Answer :
You wish to grant everyone access to the /sales directory and the ability to list its contents as part of a new business policy designed to foster teamwork. Additionally, you want to permit all users to view but not edit any file included in that directory.
An instruction issued by a user to a computer to do something, such as run a single program or a group of linked programs, is known as a command. In general, commands are issued by typing them at the command line (also known as the all-text display mode) and then pressing the NTR key, which sends them to the shell. Chmod is the command and system call in Unix-like operating systems that can change the access permissions to file system objects.It might additionally have special made flags. The umask filters the request. The name is an acronym for change management.
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