fix bash prompt for non-interactive tty

Author: daler

.bash_prompt

@@ -2,9 +2,19 @@
 
 export PS1="\u@\h:\w\\$ "
 
-if [[ $HOSTNAME == "biowulf.nih.gov" ]] ; then
-    export PS1="\u@\[$(tput sgr0)\]\[\033[38;5;214m\]\h\[$(tput sgr0)\]:\w\\$ "
-fi
-if [[ $HOSTNAME == "helix.nih.gov" ]]; then
-    export PS1="\u@\[$(tput sgr0)\]\[\033[38;5;174m\]\h\[$(tput sgr0)\]:\w\\$ "
+# Only change prompt if running interactively
+if tty -s; then
+
+    # For colors, use colors.sh in the daler/dotfiles repo to easily show the
+    # color codes. E.g., in \033[38;5;214m\]\h, the 214 indicates an
+    # orange-yellow hostname.
+    #
+    # Or try https://bash-prompt-generator.org/ for more customization.
+    if [[ $HOSTNAME == "biowulf.nih.gov" ]] ; then
+
+        export PS1="\u@\[$(tput sgr0)\]\[\033[38;5;214m\]\h\[$(tput sgr0)\]:\w\\$ "
+    fi
+    if [[ $HOSTNAME == "helix.nih.gov" ]]; then
+        export PS1="\u@\[$(tput sgr0)\]\[\033[38;5;174m\]\h\[$(tput sgr0)\]:\w\\$ "
+    fi
 fi

docs/changelog.rst

@@ -16,6 +16,13 @@ However if you re-install (i.e. ``setup.sh --install-neovim``) you'll get nvim
 0.11.5, which behaves a little differently with LSPs but is also now supported
 here. See :ref:`nvimlspconfig_ref` for details on these keymaps.
 
+**bash**
+
+Update ``.bash_prompt`` to only change prompts in an interactive session, which
+prevents the message ``tput: No value for $TERM and no -T specified`` when
+using non-interactive prompts like rsync or cron jobs. Also include some info
+on the colors and how to customize further.
+
 2025-10-27
 ----------