It could be very useful a command such as "Ctrl+R" in Ubuntu, where you can type some letters and find a command from the command history.

For instance, if I executed "use mydb", "mydb.mycollection.find()" and "use anotherdb", by typing "Ctrl+R" and "use m", there should be anything such as in the ubuntu's terminal that autocompletes the command "use mydb".