Linux File Permissions and Commands
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Linux File Permissions and Commands

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Questions and Answers

What does a umask value of 002 mean for new files created in the system?

  • Files will have read and write permissions for all users.
  • Files will have read, write, and execute permissions for all users.
  • Files will have no write permissions for the group and others. (correct)
  • Files will only be executable by the owner.
  • Which chmod command would you use to grant read, write, and execute permissions to the owner, and only read permissions to the group and others?

  • chmod 700 filename
  • chmod 644 filename
  • chmod 777 filename
  • chmod 755 filename (correct)
  • What octal value represents having no permissions at all?

  • 1
  • 5
  • 0 (correct)
  • 3
  • When the default umask is set to 000, what will be the default permissions for a newly created directory?

    <p>777</p> Signup and view all the answers

    What is the effect of the command 'chmod 644 practice' on the permissions of the file named 'practice'?

    <p>It grants read and write permissions to the owner, and read-only for group and others.</p> Signup and view all the answers

    What does the 'd' at the beginning of the mode field indicate?

    <p>It is a directory.</p> Signup and view all the answers

    What characters in the mode field represent the permissions for the user (owner) of the file?

    <p>Characters 2 through 4</p> Signup and view all the answers

    How would you add read permission for the user (owner) of a file named 'list1' using chmod?

    <p>chmod u+r list1</p> Signup and view all the answers

    In the command 'chmod g-w list1', what is the effect of this command?

    <p>It removes write permission from the group.</p> Signup and view all the answers

    Which of the following best describes what the 'chmod' command does?

    <p>It changes the access permissions for files or directories.</p> Signup and view all the answers

    What does the last three characters in the mode field represent?

    <p>The permissions for others.</p> Signup and view all the answers

    If a file's permission string is 'rw-r--r--', which of the following groups has write permission?

    <p>The user (owner).</p> Signup and view all the answers

    When using symbolic values with chmod, what does the '+' symbol signify?

    <p>Granting a permission.</p> Signup and view all the answers

    What is the effect of using the command 'chmod a-rwx practice'?

    <p>All permissions are removed for all users from the 'practice' directory.</p> Signup and view all the answers

    Which command would you use to allow write permission for the group and others in a directory named 'docs'?

    <p>chmod go+w docs</p> Signup and view all the answers

    What happens when the command 'chmod u-x sport' is executed and the user tries to enter the 'sport' directory?

    <p>The access to the 'sport' directory is denied.</p> Signup and view all the answers

    If 'r', 'w', and 'x' respectively represent read, write, and execute permissions, what does the octal representation of 'rwx' equal?

    <p>7</p> Signup and view all the answers

    What command correctly sets the permissions of a file to allow read and write access for all users while removing execute permission?

    <p>chmod ugo=rw file.txt</p> Signup and view all the answers

    When using octal values with the chmod command, which represents no permissions?

    <p>0</p> Signup and view all the answers

    What is the outcome of executing 'chmod go-w practice' on the directory?

    <p>It removes write permission from group and others.</p> Signup and view all the answers

    To set only read permission for the group on a file named 'file.txt', which command should you use?

    <p>chmod g=r file.txt</p> Signup and view all the answers

    Study Notes

    File and Directory Permissions

    • The mode field in the ls -l command output shows file permissions.
    • A "d" at the start of the mode field indicates a directory, a "-" shows a file, and an "l" signifies a link to another file.
    • The mode field has three sections: user, group, and others, each with read, write, and execute permissions represented by "r", "w", and "x".
    • Hyphens within the mode field indicate that a permission is not granted.

    The chmod Command

    • The chmod command changes file or directory permissions.
    • It can be used with symbolic or octal values.
    • Symbolic specifications include class of user (u, g, o, a), how permissions are changed (+, -, =), and permissions (r, w, x).
    • Octal specifications use a 3-digit number representing the combined permissions (read = 4, write = 2, execute = 1).

    The umask Command

    • The umask command controls the default permissions given to newly created files and directories.
    • The system administrator usually sets the initial umask value.
    • The initial umask is typically 000, resulting in default directory permissions of 777 (rwxrwxrwx).

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    Description

    This quiz covers essential aspects of file and directory permissions in Linux, including the interpretation of the 'ls -l' command and the application of 'chmod' and 'umask' commands. Test your understanding of how to manage user, group, and others' permissions effectively within a Linux environment.

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