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 We want the user dave to have read and write permissions and the group and other users to have read permissions only We can do using the following command chmod u=rw,og=r new_filetxt Using the "=" operator means we wipe out any existing permissions and then set the ones specified let's check the new permission on this file ls l new_filetxt chmod is a program responsible for modifying access permissions of file and directories in Unix/Linux While the concept is easy to understand, the syntax might overwhelm new users a little bit Most of the time, you will encounter chmod 777, chmod 755 and chmod 644 In this article, we will explain the meaning of these numbers and how they are related to the actual Example chmod commands (in octal and symbolic notions) setting permissions to 664 chmod 664 exampletxt chmod u=rw,g=rw,o=r exampletxt chmod arwx,ux,gx,owx exampletxt chmod 777 (rwxrwxrwx) chmod 777 is used to grant permissions to everyone to read, write, and execute a file Ho