tmux
https://www.youtube.com/watch?v=U41BTVZLKB0
https://tmuxcheatsheet.com/
![Tmux Cheat Sheet & Quick Reference _ Session, window, pane and more.pdf](../../_resources/Tmux%20Cheat%20Sheet%20&%20Quick%20Reference%20_%20Session,%20wind.pdf)



- Start a new window with `tmux` command
- At the bottom-left of screen there is `[0] 0:bash*  `
   `[0]` : session name
   `0` from `0:bash` : index
   `bash` : windows name
   `*` : current window
- to start a session with custom name use  `tmux new -s backups` or `tmux new-session -s backups`. to rename current session use `c-b $`. to close the particular session use `tmux kill-ses -t session_name`. To close current session go to command mode by `c-b :` then type `kill-session` and hit enter.
-  to create a new window use `c-b c` means press Ctrl+B then release them and instantly press c.
  to go to next window press `c-b n` and to previous window `c-b p`. to specfic window index press `c-b INDEX`(eg: `c-b 1` to go to 2nd window as 2nd window index is 1). to kill current window use `c-b &`.
 - when we start a process say `htop` that window name will be changed to `htop`. but in order to change window to custom name press `c-b ,` then type type name and enter
 - **Attach/dettach mode**: If we start a service like nodejs code by `npm start` or any other and donr want terminal to be open and just run in background we need to detach it by `c-b d`. this will detach whole session.
 To reattach to recent session use `tmux a` or  `tmux at`, `tmux attach`, `tmux attach-session`.
 To reattach to particular session use `tmux a -t backups` `-t` means target
- to list tmux sessions use `tmux ls` or `tmux list-sessions`
- **Switching**  : when in tmux, to switch between sessions use `c-b s` which will presents a tui screen to choose session from and for windows switching use `c-b w`. 
- To get list of keyboard shotcuts use `c-b ?`
- Splitting panes : To switch panes horizontally use `c-b %` and for vertically use `c-b "`. To go to last active pane press `c-b ;` and for navigating use `c-b arrow-keys` for respective direction.
 To close current pane use `c-b x`.
- to scroll press `c-b [` then use arrowkeys/pgup/pgdown keys to scroll 
- **Icons** : start tmux with `tmux -u` to enable unicode support.
   

automatic adding and running commands in tmux 
```sh
#!/bin/bash

SESSION="my_session"

tmux  new-session -d -s  $SESSION

#C-m emulates pressing enter key
tmux send-keys -t $SESSION:0 "htop" C-m

#create a new window of index 1 with name 'logs'
tmux new-window -t $SESSION:1 -n "logs"
tmux send-keys -t $SESSION:1 "history" C-m

tmux new-window -t $SESSION:2 -n "monitor"
tmux send-keys -t $SESSION:2 "while true; do echo 'Monitoring...'; sleep 5; done" C-m

tmux attach-session -t $SESSION```