测试数据:

[weblogic@etp-mall-dev7][/tmp]$ cat msn.txt
aaa bbb
bbb ccc
ccc ddd
bbb eee
aaa ccc
bbb sss

转换大小写:

eg.1:
[xiluhua@vm-xiluhua][~]$ cat msn.txt | tr a-z A-Z
eg.2:
AAA BBB
BBB CCC
CCC DDD
BBB EEE
AAA CCC
BBB SSS

用tr命令转换一个文件的内容,并将转换的结果输出到另一个文件

eg.:
[xiluhua@vm-xiluhua][~]$ cat msn.txt | tr [:lower:] [:upper:] > msn.bk
eg.:
[xiluhua@vm-xiluhua][~]$ tr [:lower:] [:upper:] < msn.txt > msn3.bk [xiluhua@vm-xiluhua][~]$ cat msn3.bk
AAA BBB
BBB CCC
CCC DDD
BBB EEE
AAA CCC
BBB SSS
05-11 07:44