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A shell script in Linux or UNIX-like operating systems is a program written using shell commands to automate tasks. In a Windows and Linux lab environment, shell scripting is commonly used in Linux systems to manage files, directories, and permissions. One practical task is to create a script that reads a directory name from the user and lists all files for which the user has read permission. This is useful in system administration, security checks, and file auditing because permissions control access to sensitive data. In Linux, every file and directory has permission settings divided into three categories: user (owner), group, and others. Each category has three _____ ___ ___ _____ _______ _________ ______ _________ ____ ______ _________ _________.
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