diff --git a/actions/prepare-environment.sh b/actions/prepare-environment.sh
index 15fc802..7a58e76 100755
--- a/actions/prepare-environment.sh
+++ b/actions/prepare-environment.sh
@@ -29,12 +29,36 @@ source ./functions/vm.sh
 source ./functions/network.sh
 source ./functions/shell.sh
 
+# Check for the 'dumpkeys.cache' file
+echo -n "Checking for 'dumpkeys.cache'... "
+if ! [ -f dumpkeys.cache ]; then
+  echo
+  echo
+  echo "The file 'dumpkeys.cache' shouldn't be removed from the main directory!"
+  case "$(uname)" in
+    CYGWIN*)
+      echo "Please restore it from the sources, it can't be recreated on this operating system."
+    ;;
+    *)
+      echo "Please restore it from the sources, or it can recreated using this command:"
+      echo "  sudo dumpkeys --keys-only > dumpkeys.cache"
+      echo "The 'dumpkeys' and 'sudo' should be installed first using your package manager."
+    ;;
+  esac
+  echo "Aborting."
+  exit 1
+else
+  echo "OK"
+fi
+
 # Check for procps package
 if [ "$(execute uname -s | cut -c1-6)" = "CYGWIN" ]; then
   echo -n "Checking for 'free'... "
   execute type free >/dev/null 2>&1
   if [ $? -eq 1 ]; then
-    echo "\"free\" is not available in the path, but it's required. Please install the \"procps\" package. Aborting."
+    echo
+    echo
+    echo "'free' is not available in the path, but it's required. Please install the 'procps' package. Aborting."
     exit 1
   else
     echo "OK"
@@ -45,7 +69,9 @@ fi
 echo -n "Checking for 'expect'... "
 execute type expect >/dev/null 2>&1
 if [ $? -eq 1 ]; then
-  echo "\"expect\" is not available in the path, but it's required. Please install Tcl \"expect\" package. Aborting."
+  echo
+  echo
+  echo "'expect' is not available in the path, but it's required. Please install Tcl 'expect' package. Aborting."
   exit 1
 else
   echo "OK"
@@ -55,17 +81,21 @@ fi
 echo -n "Checking for 'xxd'... "
 execute type xxd >/dev/null 2>&1
 if [ $? -eq 1 ]; then
-  echo "\"xxd\" is not available in the path, but it's required. Please install the \"xxd\" package. Aborting."
+  echo
+  echo
+  echo "'xxd' is not available in the path, but it's required. Please install the 'xxd' package. Aborting."
   exit 1
 else
   echo "OK"
 fi
 
 # Check for VirtualBox
-echo -n "Checking for \"VBoxManage\"... "
+echo -n "Checking for 'VBoxManage'... "
 execute type VBoxManage >/dev/null 2>&1
 if [ $? -eq 1 ]; then
-  echo "\"VBoxManage\" is not available in the path, but it's required. Likely, VirtualBox is not installed. Aborting."
+  echo
+  echo
+  echo "'VBoxManage' is not available in the path, but it's required. Likely, VirtualBox is not installed. Aborting."
   exit 1
 else
   echo "OK"
@@ -75,9 +105,13 @@ fi
 echo -n "Checking for VirtualBox Extension Pack... "
 extpacks=`execute VBoxManage list extpacks | grep 'Usable' | grep 'true' | wc -l`
 if [ "$extpacks" -le 0 ]; then
-    echo >&2 "VirtualBox Extension Pack is not installed. Please, download and install it from the official VirtualBox web site at https://www.virtualbox.org/wiki/Downloads"; exit 1;
+  echo
+  echo
+  echo "VirtualBox Extension Pack is not installed. Please, download and install it from the official VirtualBox web site at https://www.virtualbox.org/wiki/Downloads"
+  exit 1;
+else
+  echo "OK"
 fi
-echo "OK"
 
 # execute some checks only in the 'launch' mode
 if [ $1 == "launch" ]; then
@@ -103,11 +137,14 @@ fi
 # Check for ISO image to be available
 echo -n "Checking for Mirantis OpenStack ISO image... "
 if [ -z $iso_path ]; then
-    echo "Mirantis OpenStack image is not found. Please download it from software.mirantis.com and put under the 'iso' directory."
-    exit 1
+  echo
+  echo
+  echo "Mirantis OpenStack image is not found. Please download it from software.mirantis.com and put under the 'iso' directory."
+  exit 1
+else
+  echo "OK"
+  echo "Going to use Mirantis OpenStack ISO file: $iso_path"
 fi
-echo "OK"
-echo "Going to use Mirantis OpenStack ISO file $iso_path"
 
 # Copy ISO to host
 copy_if_required $iso_path
@@ -118,6 +155,8 @@ fi # end 'launch' mode check
 echo -n "Checking if SSH client installed... "
 execute type ssh >/dev/null 2>&1
 if [ $? -eq 1 ]; then
+  echo
+  echo
   echo "SSH client is not installed. Please install the \"openssh\" package if you run this script under Cygwin. Aborting."
   exit 1
 else
@@ -128,6 +167,8 @@ echo -n "Checking if ipconfig or ifconfig installed... "
 case "$(execute uname)" in
   Linux | Darwin)
     if ! execute test -x /sbin/ifconfig ; then
+      echo
+      echo
       echo "No ifconfig available at /sbin/ifconfig path! This path is hard-coded into VBoxNetAdpCtl utility."
       echo "Please install ifconfig or create symlink to proper interface configuration utility. Aborting."
       exit 1
@@ -138,11 +179,15 @@ case "$(execute uname)" in
     # It uses built-in Windows ipconfig utility instead.
     execute type ipconfig >/dev/null 2>&1
     if [ $? -eq 1 ]; then
+      echo
+      echo
       echo "No ipconfig available in Cygwin environment. Please check you can run ipconfig from Cygwin command prompt. Aborting."
       exit 1
     fi
   ;;
   *)
+    echo
+    echo
     echo "$(execute uname) is not supported operating system."
     exit 1
   ;;
diff --git a/functions/memory.sh b/functions/memory.sh
index 68cd7a5..ce309ed 100755
--- a/functions/memory.sh
+++ b/functions/memory.sh
@@ -16,6 +16,8 @@
 
 # This file contains the functions to get available memory on host PC
 
+[ "$(basename ${0})" = "memory.sh" ] && exit 1
+
 source ./functions/shell.sh
 
 get_available_memory() {
diff --git a/functions/network.sh b/functions/network.sh
index 181ac91..3777479 100755
--- a/functions/network.sh
+++ b/functions/network.sh
@@ -16,6 +16,8 @@
 
 # This file contains the functions to manage host-only interfaces in the system
 
+[ "$(basename ${0})" = "network.sh" ] && exit 1
+
 source ./functions/shell.sh
 
 get_hostonly_interfaces() {
diff --git a/functions/product.sh b/functions/product.sh
index 52cb69f..4f6500f 100755
--- a/functions/product.sh
+++ b/functions/product.sh
@@ -18,6 +18,8 @@
 # and Fuel became operational, and also enabling outbound network/internet access for this VM through the
 # host system
 
+[ "$(basename ${0})" = "product.sh" ] && exit 1
+
 source ./functions/shell.sh
 
 ssh_options='-oConnectTimeout=5 -oStrictHostKeyChecking=no -oCheckHostIP=no -oUserKnownHostsFile=/dev/null -oRSAAuthentication=no -oPubkeyAuthentication=no'
diff --git a/functions/shell.sh b/functions/shell.sh
index 66f83b5..fb4b90f 100755
--- a/functions/shell.sh
+++ b/functions/shell.sh
@@ -18,6 +18,8 @@
 # Each command might be executed on the local machine or on the remote machine
 # depending on environment settings
 
+[ "$(basename ${0})" = "shell.sh" ] && exit 1
+
 function execute() {
   #  use shell substitution pattern ${parameter/pattern/string}, to escape spaces in arguments.
   if [ -n "$REMOTE_HOST" ]; then
diff --git a/functions/translate.sh b/functions/translate.sh
index 3a55858..a402538 100755
--- a/functions/translate.sh
+++ b/functions/translate.sh
@@ -16,11 +16,7 @@
 
 # This file contains the functions for AT translated set 2 encoder
 
-type xxd > /dev/null || exit 1
-
-if ! test -f dumpkeys.cache; then
-        sudo dumpkeys --keys-only > dumpkeys.cache
-fi
+[ "$(basename ${0})" = "translate.sh" ] && exit 1
 
 # XXX: hardcoded values are generated by:
 #make_break_shift="$(eval echo \$at_table_$(echo -n Shift | xxd -ps))"
@@ -31,69 +27,66 @@ make_shift=36
 break_shift=b6
 
 map_set() {
-        # $1 - keycode
-        # $2 - normal value
-        # $3 - shifted value
-        [ "${2}${3}" = "nulnul" ] && return 1
-        make=$(printf %02x "$1")
-        break=$(printf %02x "$(($1 | 128))")
-        eval "at_table_$(echo -n "${3#+}" | xxd -ps)='$make_shift $make $break $break_shift'"
-        eval "at_table_$(echo -n "${2#+}" | xxd -ps)='$make $break'"
+  # $1 - keycode
+  # $2 - normal value
+  # $3 - shifted value
+  [ "${2}${3}" = "nulnul" ] && return 1
+  make=$(printf %02x "$1")
+  break=$(printf %02x "$(($1 | 128))")
+  eval "at_table_$(echo -n "${3#+}" | xxd -ps)='$make_shift $make $break $break_shift'"
+  eval "at_table_$(echo -n "${2#+}" | xxd -ps)='$make $break'"
 }
 
 map_alias() {
-        # $1,$3,$5,... - names
-        # $2,$4,$6,... - aliases
-        while [ -n "$1" -a -n "$2" ]; do
-               eval "at_table_$(echo -n "${2#+}" | xxd -ps)=\${at_table_$(echo -n "${1#+}" | xxd -ps)}"
-               shift
-               shift
-        done
+  # $1,$3,$5,... - names
+  # $2,$4,$6,... - aliases
+  while [ -n "$1" -a -n "$2" ]; do
+    eval "at_table_$(echo -n "${2#+}" | xxd -ps)=\${at_table_$(echo -n "${1#+}" | xxd -ps)}"
+    shift
+    shift
+  done
 }
 
 # at_table_$normal = n
 # at_table_$shifted = n
 while read keycode n _ normal shifted rest; do
-        [ "$keycode" = "keycode" ] || continue
-        map_set "${n}" "${normal}" "${shifted}"
+  [ "$keycode" = "keycode" ] || continue
+  map_set "${n}" "${normal}" "${shifted}"
 done < dumpkeys.cache
 
 # Extra mapping
 map_alias \
-        one 1 exclam '!' \
-	two 2 at '@' \
-	three 3 numbersign '#' \
-	four 4 dollar '$' \
-	five 5 percent '%' \
-	six 6 asciicircum '^' \
-	seven 7 ampersand '&' \
-	eight 8 asterisk '*' \
-	nine 9 parenleft '(' \
-	zero 0 parenright ')' \
-	minus '-' underscore '_' \
-	equal '=' plus '+'
+  one 1 exclam '!' \
+  two 2 at '@' \
+  three 3 numbersign '#' \
+  four 4 dollar '$' \
+  five 5 percent '%' \
+  six 6 asciicircum '^' \
+  seven 7 ampersand '&' \
+  eight 8 asterisk '*' \
+  nine 9 parenleft '(' \
+  zero 0 parenright ')' \
+  minus '-' underscore '_' \
+  equal '=' plus '+'
 
 map_alias \
-        bracketleft '[' braceleft '{' \
-        bracketright ']' braceright '}' \
-        semicolon ';' colon ':' \
-        apostrophe "'" quotedbl '"' \
-        grave '`' asciitilde '~' \
-        backslash "\\" bar '|' \
-        comma ',' less '<' \
-        period '.' greater '>' \
-        slash '/' question '?' \
-        space ' ' Return $'\n'
+  bracketleft '[' braceleft '{' \
+  bracketright ']' braceright '}' \
+  semicolon ';' colon ':' \
+  apostrophe "'" quotedbl '"' \
+  grave '`' asciitilde '~' \
+  backslash "\\" bar '|' \
+  comma ',' less '<' \
+  period '.' greater '>' \
+  slash '/' question '?' \
+  space ' ' Return $'\n'
 
 translate() {
-        for t in $(echo -n "$*" | xxd -ps | sed -e 's/../& /g'); do
-                n="at_table_$t"
-                v="${!n}"
-                [ -z "$v" ] && echo "$0: unknown char: '$t'." >&2
-                echo -n " ${v}"
-        done
-        echo
+  for t in $(echo -n "$*" | xxd -ps | sed -e 's/../& /g'); do
+    n="at_table_$t"
+    v="${!n}"
+    [ -z "$v" ] && echo "$0: unknown char: '$t'." >&2
+    echo -n " ${v}"
+  done
+  echo
 }
-
-[ "$(basename "$0")" = "translate.sh" ] && translate " vmlinuz initrd=initrd.img biosdevname=0 ks=cdrom:/ks.cfg ip=10.20.0.2 gw=10.20.0.1 dns1=10.20.0.1 netmask=255.255.255.0 hostname=fuel.domain.tld showmenu=no
-"
diff --git a/functions/vm.sh b/functions/vm.sh
index aa96feb..60a9e8d 100755
--- a/functions/vm.sh
+++ b/functions/vm.sh
@@ -16,6 +16,8 @@
 
 # This file contains the functions to manage VMs in through VirtualBox CLI
 
+[ "$(basename ${0})" = "vm.sh" ] && exit 1
+
 source ./functions/shell.sh
 
 get_vm_base_path() {