Add All existing

append

@@ -0,0 +1,64 @@
+#!/bin/bash
+
+# Usage info
+if [[ $# -lt 2 ]]; then
+    echo "Usage: $0 {front|back|ext|extension} <string> [folder]"
+    exit 1
+fi
+
+mode=$1
+string=$2
+folder=${3:-$(pwd)}
+
+# Ensure the folder exists
+if [[ ! -d "$folder" ]]; then
+    echo "Error: '$folder' is not a valid directory."
+    exit 1
+fi
+
+# Process files
+for file in "$folder"/*; do
+    [[ -f "$file" ]] || continue  # skip non-files
+    base="$(basename "$file")"
+
+    # Split filename into name and extension (if any)
+    name="${base%.*}"
+    ext="${base##*.}"
+
+    case "$mode" in
+        front)
+            # Add string to the front of the filename
+            newname="${string}${base}"
+            ;;
+        back)
+            # Add string before the extension (if present)
+            if [[ "$base" == "$ext" ]]; then
+                # no extension
+                newname="${name}${string}"
+            else
+                newname="${name}${string}.${ext}"
+            fi
+            ;;
+        ext|extension)
+            # Add string *to* the extension (after a dot)
+            if [[ "$base" == "$ext" ]]; then
+                # file has no extension
+                newname="${base}.${string}"
+            else
+                newname="${name}.${ext}${string}"
+            fi
+            ;;
+        *)
+            echo "Invalid mode: '$mode'. Use 'front', 'back', or 'ext/extension'."
+            exit 1
+            ;;
+    esac
+
+    # Avoid renaming collisions
+    if [[ "$newname" != "$base" ]]; then
+        echo "Renaming: $base -> $newname"
+        mv -n "$file" "$folder/$newname"
+    fi
+done
+
+echo "✅ All applicable files in '$folder' have been renamed."