diff --git a/debian-config.sh b/debian-config.sh
index 8eed0d6..e08f806 100755
--- a/debian-config.sh
+++ b/debian-config.sh
@@ -56,7 +56,7 @@ echo
 if [ -e /etc/ssh/sshd_config ]
 then
   echo "=== Disallow root login: #PermitRootLogin yes"
-  sed -i "s|^PermitRootLogin yes|#PermitRootLogin yes|g" /etc/ssh/sshd_config
+  sed -i "s|^PermitRootLogin |#PermitRootLogin |g" /etc/ssh/sshd_config
   service sshd restart
   echo
 fi
diff --git a/nixhome/.bashrc b/nixhome/.bashrc
index dc5377e..bb56a0a 100644
--- a/nixhome/.bashrc
+++ b/nixhome/.bashrc
@@ -58,6 +58,9 @@ then
   alias ll='ls -lGA' # show .xxx 
   alias dir='ls -lGA'
   alias lll='ls -lGa' # show .xxx and . and ..
+  alias grep='grep --color=auto'
+  alias fgrep='fgrep --color=auto'
+  alias egrep='egrep --color=auto'
   alias sedi='sed -i ""'
   export HOMEBREW_NO_AUTO_UPDATE=true
   export BASH_SILENCE_DEPRECATION_WARNING=1
@@ -66,6 +69,9 @@ else
   alias ll='ls -lA --color=auto'
   alias dir='ls -lA --color=auto'
   alias lll='ls -la --color=auto'
+  alias grep='grep --color=auto'
+  alias fgrep='fgrep --color=auto'
+  alias egrep='egrep --color=auto'
   alias sedi='sed -i'
   export TIME_STYLE='+%Y-%m-%d--%H:%M:%S' 
 fi
@@ -89,6 +95,50 @@ case "$TERM" in
 	;;
 esac
 
+############## following settings copied from amazon's debian ####################
+# set variable identifying the chroot you work in (used in the prompt below)
+if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
+    debian_chroot=$(cat /etc/debian_chroot)
+fi
+
+# set a fancy prompt (non-color, unless we know we "want" color)
+case "$TERM" in
+    xterm-color|*-256color) color_prompt=yes;;
+esac
+
+# uncomment for a colored prompt, if the terminal has the capability; turned
+# off by default to not distract the user: the focus in a terminal window
+# should be on the output of commands, not on the prompt
+#force_color_prompt=yes
+
+if [ -n "$force_color_prompt" ]; then
+    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
+	# We have color support; assume it's compliant with Ecma-48
+	# (ISO/IEC-6429). (Lack of such support is extremely rare, and such
+	# a case would tend to support setf rather than setaf.)
+	color_prompt=yes
+    else
+	color_prompt=
+    fi
+fi
+
+if [ "$color_prompt" = yes ]; then
+    PS1='[${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]] '
+else
+    PS1='[${debian_chroot:+($debian_chroot)}\u@\h:\w] '
+fi
+unset color_prompt force_color_prompt
+
+# If this is an xterm set the title to user@host:dir
+case "$TERM" in
+xterm*|rxvt*)
+    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
+    ;;
+*)
+    ;;
+esac
+############## above settings copied from amazon's debian ####################
+
 # nvm settings
 if [ -d $HOME/.nvm ]
 then