diff --git a/files/home/.profile b/files/home/.profile
index 750bcd2..59aa768 100644
--- a/files/home/.profile
+++ b/files/home/.profile
@@ -10,47 +10,63 @@
 # xdg data & config
 export XDG_DATA_HOME=${XDG_DATA_HOME:-"$HOME/.local/share"}
 mkdir -p "$XDG_DATA_HOME"
-
 export XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-"$HOME/.config"}
 mkdir -p "$XDG_CONFIG_HOME"
 
-export PATH="$HOME/.local/bin:$PATH"
+# local user binaries
+local_bin_path="$HOME/.local/bin"
+if [[ ":$PATH:" != *":$local_bin_path:"* ]]; then
+    export PATH="$local_bin_path:$PATH"
+fi
 mkdir -p ~/.local/bin
+unset local_bin_path
 
 # workspace
-export WORKSPACE=${WORKSPACE:-"$HOME/workspace"}
+export WORKSPACE=${WORKSPACE:-"$HOME/Workspace"}
 mkdir -p "$WORKSPACE"
 
 # dotfiles
 export DOTFILES=${DOTFILES:-"$HOME/.dotfiles"}
 
-
 # nvm
 if [ -z "$NVM_DIR" ]; then
     export NVM_DIR=${NVM_DIR:-"$HOME/.nvm"}
     mkdir -p "$NVM_DIR"
-    [ -f "$NVM_DIR/nvm.sh" ] && source "$NVM_DIR/nvm.sh"
 fi
+[ -f "$NVM_DIR/nvm.sh" ] && source "$NVM_DIR/nvm.sh"
 
-# node (default v14)
-node_alias="$NVM_DIR/alias/lts/fermium"
+# node (default v20 "iron" LTS version)
+node_alias="$NVM_DIR/alias/lts/iron"
 if [ -f "$node_alias" ]; then
     VERSION=`cat $node_alias`
-    nvm install "$VERSION" > /dev/null 2>&1 & disown
-    export PATH="$NVM_DIR/versions/node/$VERSION/bin:$PATH"
+    if [ -x `command -v nvm` ]; then
+        nvm install "$VERSION" > /dev/null 2>&1 & disown
+    fi
+    node_bin_path="$NVM_DIR/versions/node/$VERSION/bin"
+    if [[ ":$PATH:" != *":$node_bin_path:"* ]]; then
+        export PATH="$node_bin_path:$PATH"
+    fi
 fi
+unset node_alias node_bin_path VERSION
 
 # pyenv
-export PYENV_ROOT="$HOME/.pyenv"
-export PATH="$PYENV_ROOT/bin:$PATH"
+export PYENV_ROOT=${PYENV_ROOT:-"$HOME/.pyenv"}
+pyenv_bin_path="$PYENV_ROOT/bin"
+if [[ ":$PATH:" != *":$pyenv_bin_path:"* ]]; then
+    export PATH="$pyenv_bin_path:$PATH"
+fi
 if [ -x `command -v pyenv` ]; then
     eval "$(pyenv init --path)"
 fi
+unset pyenv_bin_path
 
 # poetry
-export POETRY_ROOT="$HOME/.poetry"
-export PATH="$POETRY_ROOT/bin:$PATH"
-
+export POETRY_ROOT=${POETRY_ROOT:-"$HOME/.poetry"}
+poetry_bin_path="$POETRY_ROOT/bin"
+if [[ ":$PATH:" != *":$poetry_bin_path:"* ]]; then
+    export PATH="$poetry_bin_path:$PATH"
+fi
+unset poetry_bin_path
 
 # z (jump around)
 export Z_DATA_DIR=${Z_DATA:-"$XDG_DATA_HOME/z"}