A dominant (multiple choice) Linux system are:
A, multi-user multi-tasking, planning Users and Groups
B, stable, efficient and safe
C, RTOS
D, high game support ----- - correct answer: a, B
analysis:
(1), real-time operating system to emphasize a task is completed from there to execute a time predictable , commonly used in the professional field, especially military aspects, such as the missile must be in the guidance process in decision completed within a certain time, which is closer to the target.
(2), Linux, Windows systems, Apple, Andrews emphasized that the throughput, all belong to a common operating system .
Two , several of which belong to the following release of the Linux operating system?
A, the CentOS
B, the Ubuntu
C, macOS
D, redhat ---------------- correct answer: ABD
Three , linux in the command which can be converted into ordinary users superuser? ()
A, Super
B, the passwd
C, the tar
D, SU ---------------- correct answer: D
Four , Linux, how to get a file of 100-200 lines?
-n Sed '100,200p' inputfile
awk 'NR> = 100 && NR <Print} = {200 is' inputfile
head -200 inputfile | tail -100
