Bash Time Saver

The other day I was helping a friend get their Django site back online, and I found myself doing a couple of very similar commands when backing up the databases:

$ pg_dump -U some_database -f some_database_backup.sql

I use Bash as my shell in Linux, and apparently it's capable of doing some neat string substitution. I wanted to try something I had seen a few days prior to save myself a few keystrokes. Here's what I was trying to do:

$ pg_dump -U some_database -f some_database_backup.sql
$ ^some_database^some_other_database

Which, I had hoped would replace all instances of some_database with some_other_database from the previously executed command. It turns out that the ^search-for^replace-with is only good for one substitution. That means that my sneaky attempt at saving keystrokes just overwrote the first database's backup with the backup of the second database. In other words, I was getting this:

$ pg_dump -U some_database -f some_database_backup.sql
$ pg_dump -U some_other_database -f some_database_backup.sql

...when I wanted this...

$ pg_dump -U some_database -f some_database_backup.sql
$ pg_dump -U some_other_database -f some_other_database_backup.sql

I did a little more digging today, and it turns out that I should have been using the following syntax:

$ pg_dump -U some_database -f some_database_backup.sql
$ !!:gs/some_database/some_other_database/

The !! is shorthand for executing the previous command, and the :gs is used for global string replacement. And there you have it!

Out of curiosity, does anyone know of similar functionality in other shells?