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Administering the System (Managing users and groups (Configuring user…

- - - - Any combination of upper and lower case, punctuation and spaces. Spaces generally cause problems
      - Case sensitive
  - - - 0-99 are reserved
  - - - useradd username
        
        Contains different configurations such as groups UID and password specifications
    - - passwd password
        
        Contains configurations for password unlock,, removal, lock, update
    - - similar to useradd but for existing users
    - - allows modification of account expiration
    - - etc/passwd
    - - userdel
        
        allows to delete user files, delete while its logged i
  - - - Groupmod
        
        Modifies existing groups setting
      - gpasswd
        
        modifies password
        
        Allows for administration access
    - - groupdel
        
        Deletes a group and users
- - - - Setting logging options
        
        facility.prioriry action
        
        Facility
        
        Code word for the type of program oir tool that generated the message
        
        priority
        
        code for the importane of the message
        
        action
        
        file, remote computer or location that accepts message
        
        selector
        
        facility and priority
        
        When a program sends a message it includes a priority code
        
        the logger lgos the message to a file
        
        specifyin alerts can be done
  - - - from system tools
    - - logger message
        
        Can include the PID, output to standar error, use datagrams, tags, sockets, priority...
    - - logger shutting down for system maintenance
  - - - about system activities for a reasonable period
    - - compression
      - deletion
      - transfer
    - - weekly
        
        rotate 4
        
        create
        
        compress
        
        ...
  - - - pager program such as less
    - - regular expressions
        
        grep
    - - echoing lines to the screen as they are added
- - - - Hardware clock maintains time while pc is off
      - Software clock
        
        Set on boot time
        
        Used most of the time
  - - - allows to define the type of time used and get information of software and hardware clocks as well as setting both of them
  - - - highly accurate
      - used on sensible systems
      - A source is located
        
        ISP, distribution, public lists...
      - configuration
        
        Requires access to the internet
        
        most distros have a package called ntp
        
        NTP clients
        
        ntpdate clock.example.com
- - - - looking for events that cause it to spring into action
      - wakes up once a minute
      - examines configuration files
      - executes commands
  - - - five time configuration
        
        minute, hour, day, month, day of week
      - Create a script and add it to the /etc/cron.interval directory
  - - - crontab file
        
        can modify on which user it happens
    - - for systems which shut down often
      - Ensures regular maintanance jobs are executed
      - keeps record of programs it should execute and how often it should do it
    - - Sometimes cron an anacron are overkill
        
        at runs a program one time
        
        at one specified time