A system administrator sets the default umask for a user to 0027. If the user creates a new file and a new directory, what will be their octal permissions?
Directory: 755, File: 644
Directory: 750, File: 640
Directory: 750, File: 750
Directory: 777, File: 666
The correct answer is that the directory will have 750 permissions and the file will have 640 permissions.
The umask utility works by removing permissions from the system's default values when a new file or directory is created. In Linux, the default permission for a new directory is 777 (rwxrwxrwx), and the default for a new file is 666 (rw-rw-rw-).
To find the resulting permissions, the umask value is subtracted from the default value for each type:
Directory Calculation: 777 (default) - 027 (umask) = 750
7 (rwx) - 0 = 7 (rwx)7 (rwx) - 2 (w) = 5 (r-x)7 (rwx) - 7 (rwx) = 0 (---)rwxr-x--- or 750File Calculation: 666 (default) - 027 (umask) = 640
6 (rw-) - 0 = 6 (rw-)6 (rw-) - 2 (w) = 4 (r--)6 (rw-) - 7 (rwx) = 0 (---) (Since write and execute are already 0 for 'other', only read is removed, but the subtraction still results in 0)rw-r----- or 640The other options are incorrect because they result from common mistakes, such as using the wrong default values or applying the mask incorrectly.
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
All IT & Cybersecurity Package plans include the following perks and exams .
Our pricing is simple. Full access to all certifications and exams in each package, for one price.
As many practice tests for as many topics as you want.
Use study mode non-stop, no limits.
Access to our AI assistant, Bash, trained to help you pass your exam.
Track your scores over time in study mode and report cards.
See how you improve over time, and where you need to focus.
Access our store with even bigger discounts than before.
Unlimited access to all performance questions and be prepared for the real thing.
All IT & Cybersecurity Package plans include unlimited access to the following study materials.
Create an account or sign in to access our study materials.