Looks like it is still down - but see eg: https://askubuntu.com/questions/67283/is-it-possible-to-make...

To wit:

> It says to put those commands in the .bashrc config:

    shopt -s histappend
    PROMPT_COMMAND="history -a;$PROMPT_COMMAND"

> The first command changes the history file mode to append and the second configures the history -a command to be run at each shell prompt. The -a option makes history immediately write the current/new lines to the history file.

I used to have something like this set up on my Linux laptop - the downside is that seperate shell/terminals/windows/tabs don't keep seperate history - so if you eg start a server in shell one (rails s), start editor in two - then go back to one and ctrl-c out - up arrow will now give you "vim" not "rails s".

The problem compounds if you ping, or curl in another shell etc.

Not sure what that link had as it's dead for me as well but...

PROMPT_COMMAND='history -a'

Has always worked for me. Goes in your .bashrc from the FM

PROMPT_COMMAND ¶ If this variable is set, and is an array, the value of each set element is interpreted as a command to execute before printing the primary prompt ($PS1). If this is set but not an array variable, its value is used as a command to execute instead.