Check out example codes for "zsh corrupt history file". It will help you in understanding the concepts better.

Code Example 1

#!/usr/bin/env zsh
# George Ornbo (shapeshed) http://shapeshed.com
# License - http://unlicense.org
#
# Fixes a corrupt .zsh_history file

mv ~/.zsh_history ~/.zsh_history_bad
strings ~/.zsh_history_bad > ~/.zsh_history
fc -R ~/.zsh_history
rm ~/.zsh_history_bad

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