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![courses.cs.washington.edu · –mkdir hw1/{old,new,test} – hw1/old, hw1/new, hw1/test – ~bob – [abc] [a-c]](https://static.documents.pub/doc/80x56/60616dbea5b58226b1373df9/amkdir-hw1oldnewtest-a-hw1old-hw1new-hw1test-a-bob-a-abc-a-c.jpg)