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struct task_struct {
        volatile long state;
                void *stack;
                unsigned int flags;
        int prio, static_prio;
        struct list_head tasks;
        struct mm_struct *mm, *active_mm;
        pid_t pid;
                pid_t tgid;
        struct task_struct *real_parent;
        char comm[TASK_COMM_LEN];
        struct thread_struct thread;
        struct files_struct *files;
        ...
};
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Howto: Linux Add User To Group (tips)

Q. How can I add a user to a group under Linux operating system?
A. You can use useradd or usermod commands to add a user to a group. useradd command creates a new user or update default new user information. usermod command modifies a user account i.e. it is useful to add user to existin ......

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