parse splits, rename if only one split

files/archive-subfolders

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-VERSION="20250208"
+VERSION="20250214"
 
 function helpexit() {
     BS=$( basename "$0" )
@@ -93,6 +93,12 @@ for ((i=1; i<=${#@}; i++)) {
 which pv &>/dev/null || { echo pv command missing; exit 1; }
 if [[ -n "$SPLIT" ]]; then
   which split &>/dev/null || { echo split command missing; exit 1; }
+  if [[ "$SPLIT" =~ ^[0-9]+$ ]] || [[ "$SPLIT" =~ ^[0-9]+[KMGTPEZ]$ ]] || [[ "$SPLIT" =~ ^[0-9]+[KMGTPEZ]B$ ]]; then
+     true
+   else
+     echo "Cannot parse: $SPLIT. use ex. 500G.  valid extension K M G T P E Z"
+     exit 1
+  fi
 fi
 if tar --version | grep -q GNU; then
   SORTFILES="--sort=name"
@@ -136,6 +142,13 @@ for d in "${REALFOLDERS[@]}"; do
         -d "$NEWEST" \
         "$d.${SUFFIX}".*[0123456789] \
         "$d.${SUFFIX}.lst"
+      shopt -s nullglob
+      set -- "$d.${SUFFIX}".*[0123456789]
+      if [[ $# -eq 1 ]]; then
+         echo "Split produced only one file:"
+         mv -v "$d.${SUFFIX}".*[0123456789] "$d.${SUFFIX}"
+      fi
+      shopt -u nullglob
     else
       touch \
         -d "$NEWEST" \