Eternal History File

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cat << EOF | sudo tee /etc/profile.d/eternal-history.sh
# set unlimited history
export HISTFILESIZE=
export HISTSIZE=

# add timestamp to history
export HISTTIMEFORMAT="%F %T » "

# use different file as sometimes .bash_history gets truncated
# http://superuser.com/questions/575479/bash-history-truncated-to-500-lines-on-each-login
export HISTFILE=~/.eternal_history

# Preserve bash history in multiple bash shells?

# remove duplicates
export HISTCONTROL=ignoredups:erasedups

# appending a on exiting session vs rewriting is turned on by default 
# shopt -s histappend

# force prompt to write history after every command.
# simplest version: after each command, append to the history file and reread it
# "-a" history to file, "-c" clears history, "-r" reads history from file
PROMPT_COMMAND="history -a; history -c; history -r"
EOF