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diff --git a/install-nghdl.sh b/install-nghdl.sh
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+#!/bin/bash 
+#===============================================================================
+#
+#          FILE: install-nghdl.sh
+# 
+#         USAGE: ./install-nghdl.sh 
+# 
+#   DESCRIPTION: It is installation script for ngspice and ghdl work (nghdl). 
+# 
+#       OPTIONS: ---
+#  REQUIREMENTS: ---
+#          BUGS: ---
+#         NOTES: ---
+#        AUTHOR: Fahim Khan , fahim.elex@gmail.com
+#  ORGANIZATION: eSim, FOSSEE group at IIT Bombay
+#       CREATED: Tuesday 02 December 2014 17:01
+#      REVISION:  ---
+#===============================================================================
+
+ngspice="ngspice-26"
+src_loc=".esim-nghdl"
+config_file="config.ini"
+cur_dir=`pwd`
+
+#Will be used to take backup of any file
+sysdate="$(date)"
+timestamp=`echo $sysdate|awk '{print $3"_"$2"_"$6"_"$4 }'`
+
+
+#All functions goes here
+function addghdlPPA
+{
+        echo "Adding ghdl PPA to install latest ghdl version"
+        sudo add-apt-repository ppa:pgavin/ghdl
+        sudo apt-get update
+}
+
+function installDependency
+{
+        echo "Installing ghdl.................................."
+        sudo apt-get install ghdl
+        echo "Installing flex.................................."
+        sudo apt-get install flex
+        echo "Installing bison................................."
+        sudo apt-get install bison
+}
+
+echo "Enter proxy details if you are connected to internet thorugh proxy"
+
+echo -n "Is your internet connection behind proxy? (y/n): "
+read getProxy
+if [ $getProxy == "y" -o $getProxy == "Y" ];then
+        echo -n 'Proxy hostname :'
+        read proxyHostname
+
+        echo -n 'Proxy Port :'
+        read proxyPort
+
+        echo -n username@$proxyHostname:$proxyPort :
+        read username
+
+        echo -n 'Password :'
+        read -s passwd
+
+        unset http_proxy
+        unset https_proxy
+        unset HTTP_PROXY
+        unset HTTPS_PROXY
+        unset ftp_proxy
+        unset FTP_PROXY
+
+        export http_proxy=http://$username:$passwd@$proxyHostname:$proxyPort
+        export https_proxy=http://$username:$passwd@$proxyHostname:$proxyPort
+        export HTTP_PROXY=http://$username:$passwd@$proxyHostname:$proxyPort
+        export HTTPS_PROXY=http://$username:$passwd@$proxyHostname:$proxyPort
+        export ftp_proxy=http://$username:$passwd@$proxyHostname:$proxyPort
+        export FTP_PROXY=http://$username:$passwd@$proxyHostname:$proxyPort
+
+        echo "Install with proxy"
+        #Calling functions
+        addghdlPPA
+        installDependency
+
+elif [ $getProxy == "n" -o $getProxy == "N" ];then
+        echo "Install without proxy"
+
+        #Calling functions
+        addghdlPPA
+        installDependency
+
+        if [ $? -ne 0 ];then
+                echo -e "\n\n\nERROR: Unable to install required packages. Please check your internet connection.\n\n"
+                exit 0
+        fi
+
+else
+        echo "Please select the right option"
+        exit 0
+
+fi
+
+#Checking if ngspice-26 directory is already present in Home directory
+if [ -d $HOME/$ngspice ];then
+        echo "$ngspice directory already exist taking its backup"
+        mv $HOME/$ngspice $HOME/$ngspice.$timestamp
+fi
+
+
+#Extracting Ngspice to Home Directory
+tar -xzvf $ngspice.tar.gz -C $HOME
+
+if [ "$?" == 0 ];then 
+    echo "Ngspice extracted sucessfuly to $HOME "
+    #change to ngspice-26 directory
+    cd $HOME/$ngspice
+    #Make local install directory
+    mkdir -p install_dir
+    #Make release directory for build
+    mkdir -p release
+    #Change to release directory
+    cd release
+    echo "Installing Ngspice....."
+    echo "------------------------------------"  
+    sleep 5
+    ../configure --enable-xspice --disable-debug  --prefix=$HOME/$ngspice/install_dir/ --exec-prefix=$HOME/$ngspice/install_dir/    
+    make
+    make install
+    if [ "$?" == 0 ];then
+        echo "Ngspice Installed sucessfully"
+    else 
+        echo "There was some error in installing ngspice"
+    fi
+
+else 
+    echo "Unable to extract ngspice tar file"
+    exit 1;
+fi
+
+
+
+
+#Creating directory to put source 
+if [ -d "$HOME/$src_loc" ];then
+    echo "(.)esim-nghdl directory already in $HOME,removing it and copying new code"
+    rm -rf ~/$src_loc
+    mkdir -p ~/$src_loc
+else
+    mkdir -p ~/$src_loc
+fi
+
+#Change to current directory
+cd $cur_dir
+cp -rv src/* ~/$src_loc/
+
+#Copying LICENSE file
+cp LICENSE ~/$src_loc/
+
+#Creating config.ini file and adding configuration information
+
+cd ~/$src_loc/
+touch $config_file
+
+echo "[NGSPICE]" >> $config_file
+echo "NGSPICE_HOME = $HOME/$ngspice" >> $config_file
+echo "DIGITAL_MODEL = %(NGSPICE_HOME)s/src/xspice/icm/ghdl" >> $config_file
+echo "RELEASE = %(NGSPICE_HOME)s/release" >> $config_file
+
+
+## Creating softlink 
+cd /usr/local/bin
+if [[ -L nghdl ]];then
+    echo "Symlink was already present"
+    sudo unlink nghdl
+    sudo ln -sf ~/$src_loc/ngspice_ghdl.py nghdl
+
+else
+    echo "Creating synmlink"
+    sudo ln -sf ~/$src_loc/ngspice_ghdl.py nghdl
+fi
+
+