使用例 :
[root@localhost ~]# cat test.txt
AAAAA aaaaa
BBBBB bbbbb
CCCCC ccccc
11111 22222
33333 44444
[root@localhost ~]# tr [:lower:] [:upper:] < test.txt
AAAAA AAAAA
BBBBB BBBBB
CCCCC CCCCC
11111 22222
33333 44444
[root@localhost ~]# tr [:blank:] '+' < test.txt
AAAAA+aaaaa
BBBBB+bbbbb
CCCCC+ccccc
11111+22222
33333+44444
[root@localhost ~]# tr '1' '5' < test.txt
AAAAA aaaaa
BBBBB bbbbb
CCCCC ccccc
55555 22222
33333 44444
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