Import, export or merge zsh extended or fish history files.
Merge multiple history files into a single file.
$ histutils --output-format zsh-extended ~/.zsh_sessions/*.history
Migrate formats.
$ cat ~/.zsh_history | histutils --output-format fish
$ cat ~/.local/share/fish/fish_history | histutils --output-format zsh-extended
Count entries in a history file.
$ histutils --count ~/.zsh_history