This doesnt make sense to me...

sigint-ninja · 11-06-2014, 10:55 AM

Question 9:
Your current unmask is set to 002. If you create a new file, what will the permission of the new file be?
A. ------w-
B. rwxrwx-w-
C. -rw-rw-r—
D. rwxrwxr-x

i chose A...but the answer is b...isnt 0 no permissions???

thanks

eSelix · 11-06-2014, 11:14 AM

It works inverted. Bits set in umask will be NOT set in permission of created file (will be masked). So, for ex. 0776 means "no permissions" except "execute" for "others". But I don't think that question is properly formulated, resulting permissions also depends on flags specified during calling "open" function (which create files). And the answer should not be "c" or "d"? 002 means remove "write permission for others" and leave rest as specified on creation file flags.

273 · 11-06-2014, 12:10 PM

My understandingis that the above post is correct and the question is incorrect. I await enlightenement from those in the know

yancek · 11-06-2014, 01:39 PM

Quote:

i chose A...but the answer is b...isnt 0 no permissions???

Not with umask where the numbers are the reverse of standard permissions. Brief explanation at the link below:

http://unixhelp.ed.ac.uk/examples/umask.html

http://www.cyberciti.biz/tips/unders...lue-usage.html

273 · 11-06-2014, 01:46 PM

Quote:

Originally Posted by yancek

Not with umask where the numbers are the reverse of standard permissions. Brief explanation at the link below:

http://unixhelp.ed.ac.uk/examples/umask.html

http://www.cyberciti.biz/tips/unders...lue-usage.html

I will be bold, and probably wrong, but how abouyt the objections raised above?

rtmistler · 11-06-2014, 02:39 PM

Umask of 002 is I thought the most typical default and that would lead to permissions of 775 which would be answer (d).