We've got two users, Tom and Mary, with user accounts tom and mary respectively. To reword that slightly, members of this group can run any command, as any user or any group, on this computer or on any other host in this network. So a simple way to give someone root privileges and the ability to use sudo, is to add them to the sudo group. All: members of this group can run all commands.(ALL:ALL): members of this group can run commands as all users and all groups.ALL=: This rule applies to all hosts on this network.If this is the case, remove the hash and save the file. On some distributions, the %sudo line has a hash # at the start of the line. The percentage sign indicates that this is a group definition and not a user definition. Everyone is governed by these permissions. You can also set the permissions on the file so that other users or groups of users can read, modify, or execute the file. If you own a file or directory (a special kind of file), you can do what you like with it, including editing, renaming, moving, and deleting it. It's easy to see then, how file permissions in Linux became one of the mainstays of user privileges and rights. The concept of "everything is a file" is far-reaching in Linux. Where possible, the design of Linux and Unix-like operating systems adhere to this principle. So although everything isn't a file, most operating system objects are handled as though they were. In truth, virtually everything in the operating system from processes, files, directories, sockets, and pipes talk to the kernel through a file descriptor. We've all heard (the oversimplification) that everything in Linux is a file. Give users full access or let them use a small subset of commands.
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