Unlimited Bash History

#linux #bash

edit file .bashrc
Set HISTSIZE and HISTFILESIZE to an empty string:
HISTSIZE= HISTFILESIZE=
In bash 4.3 and later you can also use HISTSIZE=-1 HISTFILESIZE=-1:

n. Setting HISTSIZE to a value less than zero causes the history list to be
unlimited (setting it 0 zero disables the history list).
o. Setting HISTFILESIZE to a value less than zero causes the history file size
to be unlimited (setting it to 0 causes the history file to be truncated
to zero size).

bash --version to check your bash version.

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
Force prompt to write history after every command.
http://superuser.com/questions/20900/bash-history-loss
Use timestamp HISTTIMEFORMAT="[%F %T] "

Finally:
HISTSIZE=-1 HISTFILESIZE=-1: HISTFILE=~/.bash_eternal_history PROMPT_COMMAND="history -a; $PROMPT_COMMAND"

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