13, linux- file management commands cat, head, tail, more, less

1.cat file name or path

　　cat -n: add line numbers to output content

　　cat -b: blank lines do not add line numbers

2.tac: reverse view, you can not add parameters, can only be used alone

3.tail: 10 line after the default display

　　tail -n: n display lines after

　　Note: tail -f dynamic display log files, dynamic information tracking log

4.more: Page View, press ctrl + f View All

5.less: Page View, press q to exit Review