Think before you speak, read before you think.
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by
seq 5 会打印 1-5 的数字,一个数字一行
1 2 3 4 5
seq 22 27 打印 22-27 数字
22 23 24 25 26 27
seq -w 00 05 打印 00-05
00 01 02 03 04 05
同理 seq -w 000 005 打印 000-005
000 001 002 003 004 005
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