Category OS

Hard Link vs. Soft Link

Hard links are just different names for the same file. One file can have many different names or hard links. Both original file and link file ...

Linux Hierarchy Structure

The Root Directory is the starting point of the file system hierarchy. Everything in the system, including the other directories and files of the ...

Chmod

A chmod is used to change permission of files and directories. form:     chmod  [options]  permissions  filename can be represented in two ways. ...

Alias

An alias is a (usually short) name that the shell translates into another (usually longer) name or command. Aliases allow you to define new ...

tee command

less command on the picture is used to display information to the terminal one page at a time. less is faster than other command because it ...

File permission

If you type ls -l, you can see file permission like below. First letter indicates if it is a Directory. Next each group of three characters ...

Pipe & Redirection

Pipe is used to pass output to another Program or Utility. thing1 | thing2 thing1’s output s will be passed to things2 Program or Utility. ...