--- statistics_system.rb.orig   2012-09-14 10:59:40.000000000 +0200
+++ statistics_system.rb    2012-09-14 11:02:52.000000000 +0200
@@ -280,18 +280,27 @@
 puts; puts


+miss = []
+
 # -------------------------
 # --- system disk usage ---
 # -------------------------
 if which("pydf")
    system("pydf")
    puts
+elsif which("df")
+  puts blue("Disk usage")
+  system("df -h")
+  puts
+else
+  miss << "pydf"
 end

 # ---------------
 # --- battery ---
 # ---------------
-#if which("acpi")
+if which("acpi")
+  # pass
 #  bar = 40
 #  out = `acpi -V 2>/dev/null`
 #  if out.match(/^Battery.*[0-9]+/).to_s != "" then
@@ -307,18 +316,11 @@
 #  end
 #  puts out
 #  puts
-#end
+else
+  miss << "acpi"
+end


-# ------------------------------
-# --- check for dependencies ---
-# ------------------------------
-miss = []
-#comm = %w[ pydf acpi ]
-comm = %w[ pydf ]
-comm.each do |c|
-   if not which(c) then miss += [c] end
-end
 # print warning message about missing dependencies
 if miss.length > 0
    print "warning: the following commands missing: "