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The following is a “Hello World” example illustrating the use of the send-keys command.
Step 1. Create a detached session:
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user@host:~$ tmux new -d -s mySession
Step 2: Execute a command in the detached session:
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user@host:$ tmux send-keys -t mySession.0 "echo 'Hello World'" ENTER
Step 3: Attach to the session:
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user@host:$ tmux a -t mySession