How to write a shell script that starts tmux session, and then runs a ruby script

Question

I want to write a shell script that does this:

• First, create a tmux session
• Second, run a ruby script called \"run.rb\" INSIDE the tmux session
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Answer 1

If you want to keep your tmux session alive after starting some commands, a possible solution is to start a bash with an init file:

tmux new -d -s mysession "bash --init-file foo.script"

where foo.script would contain your commands. Alternatively, you can feed the command to the shell directly from the command line:

tmux new -d -s mysession2 "bash --init-file <(echo ruby run.rb)"

Note that --init-file was meant for reading system wide initialization files like /etc/bash.bashrc so you might want to 'source' these in your script.