Old boy Education Daily-May 4, 2017-there is a oldboy.txt file that converts all the letters inside to uppercase

Old boy Education Daily-May 4, 2017-there is a oldboy.txt file that converts all the letters inside into uppercase file contents as follows:

[email protected] oldboy]# cat Oldboy.txt oldboy.blog.51cto.comwww.oldboyedu.com

Method One: SED

[[Email protected] oldboy]# sed ' s#[a-z]#\u& #g ' oldboy.txt oldboy.blog.51cto.comwww.oldboyedu.com

Method Two: awk

(ToUpper is the built-in function of awk, the function is to convert lowercase letters to uppercase, the corresponding conversion to lowercase is to replace the ToUpper function with the ToLower function)

[[email protected] oldboy]# awk ' {print ToUpper ($)} ' Oldboy.txt oldboy.blog.51cto.comwww.oldboyedu.com

Method Three: TR

[[Email protected] oldboy]# TR ' A-Z ' A-Z ' <oldboy.txt oldboy.blog.51cto.comwww.oldboyedu.com

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Old boy Education Daily-May 4, 2017-there is a oldboy.txt file that converts all the letters inside to uppercase