12. Self-Learning Linux path: File processing class commands

commands for text-processing classes : Wc,word count
　　　　Ctrl+d Submit
Number of lines of words bytes
　　　　WC [option] [File] ...
　　　　　　- L: Count rows
　　　　　　- C: Statistics of bytes
　　　　　　- W: Count the number of words
　　　　TR: Convert or delete character, tr ' Set 1 ' Collection 2 ', must use pipe
Convert character: Converts the correspondence of the first character set to the corresponding transformation in the second character set
　　　　　　- d: Delete A character set that has occurred

　　　　　　Example:

#echo "Hello World" | Tr ' ABCDEFG ' ABCDEFG ' (piping)

#cat/etc/issue | Tr ' A-Z ' a -Z ' (piping)

12. Self-Learning Linux path: File processing class commands