
done

# Log completion
echo "[$(date)] Cleanup process finished."

例如,我有以下文件,当前日期/时间为20241231 13:30

172.30.165.212_20241231_132125.JPG  
172.30.165.212_20241231_122125.JPG  
172.30.165.212_20241231_112125.JPG  
172.30.165.212_20241231_102125.JPG  
172.30.165.212_20241231_092125.JPG  
172.30.165.213_20241231_062125.JPG  
172.30.165.213_20241231_032125.JPG  
172.30.165.213_20241231_012125.JPG  

脚本应删除

172.30.165.212_20241231_112125.JPG (older than 2 hours)  
172.30.165.212_20241231_102125.JPG (older than 2 hours)  
172.30.165.212_20241231_092125.JPG (older than 2 hours)  
172.30.165.213_20241231_032125.JPG (older than 2 hours)  
172.30.165.213_20241231_012125.JPG (older than 2 hours)  

脚本应保留

172.30.165.212_20241231_132125.JPG  (younger than 2 hours)  
172.30.165.212_20241231_122125.JPG  (younger than 2 hours)  
172.30.165.213_20241231_062125.JPG  (older than 2 hours but most recent from this ip address)