I have several Ruby apps that I wanted to update to Ruby 3.3.0, and wanted to run the same commands in those folders instead of repeating the process for each app.
TMUX to the rescue! Open a pane for each app, and
cd into each apps folder. Then issue
the tmux command (
This is also useful if you want to run the same command on several servers. Open a pane for each server, ssh into it, enable synchronization and start typing.