GNU Screen allows you to do something similar using its setenv command. For instance, to update the value of $DISPLAY to a new ssh session's value you could run "screen -S foo -X setenv DISPLAY $DISPLAY" before running "screen -r foo".
I have a wrapper script that reproduces tmux's behavior of automatically updating a set of environment variables. It goes a step further and also updates them in your running bash shells. For this to work you have to register a signal handler in your .bashrc that sources a file with the new environment. The script is available at https://github.com/sciurus/splatbang/blob/master/rescreen
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GNU Screen allows you to do something similar using its setenv command. For instance, to update the value of $DISPLAY to a new ssh session's value you could run "screen -S foo -X setenv DISPLAY $DISPLAY" before running "screen -r foo".
I have a wrapper script that reproduces tmux's behavior of automatically updating a set of environment variables. It goes a step further and also updates them in your running bash shells. For this to work you have to register a signal handler in your .bashrc that sources a file with the new environment. The script is available at https://github.com/sciurus/splatbang/blob/master/rescreen