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tmux

tmux keybinding​

Change tmux keybinding prefix from Ctrl-B to Ctrl-A.

Open the tmux config file:

$ vim ~/.tmux.conf

and add the following

# command prefix
unbind C-b
set-option -g prefix C-a

Basic commands​

# create new session
tmux

# create named session
tmux new -s <name>

# create detached session
tmux new -s <name> -d

# detach from session
<ctrl+a d>

# list sessions
tmux ls

# attach to session
tmux attach
# or
tmux a

# attach to named session
tmux a -t <name>

# kill named session
tmux kill-session -t <name>

# kill active session
<ctrl+a x y>

# kill tmux server (and all its sessions)
tmux kill-server

Advanced​

.bashrc to open in tmux session by default​

It might be useful to "auto start" tmux session, e.g. on remote server that you are SSHing into.

Add the following to your .bashrc on the remote machine:

if [ -z "$TMUX" ]; then
    tmux attach -t default || tmux new -s default
fi
"Explanation"
  • -z string is True if the string is null. Since $TMUX is null iff we are not in a tmux session, this is equivalent to if not in tmux session
  • tmux attach -t default will attempt to attach to a session named default
  • if there is no such session it will fail, and || means we pass to the second command
  • tmux new -s default will create a new tmux session named default