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Shorter
There are 2 alternatives - vote for the best!
An alternative which uses the advanced zsh globbing (pattern matching)
If you can do better, submit your command here.
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Voted you down for two reasons:
1) You used backticks. Shame. Learn the way of the Jedi.
2) Nesting commands can be powerful. Very powerful. In this case, you could exceed the number of arguments for rm. Every command has a limit, and it's OS dependent, but you could very will reach it here. The other command using xargs is faster, more reliable, and won't reach the command limit.
Hi atoponce, instead of using xargs I suggest the much more better GNU parallel ... (http://savannah.gnu.org/projects/parallel)