Cse 15L

Front 1

A shell acts as an interface between the user and the system

Back 1

True

Front 2

As a command interpreter, the shell sends the commands to the kernel for execution

Back 2

True

Front 3

A directory is a specialized form of file that maintains a list of all files in it

Back 3

True

Front 4

Unit testing is the testing of the whole class as a unit.

Back 4

False

Front 5

JUnit is a unit testing framework for the Java Programming Language.

Back 5

True

Front 6

Debugging is not algorithmic.

Back 6

True

Front 7

In test-driven development, tests are written before the software to be tested is written

Back 7

True

Front 8

It is usually feasible to test all possible values of arguments to a method

Back 8

False

Front 9

stdout should be used for unusual output from your program, such as error reporting.

Back 9

False, stderr

Front 10

In a Makefile, every target line must begin with a tab.

Back 10

False

Front 11

In debugging, reproducing the problem comes before fixing the problem

Back 11

True

Front 12

If all your unit tests pass, that means the software being tested has no bugs

Back 12

False

Front 13

A software version management repository holds a master copy of only text/html code.

Back 13

False

Front 14

Making changes to a software repository means editing, adding and deleting files

Back 14

True

Front 15

IDE stands for “integrated development environment”

Back 15

True

Front 16

Eclipse does not allow you to have multiple workspaces.

Back 16

False

Front 17

In test-driven development, you must understand the specification of what the software you are testing is supposed to do

Back 17

True

Front 18

In Unix, executing programs have unique process identifiers.

Back 18

True

Front 19

A Unix pipe is a way to send the output of one command to the input of another.

Back 19

True

Front 20

As a login script, .profile runs each time a Unix shell is started.

Back 20

True

Front 21

The Makefile contains rules which tell make what to do.

Back 21

True

Front 22

If a target in a Makefile names a file that is older than the files it depends on, then the actions in that rule will not be performed.

Back 22

False

Front 23

Write a Unix commands that displays the contents of folder “Q1” in long form including the directory entries whose names begin with a dot (.).

Back 23

ls -al Q1

Front 24

List three common Unix shells.

Back 24

bash, zsh, csh

Front 25

Write a command to make the file “Q3.txt” in the current directory read-only

Back 25

chmod 444 Q3.txt

Front 26

Absolute path in Unix paths start at:

i. users

ii. bin

iii. home

iv. root

Back 26

iv. root

Front 27

Relative to the working directory, dot dot (..) refers to:

i. current working directory

ii. home

iii. root

iv. a level above

Back 27

iv. a level above

Front 28

List the names of the two files that a shell automatically opens when it starts up.

Back 28

.bashrc, .profile

Front 29

Write a command that redirects the contents of standard input to an output file called ‘temp.txt’.

Back 29

cat > temp.txt

Front 30

Write a filtering command using Unix pipes to search for occurrences of the word ‘time’ in the manual page for Unix command called “time”.

Back 30

man time | grep time

Front 31

What is the function of the Unix environment variable “PATH”

Back 31

A comma delineated list of paths that the shell will search through whenever you type in a command

Front 32

List two cons and two pros of unit testing

Back 32

Pros:

1) Results in modular and extensible code

2) Leads to concise goal-driven code

Cons:

1) Takes a lot of time to test each unit of code in complex code

2) Does not test the code in it's entirety

Front 33

Which file does make look for in the current working directory?

Back 33

makefile

Front 34

For this problem, consider this Makefile:A.class: A.java

javac A.java

B.class: A.class B.java

javac B.java

C.class: B.class A.class C.java

javac C.java

all: C.class B.class A.class

a. Suppose ls -l produces this output:

-rw-rw-r-- 1 u1 lec 150 May 7 13:16 A.java

-rw-rw-r-- 1 u1 lec 81 May 7 13:25 B.java

-rw-rw-r-- 1 u1 lec 189 May 7 13:20 C.java

-rw-rw-r-- 1 u1 lec 168 May 7 13:00 Makefile

(a) Now running “make all” will cause what command(s) to be executed? List them.

(b) Suppose ls -l produces this output:

-rw-rw-r-- 1 u1 lec 356 May 7 13:50 A.class

-rw-rw-r-- 1 u1 lec 150 May 7 13:16 A.java

-rw-rw-r-- 1 u1 lec 251 May 7 13:50 B.class

-rw-rw-r-- 1 u1 lec 69 May 7 13:25 B.java

-rw-rw-r-- 1 u1 lec 532 May 7 13:50 C.class

-rw-rw-r-- 1 u1 lec 189 May 7 13:55 C.java

-rw-rw-r-- 1 u1 lec 168 May 7 13:00 Makefile

Now running make all will cause what command(s) to be executed? List them.

Back 34

(a) javac A.java, javac B.java, javac C.java

(b) javac C.java

Front 35

Complete the following sentence to explain how make interprets the Makefile rules. “To make the _____________ , first make all its _____________________ , then perform all the ___________.”

Back 35

target, dependencies, actions

Front 36

List two problems that can arise in non-version controlled software when there is only one individual involved in the software development process.

Back 36

1) No way to go back to previous version once saved (revert).

2) Cannot provide stable version releases, as in cannot "freeze" one version for deployment and continue working on a new version.

Front 37

Put the following steps in order within an SVN workflow: makes changes, update, commit, resolve conflicts.

Back 37

1) make changes

2) update

3) commit

4) resolve conflicts

Front 38

Name three steps in debugging and put them in order.

Back 38

1) Identify bug

2) Reproduce bug

3) Fix bug

Front 39

Fill in the blank: A string enclosed in back quotes (``) in a Unix shell script is treated as a _____________ and the shell attempts to execute it.

Back 39

command

Front 40

Complete the following shell script.#!/bin/shecho

Total number of inputs: _______

echo First input: _____

echo Second input: ______

Back 40

1) $#

2) $1

3) $2

Front 41

Square brackets ( [ ] ) in a Unix shell script is an alias for the _____ command

Back 41

test