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 To assign reasonably secure permissions to files and folders/directories, it's common to give files a permission of 644, and directories a 755 permission, since chmod R assigns to both Use sudo, the find command, and a pipemill to chmod as in the following examples To change permission of only files under a specified directory9 rows  Permission Command Examples Description;The chmod command has options, of course using "=", "" or "=" changes user (u), group (g)and other (o) permissons You can explicitly specify u, g or o in the chmod command chmod u=rw myfile chmod g=rw myfile chmod ug=rw myfile This is handy, but the three commands above do not change the "other" permission They only change what is specified Learning The Shell Lesson 9 Permissions Chmod permissions chart