Making tmux keys similar to unix screen

tmux.conf

# Making tmux keys similar to unix screen 
# remap prefix from 'C-b' to 'C-a'
unbind C-b
set-option -g prefix C-a
bind-key C-a send-prefix

# change shortcuts for split vertical and horizontal
bind | split-window -h
bind - split-window -v
unbind '"'
unbind %

# bind list windows with '"' like in screen
bind '"' choose-tree -w
unbind "w"


# switch panes using Alt-arrow without prefix
bind -n M-Left select-pane -L
bind -n M-Right select-pane -R
bind -n M-Up select-pane -U
bind -n M-Down select-pane -D

# add mouse support
set-option -g mouse on