Screen

screen.sh

#!/bin/bash

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# REATTACH or CREATE a session called "bla"
screen -xR bla

# Send "date" to the session called "bla"
screen -S bla -X stuff date

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# List running screen sessions
screen -list

# Start a screen session named "bla"
screen -S bla

# Attach to a dettached screen session named "bla"
screen -r bla

# Attach to an already attached screen session named "bla"
screen -x bla

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# More options that may be useful
-A  # Resize all windows to fit the current terminal size