diff --git a/ECCOv4 Release 4/flux-forced/scripts/rename_offline_adj_diags_fn.sh b/ECCOv4 Release 4/flux-forced/scripts/rename_offline_adj_diags_fn.sh
new file mode 100644
index 0000000..b195022
--- /dev/null
+++ b/ECCOv4 Release 4/flux-forced/scripts/rename_offline_adj_diags_fn.sh	
@@ -0,0 +1,119 @@
+#!/bin/bash
+
+# Function to display the help message
+show_help() {
+    echo "Usage: $(basename $0) [DIRECTORY] [NUMBER]"
+    echo
+    echo "This script renames files in the specified directory (or current directory if not specified)."
+    echo "It changes the filenames based on a pattern where the last 15 characters"
+    echo "are a 10-digit number followed by '.data' or '.meta'."
+    echo "The script calculates a new 10-digit number which is NUMBER minus the old number."
+    echo "It will exit without renaming any files if a new filename already exists"
+    echo "or if the 10-digit number is larger than NUMBER."
+    echo "The new files are output to the same directory as the input files."
+    echo "You must confirm the action by typing 'YES' to proceed."
+    echo
+    echo "Arguments:"
+    echo "  DIRECTORY    Optional. The directory containing files to rename (default is current directory)."
+    echo "  NUMBER       Optional. The number to subtract from (default is 227639 [=nTimeSteps+1])."
+    echo
+    echo "Example:"
+    echo "  $(basename $0) /path/to/directory"
+    exit 1
+}
+
+# Default values
+# DEFAULT_NUMBER is set to nTimeSteps+1
+DEFAULT_NUMBER=227639
+DEFAULT_DIRECTORY=$(pwd)
+
+# Check for help option
+if [[ "$1" == "-h" || "$1" == "--help" ]]; then
+    show_help
+fi
+
+# Determine the directory and number
+DIRECTORY=$DEFAULT_DIRECTORY
+NUMBER=$DEFAULT_NUMBER
+
+if [ "$#" -ge 1 ]; then
+    if [[ -d $1 ]]; then
+        DIRECTORY=$1
+        shift
+    elif [[ $1 =~ ^[0-9]+$ ]]; then
+        NUMBER=$1
+        shift
+    else
+        echo "Invalid argument: $1"
+        show_help
+    fi
+fi
+
+if [ "$#" -ge 1 ]; then
+    if [[ $1 =~ ^[0-9]+$ ]]; then
+        NUMBER=$1
+    else
+        echo "Invalid number: $1"
+        show_help
+    fi
+fi
+
+# Function to ask for user confirmation
+confirm_action() {
+    echo "You are about to rename files in the following directory: $DIRECTORY"
+    echo "This will affect files where the last 15 characters are a 10-digit number followed by '.data' or '.meta'."
+    echo "The renamed files will be placed in a subdirectory named 'offline_adj_file_renamed_dir'."
+    echo "The renaming process will subtract each number from $NUMBER."
+    read -p "Are you sure you want to proceed? Type 'YES' to confirm: " confirmation
+    if [ "$confirmation" != "YES" ]; then
+        echo "Operation cancelled by user."
+        exit 1
+    fi
+}
+
+# Ask for user confirmation
+confirm_action
+
+# Create a subdirectory for the renamed files if it doesn't exist
+RENAME_DIR="$DIRECTORY/offline_adj_file_renamed_dir"
+mkdir -p "$RENAME_DIR"
+
+# Loop through files ending with ".data" or ".meta"
+for file in "$DIRECTORY"/*.{data,meta}
+do
+    # Check if the file matches the pattern (last 15 characters)
+    if [[ $file =~ ([0-9]{10})\.(data|meta)$ ]]
+    then
+        # Extract the 10-digit number and force it to be base 10
+        old_number=$((10#${BASH_REMATCH[1]}))
+
+        # Check if the old number is larger than NUMBER
+        if (( old_number > NUMBER )); then
+            echo "Error: The number $old_number in $file is larger than $NUMBER. Exiting."
+            exit 1
+        fi
+
+        # Calculate the new number
+        new_number=$((NUMBER - old_number))
+
+        # Ensure that the new number is 10 digits, formatted with leading zeros
+        formatted_new_number=$(printf "%010d" $new_number)
+
+        # Extract the directory path from the original file path
+        dir_path=$(dirname "$file")
+
+        # Form the new filename in the subdirectory
+        extension=${BASH_REMATCH[2]}
+        base_name=$(basename "$file")
+        new_file="${RENAME_DIR}/${base_name%_*}_${formatted_new_number}.${extension}"
+
+        # Check if the new file already exists
+        if [ -e "$new_file" ]; then
+            echo "Error: $new_file already exists. Exiting."
+            exit 1
+        fi
+
+        # Rename the file
+        mv "$file" "$new_file"
+    fi
+done