bash

unix - Unlimited Bash History - Stack Overflow
http://*.com/questions/9457233/unlimited-bash-history 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).
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