PS1='\[\033[01;32m\]\u@\[\033[00;33m\]$(dirname "$(dirname "$PWD")" | xargs basename 2>/dev/null || echo "")$(if [[ "$PWD" != "/" ]]; then echo "/$(dirname "$PWD" | xargs basename 2>/dev/null || echo "")/$(basename "$PWD")"; fi)\[\033[00m\]\$ '
example:
deep@/COMMSCOPE/fastiron-10010a/ICX8200$ ll
total 0
drwxrwxrwx 1 deep deep 4096 Aug 30 13:10 ./
drwxrwxrwx 1 deep deep 4096 Aug 30 13:10 ../
drwxrwxrwx 1 deep deep 4096 Aug 31 12:20 Firmware/