Terminal shows "__vte_prompt_command" error, unless "/etc/profile.d/vte.sh" is explicitly sourced

Every time I open a command terminal or press enter, this error message shows up:

bash: __vte_prompt_command: command not found

It does no harm, but it's very annoying. ~/.bash_profile is here: # .bash_profile # Get the aliases and functions if [ -f ~/.bashrc ]; then . ~/.bashrc fi # User specific environment and startup programs This is the area that causes the error in /etc/bashrc: if [ -e /etc/sysconfig/bash-prompt-xterm ]; then PROMPT_COMMAND=/etc/sysconfig/bash-prompt-xterm elif [ "${VTE_VERSION:-0}" -ge 3405 ]; then PROMPT_COMMAND="__vte_prompt_command" else PROMPT_COMMAND='printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"' fi If I add this line to ~/.bashrc, the problem is fixed: source /etc/profile.d/vte.sh Apparantly, _vte_prompt_comand is only defined in vte.sh. __vte_prompt_command() { local command=$(HISTTIMEFORMAT= history 1 | sed 's/^ *[0-9]\+ *//') command="${command//;/ }" local pwd='~' [ "$PWD" != "$HOME" ] && pwd=${PWD/#$HOME\//\~\/} printf "\033]777;notify;Command completed;%s\007\033]0;%s@%s:%s\007%s" "${command}" "${USER}" "${HOSTNAME%%.*}" "${pwd}" "$(__vte_osc7)" } What does this command do? Aren't these /etc/profile.d/*.sh files loaded at startup? Can someone explain why it is behaving this way?