Move 256 colors setting into .tmux.conf.

.tmux.conf

@@ -7,6 +7,7 @@ set-option -g status-bg colour27
 set-option -g status-fg white
 set-option -g window-status-current-bg colour28
 #
+set -g default-terminal "screen-256color"
 set -g status-interval 1
 set -g status-right-length 50
 set -g status-right '#(hostname) #[bg=colour21,fg=colour27]#[fg=white] %Y-%m-%d %H:%M:%S'

.zshrc

@@ -81,11 +81,9 @@ bindkey "${key[Down]}" history-beginning-search-forward-end
 #
 if [[ "`uname -s`" == "FreeBSD" || "`uname -s`" == "Darwin" ]]; then
     alias "ls=/bin/ls -aFG"
-    alias "tmux=TERM=xterm-256color /usr/local/bin/tmux"
     alias "w=/usr/bin/w -i"
 elif [[ "`uname -s`" = "Linux" ]]; then
     alias "ls=/bin/ls -aF --color=always"
-    alias "tmux=TERM=screen-256color /usr/bin/tmux"
 else
     alias "ls=/bin/ls -aF"
 fi