close
[sean@station62 tmp]$ mkdir {0..9}
[sean@station62 tmp]$ ls
0 1 2 3 4 5 6 7 8 9
[sean@station62 tmp]$ mkdir {a..c}{1..3}
[sean@station62 tmp]$ ls
0 1 2 3 4 5 6 7 8 9 a1 a2 a3 b1 b2 b3 c1 c2 c3
[sean@station62 tmp]$ mkdir {a,b}{1..3}.txt
[sean@station62 tmp]$ ls
a1.txt a2.txt a3.txt b1.txt b2.txt b3.txt
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