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The chmod system call cannot change their permissions This chmod calculator has two functionalities you can use it to find the command to set the permissions for your files and directories, understand what the octal modes mean eg, chmod 777, chmod 400, chmod 4664 The first functionality was explained above (in the chmod example paragraph), so let's focus on the other modeChmod command is used in two ways 1 Using octal value & position Sets the permission for owner, group and others with octal values , 4 for read , 2 for write , 1 for Is There A Web Based Converter Between Rwx And The Octal Version Unix Linux Stack Exchange Chmod octal chart