Final Exam Preparation

Question 1

$ ( sleep 10; echo “red wire”) & (sleep 10;echo “blue wire”) &
[1] 17510
[2] 17511

$ ./autopilot.sh

How do you get autopilot.sh to run in the background and prevent “blue wire” from displaying on the terminal.

Answer 1

Autopilot.sh starts in the foreground.

So need to “CRTL+Z”
- suspends the process and is no asleep

Then “bg”
- sends it to the background

then kill 17511
- when using kill cmd, its “kill” and the job number

bg or bg 3
kill %2 or kill 17511

kill -9 is not required . Normal kill will allow the process to clean up after itself. But kill -9 is an immediate kill

Question 2

init is usually the grandparent of most processes

Answer 2

the parent of init PID 1 is the kernel PID 0

Question 3

when running make, an error will NOT be generated if default target is not set

Answer 3

default is to run the first RULE

Question 4

In a Makefile, actions can be unix commands

Answer 4

TRUE

Question 5

In a makfile, if a dependency is older than the target, then the actions in that rule will NOT be performed

Answer 5

only if dependency is younger than target

Question 6

Level classes : constants to specify the important level of log messages ad to control which log records to report

OFF
severe
warning
info
config
fine
finer
finest
ALL

Answer 6

properties .config to change logging functionality without recompiling code

Even if not “logged”, log messages are still constructed even though its not shown,

Logging creates more runtime cost

creating a guarded logger can lower the runtime cost

control variable can be initialized using final keyword to have statements compiled out of program

Question 7

HIERARCHY
root
attributes
elements

Answer 7

element is defined by having an open tag and closed tag

article should be unique and has a unique atttribute/entry. has unique “key”

Question 8

Project Organization

build.xml file is high level

src folder (.java etc)
bin folder (.class files) : compiled binaries

Answer 8

ANT build files are written in XML: convention is to vall file build.xml

Each build file contains:
A project
at least 1 target

Targets are composed of some number of tasks

Build files may also contain properties (i.e. marcos)

comments are with blocks

Question 9

Project Tag is used to define the projec you wish to work with

Project tags contain 3 attributes
name: logical name for the project
default: the default target to execute
basedir : base directory for which all operations are done relative to

Answer 9

A description for the project can be specified from within the project tag

Question 10

Properties

Similar to macros in a make file

name is how we refer to something in the build file

location is referring to the directory structure
can call location or value

reference is ${ }

Answer 10

can define elements in one line

including /> will open and close statement in the same line

Question 11

Targets

Target tag is similar to target in Make file

Depends: similar to dependencies and dependency chains

desscription: description of waht the target does

Answer 11

above can be run by typing

ANT init

Question 12

ANT is advanced build tool for java

Answer 12

properties : defining a maco or local variable

what are action tags