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: Note: 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. The a stands for “all”, the + for “add”, and the r for “read”. A chmod command with this form of syntax consists of at least three parts from the following lists: Access Classįor example, to add permission for everyone to read a file in the current directory named myfile, at the Unix prompt, you would enter: The first and probably easiest way is the relative (or symbolic) method, which lets you specify access classes and types with single letter abbreviations. There are two basic ways of using chmod to change file permissions: Symbolic method Access types (read, write, and execute) determine what may be done with the file by each access class. These refer, respectively, to the user who owns the file, a specific group of users, the other remaining users who are not in the group, and all three sets of users. The access classes are “user”, “group”, “other”, and “all”. Access classes are groups of users, and each may be assigned specific access types. In Unix, file permissions, which establish who may have different types of access to a file, are specified by both access classes and access types. You can change file permissions with the chmod command. In Unix, how do I change the permissions for a file?
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