LPIC-1 Exam 101 v5 (Linux Administrator) — Question 49

Which of the following commands sets the SetUID permission on the executable /bin/foo?

Answer options

• A. chmod 4755 /bin/foo
• B. chmod 1755 /bin/foo
• C. chmod u-s /bin/foo
• D. chmod 755+s /bin/foo
• E. chmod 2755 /bin/foo

Correct answer: A

Explanation

The correct answer is A, as the command 'chmod 4755 /bin/foo' sets the SetUID permission by using the leading '4'. Answer B incorrectly uses '1' which signifies a sticky bit. Answer C removes the SetUID permission, while D and E do not properly set it either.