ZSH History Improvements

These ~/.zshrc updates are helpful if you use history for autocompletion or to reference old commands.

# Where to save history
export HISTFILE=~/.zsh_history

# Make history file max size huge
export HISTFILESIZE=1000000000

# Store a ton of history in memory
export HISTSIZE=1000000000

# Save commands to history immediately
setopt INC_APPEND_HISTORY

# Add a timestamp to history entries
export HISTTIMEFORMAT="[%F %T] "
setopt EXTENDED_HISTORY

# Share zsh history between tmux sessions
setopt share_history

# Remove older entries when adding a duplicate entry
setopt hist_ignore_all_dups

You'll have to source ~/.zshrc for the changes to take effect.