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The most useful smallest tmux trick by yours truly.

It will open your $EDITOR in the lower 3rd of your tmux window until you exit it.

Place this in your .bashrc:

peek() { tmux split-window -p 33 "$EDITOR" "$@" }`

Place this in your .profile (ksh)

function peek {
    tmux split-window -p 33 "$EDITOR" "$@"

Restart your terminal.

Run peek a_file_you_really_want_to_look_at.txt

PS! Make sure you have set export EDITOR=<your editor of choice>, otherwise the split window will just open then close.

Source: https://github.com/lf94/peek-for-tmux