diff --git a/client/lib/engine/bin/DiskLib.py b/client/lib/engine/bin/DiskLib.py
index dcde73f..e700cc4 100755
--- a/client/lib/engine/bin/DiskLib.py
+++ b/client/lib/engine/bin/DiskLib.py
@@ -722,39 +722,31 @@ def ogGetEsp():
 #@exception OG_ERR_NOTFOUND Disco o partición no corresponde con un dispositivo.
 #@note    Requisitos: sfdisk, sgdisk
 #*/ ##
-def ogGetLastSector(*args):
-    # Variables locales
-    DISK = None
-    PART = None
-    LASTSECTOR = None
+def ogGetLastSector (disk, par=None):
+    DISK = ogDiskToDev (disk)
+    if not DISK: return None
+    env = os.environ
+    env['LANG'] = 'C'
+    last = None
+    if par:
+        PART = ogDiskToDev (disk, par)
+        if not PART: return None
+        sgdisk_out = subprocess.run (['sgdisk', '-p', DISK], env=env, capture_output=True, text=True).stdout
+        for l in sgdisk_out.splitlines():
+            items = l.split()
+            if len(items) < 3: continue
+            if par != items[0]: continue
+            last = items[2]
+            break
 
-    # Si se solicita, mostrar ayuda.
-    if len(args) == 1 and args[0] == "help":
-        SystemLib.ogHelp("ogGetLastSector", "ogGetLastSector int_ndisk [int_npart]",
-               "ogGetLastSector 1  =>  488392064",
-               "ogGetLastSector 1 1  =>  102400062")
-        return
+    else:
+        sgdisk_out = subprocess.run (['sgdisk', '-p', DISK], env=env, capture_output=True, text=True).stdout
+        for l in sgdisk_out.splitlines():
+            if 'last usable sector' not in l: continue
+            items = l.split()
+            last = items[-1]
 
-    # Obtener último sector.
-    if len(args) == 1:  # Para un disco.
-        DISK = ogDiskToDev(args[0])
-        if DISK is None:
-            return
-        LASTSECTOR = subprocess.getoutput(f"sgdisk -p {DISK} | awk '/last usable sector/ {{print($(NF))}}'")
-    elif len(args) == 2:  # Para una partición.
-        DISK = ogDiskToDev(args[0])
-        if DISK is None:
-            return
-        PART = ogDiskToDev(args[0], args[1])
-        if PART is None:
-            return
-        LASTSECTOR = subprocess.getoutput(f"sgdisk -p {DISK} | awk -v P='{args[1]}' '{{if ($1==P) print $3}}'")
-    else:  # Error si se reciben más parámetros.
-        SystemLib.ogRaiseError(OG_ERR_FORMAT)
-        return
-
-    print(LASTSECTOR)
-    return
+    return last
 
 
 #/**
diff --git a/client/shared/functions/ogGetLastSector b/client/shared/functions/ogGetLastSector
new file mode 100755
index 0000000..4723660
--- /dev/null
+++ b/client/shared/functions/ogGetLastSector
@@ -0,0 +1,30 @@
+#!/usr/bin/python3
+
+import sys
+import argparse
+from SystemLib import ogHelp
+from DiskLib import ogGetLastSector
+
+if 2 == len (sys.argv) and 'help' == sys.argv[1]:
+    #parser.print_help() sale en inglés aunque la locale indique otra cosa
+    ogHelp ('ogGetLastSector', 'ogGetLastSector int_ndisk [int_npart]', ['ogGetLastSector 1'], ['ogGetLastSector 1 1'])
+    sys.exit (0)
+
+parser = argparse.ArgumentParser (add_help=False)
+if 2 == len (sys.argv):
+    parser.add_argument ('disk')
+elif 3 == len (sys.argv):
+    parser.add_argument ('disk')
+    parser.add_argument ('par')
+
+args = parser.parse_args()
+
+if 2 == len (sys.argv):
+    ret = ogGetLastSector (args.disk)
+elif 3 == len (sys.argv):
+    ret = ogGetLastSector (args.disk, args.par)
+
+if ret is not None:
+    if   ret == True: sys.exit (0)
+    elif ret == False: sys.exit (1)
+    else: print (ret)