Tr:translate conversion for simple operation of Linux commands

TR---translate conversion

TR Syntax Format:

TR [Options] Set1 Set2

Principle: Mapping Set1 into Set2 through the concept of set mappings

-Common parameters

-D: Specifies the set of characters that need to be deleted

-C: Using the collection's complement

Tr–c Set1 Set2 uses the complement of Set1, that is, all characters that do not contain Set1

-S: Compresses repeated characters in the input, matches consecutive repeated words to a single character

Application:

1. Encrypt and decrypt

　

2. Add digital files

Convert \ n in file to +, use $[operation] to perform arithmetic operations

3. TR set list

TR [: Class:] [: Class:]

Alnum: Letters and Numbers Alpha: letters

Digit: Digital Cntrl: Controlling (nonprinting) characters

Lower: Lowercase letter upper: Uppercase

Graph: Graphic character punct: punctuation

Space: Blank character xdigit: hexadecimal character

Tr:translate conversion for simple operation of Linux commands