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I am running several dedicated servers on different tmux sessions. I have to change ports and have to write a command in all the tmux sessions. The command is: config['Port'] = 12345, 12345 being the port. I tried to write a script which would take inputs from me and type the whole code with the code I input into all the different tmux sessions, but it doesn't work. The name of the session is 43210.

#!/bin/bash
read -p '43210: ' avar
tmux attach-session -t 43210 "config['Port'] = ${avar}"

But it never works and shows:

usage: attach-session [-dr] [-t target-session]
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Use double-quotes to expand variables in bash shell. What you done is passed avar as a literal string to tmux attach-session even though you have a value stored in the variable. Since single-quotes do not expand shell variables, you need prefix a $ before the variable name and double-quote it.

Change your script to something like, 

read -p '43210: ' avar
tmux attach-session -t 43210 "config['Port'] = ${avar}"
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