nano ~/.tmux.conf && tmux source-file ~/.tmux.conf

tmux.conf

##### Basics #####

# Use tmux-256color and enable RGB
set -g default-terminal "tmux-256color"
set-option -sa terminal-features ",xterm*:RGB"

# History & timings
set -g history-limit 20000
set -sg escape-time 0
set -g repeat-time 300

# Don’t rename windows automatically
setw -g automatic-rename off
setw -g allow-rename off

##### Prefix & keys #####

# Change prefix to Ctrl-a (GNU screen style)
set -g prefix C-a
unbind C-b
bind C-a send-prefix

# Easier split keys (prefix | and -)
bind | split-window -h
bind - split-window -v
unbind '"'
unbind %

# Reload config quickly
bind r source-file ~/.tmux.conf \; display-message "tmux.conf reloaded"

##### Mouse & copy mode #####

# Enable mouse (resize, select pane/window, scroll)
set -g mouse on

# Use vim-style keys in copy mode
setw -g mode-keys vi

# Make copy use system clipboard when available (Linux + xclip / macOS pbcopy)
bind-key -T copy-mode-vi y send-keys -X copy-pipe-and-cancel "xclip -selection clipboard -i 2>/dev/null || pbcopy"

##### Status bar #####

# Simple status line
set -g status on
set -g status-interval 5
set -g status-justify centre

set -g status-left-length 40
set -g status-right-length 120

set -g status-left "#S "
set -g status-right "%Y-%m-%d %H:%M "

# Current window underline
set -g window-status-current-style "underscore"

##### Panes & windows #####

# Start window and pane numbers at 1
set -g base-index 1
setw -g pane-base-index 1

# Easier navigation between panes (vim-style)
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R

# Resize panes with Alt + arrows
bind -n M-Left  resize-pane -L 5
bind -n M-Right resize-pane -R 5
bind -n M-Up    resize-pane -U 5
bind -n M-Down  resize-pane -D 5

##### Quality-of-life #####

# No visual or audible bell
set -g bell-action none

# Keep dead windows visible
set -g remain-on-exit on

# Activity monitoring toggle
bind m set monitor-activity

##### TPM (plugin manager) – optional #####
# Install: git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
#set -g @plugin 'tmux-plugins/tpm'
#run '~/.tmux/plugins/tpm/tpm'