tmux new -s whatever

.tmux.conf

set -g prefix C-b

# window numbering starts at 1
set -g base-index 1
setw -g pane-base-index 1

# use emacs
set -gw mode-keys emacs
set -g status-keys emacs

# split windows
bind | split-window -h
bind - split-window -v

set -g default-terminal "xterm-256color"

# no time between C-b and commands
set -s escape-time 0

bind-key b set-option status

# resize panes w/ repeat every 1ms
bind -r + resize-pane -D 1
bind -r _ resize-pane -U 1
bind -r L resize-pane -L 1
bind -r R resize-pane -R 1

# Reload tmux config
bind r source-file ~/.tmux.conf

# turn off mouse
# setw -g mode-mouse off

set-window-option -g status-left " #S "
set-window-option -g status-left-fg black
set-window-option -g status-left-bg white

set -g status-right ''
set-window-option -g status-right-fg black
set-window-option -g status-right-bg white

set-window-option -g window-status-format " #I "

set-window-option -g window-status-current-format " #I "
set-window-option -g window-status-current-fg green
set-window-option -g window-status-current-bg black