Looking at http://old-releases.ubuntu.com/ubuntu/pool/main/b/bash/, it seems that up to bash_3.2-0 (which was shipped by Hardy 08.04 LTS) bash's /etc/skel/.bashrc defined
PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD/$HOME/~}\007"'
Beginning with bash_3.2-4 (Intrepid 08.10) PROMPT_COMMAND is no longer present in files shipped by bash under /etc/skel.
Looking at http:// old-releases. ubuntu. com/ubuntu/ pool/main/ b/bash/, it seems that up to bash_3.2-0 (which was shipped by Hardy 08.04 LTS) bash's /etc/skel/.bashrc defined COMMAND= 'echo -ne "\033]0; ${USER} @${HOSTNAME} : ${PWD/$ HOME/~} \007"'
PROMPT_
Beginning with bash_3.2-4 (Intrepid 08.10) PROMPT_COMMAND is no longer present in files shipped by bash under /etc/skel.