diff --git a/README.md b/README.md
index ae9b3e5..25de709 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,12 @@
 Oracle Java Installer
 ====================
 
-Oracle java (jdk/jre) installler script for linux. It simplifies the installation of Oracle java from a [download](http://www.oracle.com/technetwork/java/javase/downloads/index.html)ed source (tar.gz). It also maintains consistency among multiple versions of java (jdk/jre) installed with this script. Uninstalling any java version installed with this script will fall back to the next most recently installed (with this script) version of java.
+Oracle java (jdk/jre) installler script for linux. It simplifies the installation of Oracle java from a [download](http://www.oracle.com/technetwork/java/javase/downloads/index.html)ed source (tar.gz). It also maintains consistency among multiple versions of java (jdk/jre). Uninstalling any java version installed with this script will fall back to the next most recently installed version of java.
 
 Install oraji:
 =====================
 
-Give the <span class="light-quote">install.sh</span> file execution permission and run it in terminal (with root privillege).
+Give the <span class="light-quote">install.sh</span> file execution permission and run it in terminal (with root privilege).
 
 ```sh
 sudo ./install.sh
@@ -36,9 +36,8 @@ Java Uninstallation Instruction:
 ============================
 
 1. Run `oraji -u` (or `path/to/oraji -u` if you didn't install the *oraji* script).
-2. It will ask for java version. An auto detected version is provided as suggestion. If that is correct, just hit <kbd>Enter</kbd> without making any changes.
-3. Otherwise if the java version provided by default isn't correct (this shouldn't happen), provide manually and then hit <kbd>Enter</kbd>.
-4. The version can be provided as command line argument too i.e `oraji -u version` (or `/path/to/oraji -u version` if you didn't install the script).
+2. Choose the version to be uninstalled from the list.
+3. The version can be provided as command line argument too i.e `oraji -u version` (or `/path/to/oraji -u version` if you didn't install the script).
 
 **Note:**
 
@@ -48,20 +47,58 @@ Java Uninstallation Instruction:
 
 **N.B:** The uninstallation method is only for the oracle java installed with the `oraji` script. It deletes the `/usr/lib/jvm/jdk|jre<version_number>` directory and all exports and environment variables that was included in */etc/profile* by oraji and the mozilla plugin. If a fall back java is available, exports and environment variables will be available for this java version and mozilla plugin will be restored.
 
+
+Manage multiple Java versions:
+===========================
+You can install multiple Java versions and set whichever version you want as your current Java.
+
+To check which version of Java is currently active (with all other available Java versions) run:
+
+```sh
+oraji -c
+```
+
+To activate a Java version, run:
+
+```sh
+sudo oraji -s
+```
+and select the version from the list.
+
+
+Options:
+=======
+
+Option | Alt. Option | Details
+---- | ------ | -----
+`-v` | `--version`    | Show version
+`-h` | `--help`       | Show help
+`-i` | `--install`    | Install from a archive path
+`-u` | `--uninstall`  | Uninstall java
+`-s` | `--set`        | Set a java version
+`-c` | `--check`      | Show the installed java versions
+
+
 #ChangeLog:
 
-###`3.0.0`: <span class="light-quote">Tue Dec 22 19:32:07 UTC 2015</span>
+###`4.1.0`: <span class="light-quote">Tue Aug 23 23:38:01 UTC 2016</span>
 
-1. Improved portability.
-2. Lot's of bug fixed.
-3. Comprehensive install of java which makes it usable for java developers.
+1. `-s` option to activate an installed Java version
+2. `-c` option to check installed Java version
+3. `-h` option for help
+4. `-i` option for an alternative to provide archive path
 
-###`3.0.1`: <span class="light-quote">Tue Dec 22 20:58:42 UTC 2015</span>
+###`4.0.2`: <span class="light-quote">Sat Jan  9 16:16:23 UTC 2016</span>
 
-1. Added some extra environment variables besides JAVA_HOME.
-2. Updated PATH environment variables with some new paths.
-3. JAVA_HOME is no longer deleted by uninstall script.
-4. Multiple java version management.
+1. Improved environment variable management for multiple java version.
+2. Minor bug fix.
+3. Manual added. Can be accessed with `man oraji`.
+
+###`4.0.1`: <span class="light-quote">Wed Dec 23 04:34:25 UTC 2015</span>
+
+1. Input prompt improved.
+2. tilde (~) expansion supported in input prompt.
+3. Minor bug fix
 
 ###`4.0.0`: <span class="light-quote">Tue Dec 22 23:37:16 UTC 2015</span>
 
@@ -74,17 +111,18 @@ Java Uninstallation Instruction:
 6. `oraji -u` to uninstall java.
 7. Internal multiple java version management.
 
-###`4.0.1`: <span class="light-quote">Wed Dec 23 04:34:25 UTC 2015</span>
+###`3.0.1`: <span class="light-quote">Tue Dec 22 20:58:42 UTC 2015</span>
 
-1. Input prompt improved.
-2. tilde (~) expansion supported in input prompt.
-3. Minor bug fix
+1. Added some extra environment variables besides JAVA_HOME.
+2. Updated PATH environment variables with some new paths.
+3. JAVA_HOME is no longer deleted by uninstall script.
+4. Multiple java version management.
 
-###`4.0.2`: <span class="light-quote">Sat Jan  9 16:16:23 UTC 2016</span>
+###`3.0.0`: <span class="light-quote">Tue Dec 22 19:32:07 UTC 2015</span>
 
-1. Improved environment variable management for multiple java version.
-2. Minor bug fix.
-3. Manual added. Can be accessed with `man oraji`.
+1. Improved portability.
+2. Lot's of bug fixed.
+3. Comprehensive install of java which makes it usable for java developers.
 
 Tested OS:
 =============
diff --git a/oraji b/oraji
index f6bc04e..3042be2 100644
--- a/oraji
+++ b/oraji
@@ -1,6 +1,6 @@
 #!/bin/bash
 project="oraji"
-version="4.0.2"
+version="4.1.0"
 author="Md. Jahidul Hamid"
 source="https://github.com/neurobin/$project"
 bug_report="$source/issues"
@@ -11,20 +11,41 @@ Author     : $author
 Source     : $source
 Bug report : $bug_report
 "
-
-[[ $1 == "-v" || $1 == "--version" ]] && { echo "$version_info";exit 0; }
+help="
+########################## $project #############################
+# Usage:
+#   install java    : sudo oraji 'jdk_or_jre_archive_path'
+#   install java    : sudo oraji -i 'jdk_or_jre_archive_path'
+#   uninstall java  : sudo oraji -u jdk|jre<version_number>
+#
+# Options:
+#   [ -v, --version ]   : Show version
+#   [ -h, --help ]      : Show help
+#   [ -i, --install ]   : Install from a archive path
+#   [ -u, --uninstall ] : Uninstall java
+#   [ -s, --set ]       : Set a java version
+#   [ -c, --check ]     : Show the installed java versions
+##############################################################
+"
 
 shopt -s extglob
 
-if [ $EUID -ne 0 ]; then
-    echo "
-    *********This script must be run with root privilege*********
-    *******************Sorry! Abort!*****************************
-    "
-    exit 1
-fi
+####################################### General functions ######################################
+
+err(){
+     echo "E: oraji: $@" >> /dev/stderr
+}
 
-####################################### Expand path function ######################################
+
+chkroot(){
+    if [ x$EUID != x0 ]; then
+        err "
+        This script must be run with root privilege
+        *Sorry! Abort!**
+        "
+        exit 1
+    fi
+}
 
 expandPath() {
   local path
@@ -68,12 +89,12 @@ expandPath() {
   printf -v result '%s:' "${resultPathElements[@]}"
   printf '%s\n' "${result%:}"
 }
-####################################### Expand path function ######################################
+####################################### General functions end ######################################
 
 ################# Path Managing functions #####################################
 disableJavaPath(){
 jpath="$1"
-pat="$(echo "$jpath" |sed 's/[^^]/[&]/g; s/\^/\\^/g')"
+pat="$(echo "$jpath" |sed -e 's/[^^]/[&]/g' -e 's/\^/\\^/g')"
 sed -e "s/^[[:blank:]]*export[[:blank:]]*J2SDKDIR[=]$pat/# &/" \
     -e "s/^[[:blank:]]*export[[:blank:]]*J2REDIR[=]$pat/# &/" \
     -e  "s/^[[:blank:]]*export[[:blank:]]*PATH[=]\$PATH[:]$pat/# &/" \
@@ -95,13 +116,13 @@ sed -e  "s/^[[:blank:]]*#[[:blank:]]*\(export[[:blank:]]*J2SDKDIR[=]$pat.*\)/\1/
 
 deleteJavaPath(){
 jpath="$1"
-[[ ! $jpath =~ ^/usr/lib/jvm/j(dk|re).* ]] && { echo "E: argument to deletePath is invalid"; exit 1; }
+[[ ! $jpath =~ ^/usr/lib/jvm/j(dk|re).* ]] && { err "E: argument to deletePath is invalid"; exit 1; }
 pat="$(echo "$jpath" |sed 's/[^^]/[&]/g; s/\^/\\^/g')"
-sed -e "/^[[:blank:]]*export[[:blank:]]*J2SDKDIR[=]$pat/d" \
-    -e "/^[[:blank:]]*export[[:blank:]]*J2REDIR[=]$pat/d" \
-    -e  "/^[[:blank:]]*export[[:blank:]]*PATH[=]\$PATH[:]$pat/d" \
-    -e  "/^[[:blank:]]*export[[:blank:]]*JAVA_HOME[=]$pat/d" \
-    -e  "/^[[:blank:]]*export[[:blank:]]*DERBY_HOME[=]$pat/d" \
+sed -e "/^[[:blank:]]*#*[[:blank:]]*export[[:blank:]]*J2SDKDIR[=]$pat/d" \
+    -e "/^[[:blank:]]*#*[[:blank:]]*export[[:blank:]]*J2REDIR[=]$pat/d" \
+    -e  "/^[[:blank:]]*#*[[:blank:]]*export[[:blank:]]*PATH[=]\$PATH[:]$pat/d" \
+    -e  "/^[[:blank:]]*#*[[:blank:]]*export[[:blank:]]*JAVA_HOME[=]$pat/d" \
+    -e  "/^[[:blank:]]*#*[[:blank:]]*export[[:blank:]]*DERBY_HOME[=]$pat/d" \
     --in-place /etc/profile
 }
 
@@ -169,54 +190,69 @@ installJavaPaths(){
     . /etc/profile >/dev/null &&
     echo "
     ***environment variables updated successfully***" ||
-    echo "
+    err "
     ---Failed to update environment variables"
 
 }
 
+getJName(){
+    while IFS=  read -r -d $'\0'; do
+    array+=("$REPLY")
+    done < <(find /usr/lib/jvm -maxdepth 1 -type d \( -name 'jdk*' -o -name 'jre*' \) -printf "%P\0")
+
+    echo "Choice    Version" >>/dev/stderr
+    for((i=0;i<${#array[@]};i++));do
+        echo "$i.       ${array[$i]}" >>/dev/stderr
+    done
+
+    arri=""
+    while [[ ! "$arri" =~ ^[0-9]+$ ]];do
+        read -r -p "Enter your choice: " arri
+    done
+    echo "${array[arri]}"
+}
+
 ################# Path Managing functions #####################################
 
+
 ####################################### Uninstall function ########################################
 uninstall(){
     shopt -s extglob
     
     jname="$1"
     
-    [[ $jname =~ ^(jdk|jre).* || ! -d /usr/lib/jvm/$jname ]] && { echo "
-    ---Invalid java name/version.---"; exit 2; }
-    
-    [[ $jname == "" ]] && 
-    {
-    if update-alternatives --display java >/dev/null 2>&1;then
-        jname="$(update-alternatives --display  java |grep -oE 'points\s*to\s*/usr/lib/jvm/[^/]*')"
-        jname="${jname##*/}"
-        read -e -i "$jname" -p "Enter the java version (with jdk/jre): " jname
-    else
-        read -e -i "$jname" -p "Enter the java version (with jdk/jre): " jname
-    fi
-    }
+    [[ $jname == "" ]] && jname="$(getJName)"
+    #{
+    #if update-alternatives --display java >/dev/null 2>&1;then
+    #    jname="$(update-alternatives --display  java |grep -oE 'points\s*to\s*/usr/lib/jvm/[^/]*')"
+    #    jname="${jname##*/}"
+    #    read -e -i "$jname" -p "Enter the java version (with jdk/jre): " jname
+    #else
+    #    read -e -i "$jname" -p "Enter the java version (with jdk/jre): " jname
+    #fi
+    #}
     
     [[ -d /usr/lib/jvm/"$jname" ]] || 
     { 
-    printf "%s\n" "
+    err "
     -----Directory not found: /usr/lib/jvm/$jname-----
     "; exit 3;
     }
+
     
-    
-    [[ $jname == "" || $jname =~ \/ ]] && echo "
+    [[ $jname == "" || $jname =~ \/ ]] && err "
     ------java name can not be empty or contain /------" && exit 4
     ##variable jname is safe to use now.
     
     patt="^(jdk|jre).*"
-    [[ $jname =~ $patt ]] || { echo "
+    [[ $jname =~ $patt ]] || { err "
     ------Couldn't recognize java name/version------";exit 5; }
     jgenre="${BASH_REMATCH[1]}"   ## whether it's jdk or jre
     doing=false;
     for prog in /usr/lib/jvm/"$jname"/bin/*;do
         progn="${prog##*/}"
         [[ $progn == *"."* ]] && continue
-        if [[ -f $prog ]];then
+        if [[ -f "$prog" ]];then
             update-alternatives --remove "$progn" "/usr/lib/jvm/$jname/bin/$progn"
             doing=true
         fi
@@ -233,14 +269,14 @@ uninstall(){
     source /etc/profile >/dev/null &&
     echo "
     ***Removed java environment variables***" ||
-    echo "
+    err "
     ---Failed to remove java environment variables"
     
     ##We will remove mozilla plugins for only the active java version.
     if $doing;then 
         rm ~/.mozilla/plugins/libnpjp2.so && echo "
     ***Mozilla plugin removed***" ||
-        echo "
+        err "
     ---Mozilla plugin not found (ignore this error)---" # optional
     fi
     
@@ -264,7 +300,7 @@ uninstall(){
         source /etc/profile >/dev/null &&
         echo "
     ***Environment variables restored for Fall-Back java***" ||
-        echo "
+        err "
     ---Couldn't restore environment variables for Fall-Back java---"
         
         [[ $jname =~ ^jdk ]] && ln -sf /usr/lib/jvm/$jname/jre/lib/$arch/libnpjp2.so ~/.mozilla/plugins/ ||
@@ -272,7 +308,7 @@ uninstall(){
         [[ $jname =~ ^jre ]] && ln -sf /usr/lib/jvm/$jname/lib/$arch/libnpjp2.so ~/.mozilla/plugins/
         } && echo "
     ***Mozilla plugin restored for fall back java version***" ||
-        echo "
+        err "
     ---Couldn't restore mozilla plugin. Restore it manually if needed.
     For jdk: ln -sf /usr/lib/jvm/jdk<version_number>/jre/lib/your_arch/libnpjp2.so ~/.mozilla/plugins/
     For jre: ln -sf /usr/lib/jvm/jre<version_number>/lib/your_arch/libnpjp2.so ~/.mozilla/plugins/"
@@ -292,39 +328,110 @@ uninstall(){
 }
 ####################################### Uninstall function ########################################
 
-[[ $1 == "-u" ]] && { uninstall "$2";exit 0; }
 
-jpath="$1"
+####################################### Opt parse ######################################################
+ustall=false
+ustall_jname=""
+set=false
+sname=""
+jpath=""
+while (( $# > 0 )); do
+    case "$1" in
+        -v|--version)
+             echo "$version_info"
+            exit 0
+            ;;
+        -h|--help)
+             echo "$help"
+            exit 0
+            ;;
+        -c|--check)
+            echo "
+    Current Java:
+            "
+            update-alternatives --display java 2>&1 |grep 'point' |sed -n 's#.*/\(j\(dk\|re\)[^/]*\)/.*#\1#p'
+            echo "
+    Available Java:
+            "
+            find /usr/lib/jvm -maxdepth 1 -type d \( -name 'jdk*' -o -name 'jre*' \) -printf "%P\n"
+            exit 0
+            ;;
+        -u|--ustall)
+            $set && { err "More than one action is not permitted"; exit 1; }
+            ustall=true
+            ustall_jname="$2"
+            [[ "$jpath" != "" || "$ustall_jname" = -* ]] && { err "Invalid arg for uninstall option"; exit 1; }
+            chkroot
+            uninstall "$ustall_jname"
+            exit 0
+            shift
+            ;;
+        -s|--set)
+            $ustall && { err "More than one action is not permitted"; exit 1; }
+            set=true
+            if [[ "$2" != "" ]]; then
+                sname="$2"
+                shift
+            else
+                sname="$(getJName)"
+            fi
+            ;;
+        -i|--install|*)
+            $ustall && { err "Can't install and uninstall at the same time, choose one."; exit 1; }
+            $set && { err "Can't set and install at the same time, choose one."; exit 1; }
+            if [[ "$1" = -i || "$1" = --install ]];then
+                [[ "$jpath" = "" ]] && jpath="$2" || { err "More than one archive path given"; exit 1; }
+                shift
+            else
+                [[ "$jpath" = "" ]] && jpath="$1" || { err "More than one archive path given"; exit 1; }
+            fi
+            [[ "$jpath" = "" ]] && { err "Archive path missing. Usage: oraji -i archive_path"; exit 1; }
+    esac
+    shift
+done
+####################################### Opt parse ######################################################
 
-#mytty=$(tty)
+##################
+## check for root
+chkroot
 
-[[ $jpath == "" ]] && read -e -p "Enter the java archive path: " jpath && jpath="$(expandPath "$jpath")"
+if ! $set; then
+    [[ $jpath == "" ]] && read -e -p "Enter the java archive path: " jpath && jpath="$(expandPath "$jpath")"
 
-##Validate jpath
+    ##Validate jpath
 
-[[ ! $jpath =~ .*(jdk|jre).*\.tar\..* ]] && { echo "Failed to recognize archive: $jpath";exit 2;}
-[[ -d $jpath ]] && { echo "You must pass an archive file, not a directory";exit 2; }
-[[ ! -f $jpath ]] && { echo "No such file: $jpath";exit 2;}
+    [[ ! $jpath =~ .*(jdk|jre).*\.tar\..* ]] && { err "Failed to recognize archive: $jpath";exit 2;}
+    [[ -d $jpath ]] && { err "You must pass an archive file, not a directory";exit 2; }
+    [[ ! -f $jpath ]] && { err "No such file: $jpath";exit 2;}
 
-tmpdir="$(mktemp -d)"
+    tmpdir="$(mktemp -d)"
 
-tar -xvf "$jpath" -C "$tmpdir" || { echo "Failed to extract archive"; exit 2; }
+    tar -xvf "$jpath" -C "$tmpdir" || { err "Failed to extract archive"; exit 2; }
 
-cd "$tmpdir"/j* || { echo "Couldn't find java directory"; exit 3; }
-jname="${PWD##*/}"
-patt="^(jdk|jre).*"
-[[ $jname =~ $patt ]]
-jgenre="${BASH_REMATCH[1]}"   ## whether it's jdk or jre
+    cd "$tmpdir"/j* || { err "Couldn't find java directory"; exit 3; }
+    jname="${PWD##*/}"
 
-[[ $jname != "" && $tmpdir != "" ]] || 
-{ echo "
------Variable jname/tmpdir can not be empty-----
-Please file a bug report with all available terminal output and info at:
-$bug_report
-"; exit 4; }
+    [[ $jname != "" && $tmpdir != "" ]] || 
+    { err "
+    -----Variable jname/tmpdir can not be empty-----
+    Please file a bug report with all available terminal output and info at:
+    $bug_report
+    "; exit 4; }
 
-mkdir -p /usr/lib/jvm/"$jname"
-mv -f ./* -t /usr/lib/jvm/"$jname"
+    mkdir -p /usr/lib/jvm/"$jname"
+    mv -f ./* -t /usr/lib/jvm/"$jname"
+else
+    jname="$sname"
+fi
+#### File copied successfully
+
+while [[ "$jname" = "" ]]; do
+    read -p "Enter the java version (with jdk/jre): " jname
+done
+
+patt="^(jdk|jre).*"
+[[ $jname =~ $patt ]] || { err "Couldn't recognize java name/version";exit 5; }
+jgenre="${BASH_REMATCH[1]}"   ## whether it's jdk or jre
 
 pr=22222  ## priority
 
@@ -342,6 +449,9 @@ if update-alternatives --display java >/dev/null 2>&1;then
 fi
 
 ##Now install all available binaries with `update-alternatives --install` and set them to be used
+
+[[ -d "/usr/lib/jvm/$jname" ]] || { err "No such directory: /usr/lib/jvm/$jname"; exit 1; }
+
 for prog in /usr/lib/jvm/"$jname"/bin/*;do
     progn="${prog##*/}"
     [[ $progn == *"."* ]] && continue
@@ -384,7 +494,7 @@ if echo "$(java -version 2>&1)" |grep -qsi "java version.*$jv" ; then
     fi
     (( $? == 0)) && echo "
     ***Managed mozilla plugin successfully***" ||
-    echo "
+    err "
     ---Failed to manage mozilla plugin. If you think it's necessary run 
     ln -sf /usr/lib/jvm/$jname/jre/lib/your-system-architecture-here/libnpjp2.so ~/.mozilla/plugins/  #For jdk and
     ln -sf /usr/lib/jvm/$jname/lib/your-system-architecture-here/libnpjp2.so ~/.mozilla/plugins/      #For jre
@@ -399,6 +509,6 @@ if echo "$(java -version 2>&1)" |grep -qsi "java version.*$jv" ; then
     (To populate environment variables immediately run 'source /etc/profile' manually)
     "
 else
-    echo "-----Failed to install java. Run 'java -version' manually to confirm.----"
+    err "-----Failed to install java. Run 'java -version' manually to confirm.----"
 fi
 
diff --git a/oraji.1 b/oraji.1
index c61bfcb..fc67aa6 100644
--- a/oraji.1
+++ b/oraji.1
@@ -6,7 +6,7 @@ oraji - Oracle Java Installer
 .SH "SYNOPSIS"
 .B oraji
 .I path/to/the/jdk_or_jre_archive
-.IP "oraji [-u, -v]"
+.IP "oraji [-i, -u, -c, -s, -h, -v]"
 .SH DESCRIPTION
 Oracle Java (jdk/jre) installler script for Linux. It simplifies the installation of Oracle Java from a downloaded source (tar.gz). It also maintains consistency among multiple versions of Java (jdk/jre) installed with this script. Uninstalling any Java version installed with this script will fall back to the next most recently installed (with this script) version of Java.
 
@@ -32,9 +32,11 @@ Uninstalls Java installed with oraji. An extra argument can be passed with this
 .B oraji -u
 and confirm the version, it's safe.
 .IP "-s, --set"
-Takes a second parameter as java version in the form: jdk|jre<version_number> (e.g jdk1.8.0_92) and sets this version of java as the active one.
+Takes an optional second parameter as java version in the form: jdk|jre<version_number> (e.g jdk1.8.0_92) and sets this version of java as the active one. If the second parameter is not given, a selection menu will be presented.
+.IP "-c, --check"
+Display the available java versions as well as the currently active one.
 .IP "-v, --version"
-shows the version number.
+Shows version info.
 .IP "-h, --help"
 Show help