diff --git a/install_bashrc.sh b/install_bashrc.sh
new file mode 100755
index 0000000..59e2f40
--- /dev/null
+++ b/install_bashrc.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+ask_yes_no () {
+    msg="$1"
+
+    echo -n "${msg} [Y/n]: "
+
+    read ans
+
+    case $ans in
+        "[Yy]" | "[Yy]es" | "" )
+            return 0
+            ;;
+
+        * )
+            return 1
+            ;;
+    esac
+}
+
+
+if ask_yes_no "CAUTION: This script will break current '.bashrc' if it exists. Is it OK?"; then
+    cat <<"EOF" > "${HOME}/.bashrc"
+SHELL_ENV="${HOME}/env/shell-env"
+
+source "${SHELL_ENV}/bashrc.sh"
+EOF
+
+    echo "${HOME}/.bashrc is created."
+fi
diff --git a/install_zshrc.sh b/install_zshrc.sh
new file mode 100755
index 0000000..2c4cad8
--- /dev/null
+++ b/install_zshrc.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+ask_yes_no () {
+    msg="$1"
+
+    echo -n "${msg} [Y/n]: "
+
+    read ans
+
+    case $ans in
+        "[Yy]" | "[Yy]es" | "" )
+            return 0
+            ;;
+
+        * )
+            return 1
+            ;;
+    esac
+}
+
+
+if ask_yes_no "CAUTION: This script will break current '.zshrc' if it exists. Is it OK?"; then
+    cat <<"EOF" > "${HOME}/.zshrc"
+SHELL_ENV="${HOME}/env/shell-env"
+
+source "${SHELL_ENV}/zshrc.sh"
+EOF
+
+    echo "${HOME}/.zshrc is created."
+fi