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Bash - Update terminal title by running a second command
trap 'echo -ne "33]0;$BASH_COMMAND07"' DEBUG

function settitle () {
    export PREV_COMMAND=${PREV_COMMAND}${@}
    echo -ne "33]0;${PREV_COMMAND}07"
    export PREV_COMMAND=${PREV_COMMAND}' | '
}

export PROMPT_COMMAND=${PROMPT_COMMAND}';export PREV_COMMAND=""'

trap 'settitle "$BASH_COMMAND"' DEBUG

trap 'echo -ne "33]2;$(history 1 | sed "s/^[ ]*[0-9]*[ ]*//g")07"' DEBUG

true && (false); echo $? | cat

true | echo $? | cat