Question

The most important improvement in 4BSD, a UNIX version developed by UC Berkley, is

Select one:

a. Signal handling in this version is more reliable.

b. A new file system that makes it faster.

c. Introduction of networking.

d. Introduction of virtual memory and paging.

In order to find certain pattern in different files, which of the command(s) shall be used in Linux?

Select one:

a. cat

b. od

c. cut

d. grep

Compared with a GUI, the so called Shell in Linux does not have following advantage:

Select one:

a. Easier to learn

b. Easier to extend

c. More powerful

d. Faster to use

Compared with Java SecurityManager Architecture, Dalvik environment would be responsible for?

Select one:

a. No use of native code in application implementations

b. Critical aspects of system robustness

c. Simplifies Dalvik enrionment

d. Critical aspects of system stability

Answer 1

2. grep (d)

grep is command is used find patterns in a file and also use for file operations for file.

cat is command used to create file , add content to file and display content in file.

cut is command used to cut the lines from the file depend on condition like cut first five lines in lines.

od is command is used to display file in different formats like binary.

3. GUI (a)

GUI main use of GUI is easy to understand and use.

GUI is representation of command in image or button format so that we user does not required to remember the commands and very to easy to learn and use the application. For example WIndows.

4. No use of native code in application implementations (a)

Dalvik enviroment creates Dex file and again Dex file is converted to odex file ( which is Optimized Dex file) by dexOpt process. This odex file runs on android’s Dalvik environment or Virtual machime to run our application and more frequently part of our application (Hot code) is converted to native code dynamically (on the fly) at run time so that , application can perform better.

1. Introduction of networking.(d)

The most important improvement in 4BSD, a UNIX version developed by UC Berkley, is  Introduction of networking and protocols.