Learn about linux User-file-Permission operations

Learn linux User-file-Permission operation add gropuadd user group name modify groupmod user group name Delete groupdel user group name Add User add useradd user name set password passwd password Delete userdel User Name Change usermod user name View File cat: view tac from the beginning: View from the end more: view the file from the beginning, display less in segments: view the file content head-n file name: view the first few lines of the file, n is a digital tail-n file name: view the last few lines of the file, n is a digital search file find directory-name file name (you can also write the regular expression: 1. *) File Permission u: Owner g: Group o: Other r: read 4 w: Write 2x: Execute 1 chmod set attribute filechmod u = rwx, g = rx, o = x file indicates that the file has the permission to read, write, and execute the file on the group, for other settings that have executable permissions on chmod 751 file, you can also write them to add their values together.