1.touch directory structure/filename to create a file
2.cat shows the file content
-n show line numbers
tca file shows content backwards
3.more paging to display file content
space or f to turn pages
Carriage return page by line
Q quit
4.less
stronger than more
Multiple pages can be paged up pageUp Previous page Up arrow page up line by line
Searchable content
/keyword n key Skip to next search
5.head can see the first n lines of a file
head -n file name -- no n is added to display 10 lines by default
6.tail displays the last few lines of the file
-f Dynamically display the last 10 lines of the file
7.ln link command
ln -s [source file] [object file] create a soft link
ln [source file] [object file] create a hard link
Soft links: equivalent to shortcuts in Windows
Hard link: equivalent to copying the source file, when the link file is modified, the source file is modified synchronously