Infinite Bash History

infinite_history.sh

#!/usr/bin/env bash

# Eternal bash history
# --------------------

# Undocumented(?) feature which sets the size to "unlimited".
#   http://stackoverflow.com/questions/9457233/unlimited-bash-history
export HISTFILESIZE=
export HISTSIZE=
export HISTTIMEFORMAT="[%F %T] "

# Change the file location because certain bash sessions truncate .bash_history file upon close.
#   http://superuser.com/questions/575479/bash-history-truncated-to-500-lines-on-each-login
export HISTFILE=~/.infinite_history

# Force prompt to write history after every command.
# Useful when using multiple terminals spread between programs
# or machines with network shared home directory.
#   http://superuser.com/questions/20900/bash-history-loss
export PROMPT_COMMAND="history -a; $PROMPT_COMMAND"