![]() In each of these examples, the access types that aren't specified are unchanged. For example, to remove write permission and add execute for all users on myfile, you would enter: chmod a-w+x myfile You can also specify that different permissions be added and removed in the same command. For example, to remove read and write permission for group and other users (leaving only yourself with read and write permission) on a file named myfile, you would enter: chmod go-rw myfile You can also specify multiple classes and types with a single command. If you omit the access class, it's assumed to be all, so you could also enter the previous example as: chmod +r myfile ![]() This assumes that everyone already has access to the directory where myfile is located and its parent directories that is, you must set the directory permissions separately. A chmod command using this method consists of at least three parts from the following lists: The first and probably easiest way is the relative (or symbolic) method, which lets you specify permissions with single letter abbreviations. There are two basic ways of using chmod to change file permissions: The symbolic method and the absolute form. The owner of a file can change the permissions for user ( u), group ( g), or others ( o) by adding ( +) or subtracting ( -) the read, write, and execute permissions. To change file and directory permissions, use the command chmod (change mode). In both examples above, these are set to the same permissions as the group.
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