You can fix it by adding this to your .bashrc
shopt -s histappendMore about it here: http://briancarper.net/blog/248/
export PROMPT_COMMAND="history -n; history -a"
I found it confusing that the history is always synced, even in the current session. This can be confusing while working, so i changed the above a bit:
HISTSIZE=10000Beside the obvious changes there are some more variables changes . "HISTCONTROL=ignoreboth:ignoredups:erasedups" to prevents bash to add dups. So your .bash_history keeps clean. Beside that i have added some more fun stuff. "cdspell" fixes typos while changing directories (yeah) and HISTSIZE increases the history size to 10000 lines.
shopt -s cmdhist
shopt -s cdspell
shopt -s histappend
#PROMPT_COMMAND="history -n; history -a"
Removing "history -n;" has the effect, that the history is still up to date when you open a new terminal but existing terminals will not get the changes immediately. You have to execute "history -n" manually if you need the changes in the current terminal.