diff --git a/install-global-ps1.sh b/install-global-ps1.sh
new file mode 100644
index 0000000..4ebb054
--- /dev/null
+++ b/install-global-ps1.sh
@@ -0,0 +1,179 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ "${EUID}" -ne 0 ]]; then
+  echo "Kjør som root: sudo bash $0"
+  exit 1
+fi
+
+PS1_FILE="/etc/profile.d/ps1.sh"
+BASH_BASHRC="/etc/bash.bashrc"
+
+MARKER_START="# >>> global ps1 (managed) >>>"
+MARKER_END="# <<< global ps1 (managed) <<<"
+
+echo "Skriver global PS1 til: $PS1_FILE"
+
+# Write the PS1 module (global)
+cat > "$PS1_FILE" <<'EOF'
+#!/usr/bin/env bash
+
+# This file is loaded globally. It may be sourced from /etc/bash.bashrc.
+# It must not exit the shell; only return when not interactive.
+
+case "$-" in
+  *i*) ;;
+  *) return 0 ;;
+esac
+
+# -------------------------------------------------
+# Nerd Font detection + fallback controls
+# Env overrides:
+#   PS1_FORCE_ASCII=1   -> always fallback separators
+#   PS1_FORCE_NF=1      -> always use Nerd Font separators
+# -------------------------------------------------
+_ps1_has_nf() {
+  if [[ "${PS1_FORCE_ASCII:-0}" == "1" ]]; then return 1; fi
+  if [[ "${PS1_FORCE_NF:-0}" == "1" ]]; then return 0; fi
+
+  if command -v fc-list >/dev/null 2>&1; then
+    if fc-list 2>/dev/null | grep -qi "Nerd Font"; then
+      return 0
+    fi
+  fi
+  return 1
+}
+
+# -------------------------------------------------
+# Time-based emoji (Europe/Oslo)
+# -------------------------------------------------
+_ps1_symbol() {
+  local hh mm h m
+  hh=$(TZ=Europe/Oslo date +%H); mm=$(TZ=Europe/Oslo date +%M)
+  h=$((10#$hh)); m=$((10#$mm))
+
+  if (( h >= 5 && h <= 8 )); then echo "🌅"
+  elif (( h >= 9 && h <= 10 )); then echo "☕"
+  elif (( h == 11 && m < 30 )); then echo "🥪"
+  elif (( (h == 11 && m >= 30) || (h >= 12 && h <= 15) )); then echo "💻"
+  elif (( h == 16 )); then echo "🍲"
+  elif (( h >= 17 && h <= 22 )); then echo "🌆"
+  else echo "🌙"
+  fi
+}
+
+# -------------------------------------------------
+# Path shortening (keeps /home/user visible)
+# bash 3.2+ compatible (no negative array indexes)
+# -------------------------------------------------
+_ps1_path() {
+  local p="$PWD"
+  local parts=()
+  IFS='/' read -ra parts <<< "$p"
+
+  if ((${#parts[@]} < 6)); then
+    echo "$p"
+    return
+  fi
+
+  local n=${#parts[@]}
+  local a="${parts[1]}"
+  local b="${parts[2]}"
+  local c="${parts[$((n-2))]}"
+  local d="${parts[$((n-1))]}"
+
+  echo "/${a}/${b}/…/${c}/${d}"
+}
+
+# -------------------------------------------------
+# Dynamic vars updated before each prompt
+# -------------------------------------------------
+__PS1_SYM=""
+__PS1_PATH=""
+__PS1_STATUS=0
+__PS1_USE_NF=0
+
+_ps1_update() {
+  __PS1_STATUS=$?
+  __PS1_SYM="$(_ps1_symbol)"
+  __PS1_PATH="$(_ps1_path)"
+  if _ps1_has_nf; then __PS1_USE_NF=1; else __PS1_USE_NF=0; fi
+}
+
+# -------------------------------------------------
+# Public functions
+# -------------------------------------------------
+ps1_on() {
+  PROMPT_COMMAND="_ps1_update"
+
+  local RST="\[\e[0m\]"
+
+  # Zone 1 (date/time/user): gray-blue pastel
+  local Z1_BG="\[\e[48;5;61m\]"
+  local Z1_FG="\[\e[38;5;255m\]"
+
+  # Zone 2 (host/path): turquoise / cool green
+  local Z2_BG="\[\e[48;5;37m\]"
+  local Z2_FG="\[\e[38;5;255m\]"
+  local PATH_FG="\[\e[38;5;194m\]"
+
+  # Frame
+  local FRAME="\[\e[38;5;60m\]"
+
+  # Status colors
+  local OK="\[\e[38;5;76m\]"
+  local BAD="\[\e[38;5;203m\]"
+
+  # Separators w/ fallback (NF vs non-NF)
+  local SEP_EXPR='\$( [ "$__PS1_USE_NF" -eq 1 ] && printf "" || printf "▶" )'
+  local LEFT_EXPR='\$( [ "$__PS1_USE_NF" -eq 1 ] && printf "" || printf "[" )'
+  local RIGHT_EXPR='\$( [ "$__PS1_USE_NF" -eq 1 ] && printf "" || printf "]" )'
+
+  local PROMPT_SYM="\$( [ \$__PS1_STATUS -eq 0 ] && printf '${OK}' || printf '${BAD}' )➜${RST}"
+
+  PS1="\
+${FRAME}╭─${RST}\
+${Z1_BG}${Z1_FG}${LEFT_EXPR} \d \A \u ${RST}${Z1_BG}${Z2_BG}${Z2_FG}${SEP_EXPR}${RST}\
+${Z2_BG}${Z2_FG} @\h ${PATH_FG}\${__PS1_PATH} ${RST}${Z2_BG}${Z2_FG}${RIGHT_EXPR}${RST}\
+\n${FRAME}╰── ${RST}${PROMPT_SYM} \${__PS1_SYM} "
+}
+
+ps1_off() {
+  # no-op helper; users can override if needed
+  :
+}
+
+# Enable by default (global standard)
+ps1_on
+EOF
+
+chmod 0644 "$PS1_FILE"
+
+echo "Oppdaterer $BASH_BASHRC for å source $PS1_FILE (idempotent)"
+
+# Remove old managed block if present, then add
+tmp="$(mktemp)"
+awk -v s="$MARKER_START" -v e="$MARKER_END" '
+  $0==s {inside=1; next}
+  $0==e {inside=0; next}
+  !inside {print}
+' "$BASH_BASHRC" > "$tmp"
+cat "$tmp" > "$BASH_BASHRC"
+rm -f "$tmp"
+
+cat >> "$BASH_BASHRC" <<EOF
+
+$MARKER_START
+# Load global PS1 (managed)
+if [ -r "$PS1_FILE" ]; then
+  . "$PS1_FILE"
+fi
+$MARKER_END
+EOF
+
+echo "✅ Ferdig."
+echo "Logg ut/inn (eller åpne ny shell) for å se global PS1."
+echo
+echo "Tips:"
+echo "  - Tving NerdFont glyphs:  export PS1_FORCE_NF=1"
+echo "  - Tving fallback:         export PS1_FORCE_ASCII=1"