Screen

Screen is probably my favorite application. It's a perfect example of the unix philosophy.

It's simply a window manager for terminal sessions, a great tool for developers, engineers and researchers that use multiple ssh sessions to perform their work.

Install it:

# pkg-add -r screen

The way I use it is by (re)connecting to a server where screen is installed, usually in a openbsd or freebsd vm that I run on a desktop or server machine. During the time I was disconnected (travelling to/from work, etc) screen maintained my many ssh sessions for me, and when reconnect I execute the following command:

# screen -d -r

-d : any existing screen processes are detached
-r : screen then reattaches the detached screen session and attaches it to your current tty/ssh session.

Most useful commands while using screen:
Crtl - A, Shift - C : Create a new tty session
Crtl - A, Shift - A : Edit the name for display in session manager
Crtl - A, Crtl - " : invokes the session manager, use arrow keys
Ctrl -A, Ctrl -A : Toggle between two tty sessions

See the manpage for lots more on commands and customization.