diff --git a/lib/asdf.sh b/lib/asdf.sh
index b74bc2c1..62fbdbf4 100755
--- a/lib/asdf.sh
+++ b/lib/asdf.sh
@@ -1,11 +1,3 @@
-#!/usr/bin/env sh
-
-#TODO run command with args
-
-#TODO decide which function to run based on args
-
-ASDF_DIR=$(dirname $0)
-
 run_command() {
   run_callback_if_command "--version" $1 asdf_version     "${@:2}"
   run_callback_if_command "install"   $1 install_command  "${@:2}"
@@ -20,12 +12,25 @@ run_command() {
 
 
 install_command() {
-  local source_path=$(get_source_path $1)
+  local package=$1
+  local version=$2
+  local source_path=$(get_source_path $package)
+
   check_if_source_exists $source_path
-  echo "TODO"
+
+  local install_path=$(get_install_path $package $version)
+  ./${source_path}/install $version $install_path "${@:3}"
 }
 
 
+get_install_path() {
+  local package=$1
+  local versio=$2
+  mkdir -p $(asdf_dir)/installs/$package
+
+  echo $(asdf_dir)/installs/$package/$(generate_random_hash)
+}
+
 
 list_all_command() {
   local source_path=$(get_source_path $1)
diff --git a/lib/asdf/utils.sh b/lib/asdf/utils.sh
index ac29a34e..2c26c515 100644
--- a/lib/asdf/utils.sh
+++ b/lib/asdf/utils.sh
@@ -8,6 +8,11 @@ asdf_dir() {
 }
 
 
+generate_random_hash() {
+  openssl rand -hex 4
+}
+
+
 run_callback_if_command() {
   if [ "$1" = "$2" ]
     then
diff --git a/sources/erlang/install b/sources/erlang/install
new file mode 100755
index 00000000..27e93d17
--- /dev/null
+++ b/sources/erlang/install
@@ -0,0 +1,55 @@
+#!/usr/bin/env sh
+
+
+
+install_erlang() {
+  local version=$1
+  local install_path=$2
+  local source_path=$(get_download_file_path $1)
+
+
+  # download_git_source $1
+  cp ~/projects/asdf/tryout/otp-17.3.4.tar.gz $TMPDIR/
+
+  # running this in a subshell
+  # because we don't want to disturb current working dir
+  echo
+  (
+    cd $(dirname $source_path)
+    tar zxf $source_path
+    cd $(untar_path $1)
+    ./otp_build autoconf
+    pwd
+    echo $install_path
+    ./configure --prefix=$install_path
+    # make
+    # make install
+  )
+}
+
+
+untar_path() {
+  local version=$1
+  echo "$TMPDIR/otp-OTP-$1"
+}
+
+
+download_git_source() {
+  curl -Lo $(get_download_file_path $1) $(get_github_download_url $1)
+}
+
+
+get_download_file_path() {
+  local version=$1
+  echo "$TMPDIR/otp-$1.tar.gz"
+}
+
+
+get_github_download_url() {
+  local version=$1
+  #TODO support downloading tags, branches and commits
+  echo "https://github.com/erlang/otp/archive/OTP-${$1}.tar.gz"
+}
+
+
+install_erlang $@