Ctrl z (to suspend), and then use bg/fg/jobs to switch between suspended jobs
Server Stuff Blog Posts
Suspending in Bash: Quickly switch between running processes in bash
In Server Stuff
Vimattack: How to get someone's database credentials while they are editing config files on a live server
USing vim's .swp files to grab info about open files.
Linux Command Cheatsheet: Disk usage and filesize cheatsheet
Show disk usage, file sizes, how large (in bytes) each directory is, etc.