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 chmod R 751 sample How to read file and directory information in Linux I used chmod to specify the permissions as a number 07 I only showed the resulting table, but I didn't explain the meaning of it The meaning of the numbers is easier to understand if you look at how files and directories are displayed in Linux Let's look at it firstUse the command cat footxt to verify that you, the file owner, can read the file again Here are some common examples of settings that can be used with chmod gw — adds write access for the group orwx — removes all permissions for others ux — allows the file owner to execute the file arw — allows everyone to read and write to the file So you can't change the permission of your folder other than the root user You need to switch to your root account and run the commands as shown below $ su root $ chmod Permissions Why Am I Not Able To Use Chmod 000 For A Folder Ask Ubuntu Unix chmod permissions table