Linux下大括号的使用扩展

[root@sre01 shells]# echo {2,4,6}
2 4 6

[root@sre01 shells]# echo {1..20}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

[root@sre01 shells]# echo {a..z}
a b c d e f g h i j k l m n o p q r s t u v w x y z

[root@sre01 shells]# echo {00..30..2}
00 02 04 06 08 10 12 14 16 18 20 22 24 26 28 30

[root@sre01 shells]# echo {a..z..2}
a c e g i k m o q s u w y

[root@sre01 ~]# echo {a..d} {A..D}
a b c d A B C D

[root@sre01 ~]# echo {a..d}{A..D}
aA aB aC aD bA bB bC bD cA cB cC cD dA dB dC dD