Dominik's software engineering and IT architecture Blog

How to define IT Governance (first draft)

2009-03-05T07:14:00.000-08:00

Information Technology Governance, IT Governance or ICT (Information & Communications Technology) Governance, is a subset discipline of Corporate Governance focused on information technology (IT) systems and their performance and risk management

The primary goals for information technology governance are to

(1) assure that the investments in IT generate business value, and

(2) mitigate the risks that are associated with IT.

This can be done by implementing an organizational structure with well-defined roles for the responsibility of information,business processes, applications, infrastructure, etc.

Is IT governance different from IT management and IT controls? The problem with IT governance is that often it is confused with good management practices and IT control frameworks. ISO 38500 has helped clarify IT governance by describing it as the management system used by directors. In other words, IT governance is about the stewardship of IT resources on behalf of the stakeholders who expect a return from their investment. The directors responsible for this stewardship will look to the management to implement the necessary systems and IT controls. Whilst managing risk and ensuring compliance are essential components of good governance, it is more important to be focused on delivering value and measuring performance.

Related: Formal architecture compliance process: a process for ensuring new projects are adopting standard technologies

Source: Enterprise Architecture as a Stragegy

Source: answers.com

How to define enterprise architecture?

2009-03-05T02:15:00.000-08:00

Enterprise Architects use various business methods and tools to understand and document the structure of an enterprise. In doing so, they produce documents and models, together called artifacts. These artifacts describe the logical organization of:
- business strategies
- metrics
- business capabilities
- business processes
- information resources
- business systems,
- and networking infrastructure
within the enterprise.

‘Enterprise’ level architectural description:
A complete collection of these artifacts, sufficient to describe the enterprise in useful ways

An Enterprise Architecture framework is a collection of tools, process models, and guidance used by architects to assist in the production of organization-specific architectural description

A good enterprise architecture bring important business benefits, which are clearly visible in the net profit or loss of a company or organization:
A more efficient IT operation:

Lower software development, support, and maintenance costs
Increased portability of applications
Improved interoperability and easier system and network management
Improved ability to address critical enterprise-wide issues like security
Easier upgrade and exchange of system components

Better return on existing investment, reduced risk for future investment:

Reduced complexity in IT infrastructure
Maximum ROI in existing IT infrastructure
The flexibility to make, buy, or out-source IT solutions
Reduced risk overall in new investment, and the costs of IT ownership

Faster, simpler, and cheaper procurement:

Buying decisions are simpler, because the information governing procurement is readily available in a coherent plan.
The procurement process is faster - maximizing procurement speed and flexibility without sacrificing architectural coherence.
The ability to procure heterogeneous, multi-vendor open systems.

Operating Model (Business Process Integration vs. Standartization)

Operating Model Definition

Sources:
Answers.com/enterprise architecture
OpenGroup/Togaf

Links

Enterprise architecture in a Goverment Leader Perspective

How to define SOA services?

2008-08-04T15:19:00.000-07:00

In this blog entry I try to collect my experience defining SOA services. (This blog entry will be under heavy changes). Feel free to post me any comments.

If you build a service, keep always in mind that you have a lot of stakeholders in mind:

(1) service consumers
- which are interested in only the functionality they have to provide
- focued on a specific programm language (e.g. Java)
(2) architecture, which is mainly focused on
- reusability
- continuity
- versioning
- accessibility of services (repository, registry)
(3) service providers
- which are focused in reducing complexitiy
- which are focued on a specific programm language (e.g. Cobol)
(4) Business, interested in
- bussiness value
- continuity

(1)The Service consumer View
Focused on their particular problem

(2)The architecture view:
- Lego approach, composable services
- Versioning
- Lifecycle

(3)The architecture view:
- Reducing complexity. Reducing input and building constraints to reduce complexity of programming and testing

(4) Business
- The business is mainly interested into shareholder value

The goals on a timeline looks like this
(1) Service Consumers (goals are within project time)
(2) Service Producers (Services should survive different projects)
(3) Business (mid term goals)
There are a lot of conflicts:
(1) and (3): How to find a naming
(4)Architecture (long term gols)

convention which fullfill different programming approaches
(1 - 4) How to fullfill the different time scopes? --> Versioning,

Distinguish between
(a) Bulk-Services (File-Import)
(b) Messaging Services (e.g. Webservices)

(a) Bulk Services (Func. and non func. req)
- Define Character Format
- Define Output Format (Fixed-Length, Comma-Separated, ....)
- Define all attributes precise (especially years, currency, ...) e.g. DDMMYYYY, XXXX.YYYY and Currency ISO 4217
- Specify timezones for dates
- Define Periodicity (Exportdates)
- Availability
- Security Classification
- Response Time
- Size of the Export (e.g. 10 GB)
- Destination/Protocol (e.g. ftp://myFileserver)
- Logging
- When should service go in to Integration Test, Production, ...
- Versioning

(b) Messaging Services (Func. and non func. req)
- Availability
- Response Time
- Invocation Frequency
- Specify timezones for dates
- Define all attributes precise (especially years, currency, ...) e.g. DDMMYYYY, XXXX.YYYY and Currency ISO 4217
- Peak
- Loggin
- Caller Auth.
- Security Classification
- When should service go in to Integration Test, Production, ...
- Versioning

Versioning of the servicedefinition is crucual. Important is that you write every change, ore even better also the reason (and responsible) for the change in the servicedefinition or a separate document.

Scale up vs. Scale Out

2008-06-30T14:26:00.001-07:00

See http://weblogs.java.net/blog/malcolmdavis/archive/2006/07/scale_up_vs_sca.html

Reliability vs. Availability

2008-06-30T13:25:00.000-07:00

Reliability: measured by time between system failures
o Distributed system should be more reliable than single system
o 5 machines with .95 probability of being up. 1 - .05*5 probability of
being up.

􀀂 Availability: fraction of time the system is usable.
o Redundancy improves it
o Need to maintain consistency
o Need to be secure
o Need to tolerate failures: mask failures, recover from errors.

http://www.cis.upenn.edu/~lee/07cis505/Lec/lec-ch7a-consistency-v3.pdf

Calculate in Google

2008-06-06T05:05:00.000-07:00

Try the following search terms:

(120000+1500)*500 byte -> megabyte
(120 000 + 1 500) * 500 gram -> kilogram

Move Itunes-library to external drive

2008-05-04T09:54:00.000-07:00

Move Itunes library to external drive (German)

Other helpful links:
Recreate your itunes library

sed / grep /awk and other useful commands

2008-04-28T10:45:00.000-07:00

Here i'll post useful commands using sed grep & awk for OSX:

sed "s/SEARCHTERM/RESULTTERM/" result.txt

Convert Uppercase to lowercase
cat test.txt | tr [:upper:] [:lower:]

More information:SED onenliners

Delete your desired files:
find / -name "*\.eml" -exec rm -f {} \;

Guidelines for developing an application in Ruby on Rails

2008-04-17T05:09:00.000-07:00

Here I collect some guidelines how to develop in Ruby on Rails. Please feel free to comment on these guidelines. I would love to discuss them since I am quite new in Ruby on Rails

- Use an IDE (e.g. NetBeans)
- Use version control (e.g. SubVersion)
- Use the model to implement business logic
- The controller should be lean
- Don’t put business logic in to the view
- DRY: Use partials and helper-classes, …
- Use CSS for rendering your page
- Use migrations sequentially
- Consolidate migrations

Java vs. Ruby

2008-04-16T15:13:00.000-07:00

Java vs. Ruby
Compare Java, Ruby and PHP according to different criterias
The Ruby vs. Java Experiment

Rails cheat sheet

2008-04-10T06:33:00.000-07:00

As follows I show you some rails commands, which are pretty useful. Read also the following document, which summarize the most useful Rails-commands:
byOnRails-Cheatsheet-BlaineKendall.pdf

Find first Order in the table
o = Order.find(1)

Find by SQL
Use o.findbySQL

Assume an order has n protocols:

order.rb
class Order < ActiveRecord::Base
has_many :protocols

end

class Protocol < ActiveRecord::Base
belongs_to :order
end

script/console
pp = Protocol.find(1)
oo = Order.find(1)
oo.protocols << pp
oo.protocols

Iterate trough oder-array

arrayorder = Order.find(:all)

arrayorder.each do |order|
p order
end

Access the session
session[:user_id]

In the view:
< %=h Protocol.find(order.id).orderinit_date % >

Access to params:
< %= params['controller'] % >

Ruby structures

2008-04-09T08:11:00.000-07:00

If/then/else

order.order_date != nil ? order.order_date.strftime(" %d.%m.%Y %I:%M"):""

Ror: Redirecting

2008-04-04T03:25:00.000-07:00

Redirect the form to a non default route:

# POST /customer_profiles.xml
def create
....
respond_to do |format|
if @customer_profile.save
flash[:notice] = 'CustomerProfile was successfully created.'
format.html { redirect_to new_customer_path }
format.xml { render :xml => @customer_profile, :status => :created, :location => @customer_profile }
else
...
end
end
end

1:n relations in ROR

2008-04-03T08:46:00.000-07:00

1. Generate a customer_profile which belongs to a customer

./script/generate scaffold customer_profile name:string customer_id:integer

2. Make migration:

rake db:migrate

3. In the model customer_prfoile.rb

class CustomerProfile < ActiveRecord::Base
belongs_to :customer
end

4. In the console you can test the 1:n relation (script/console):

>> customer = Customer.create(:name => "Dominik")
=> #
>> cprofile = CustomerProfile.create(:name => "myprofile")
=> #
>> cprofile.customer = customer
=> #
>> p cprofile.customer.name
"Dominik"
=> nil
>> p cprofile.customer
#
=> nil
>>

Ruby routes howto

2008-04-03T06:47:00.000-07:00

http://localhost:3000/customers/32/client_profiles/new

in routes.rb:

map.resources :customers do |c|
c.resources :client_profiles
end

in client_profiles_controler.rb:

in method new:

# GET /client_profiles/new # GET /client_profiles/new.xml def new @client_profile = ClientProfile.new @client_profile.customer_id = params[:customer_id] respond_to do |format| .... end end

in method create:

# POST /client_profiles
# POST /client_profiles.xml
def create
@client_profile = ClientProfile.new(params[:client_profile])
@client_profile.customer_id = params[:customer_id]
respond_to do |format|
if @client_profile.save
.....
end

Scaffolding types

2008-04-02T05:14:00.000-07:00

-binary
-boolean
-date
-datetime
-decimal
-float
-integer
-primary_key
-string
-text
-time
-timestamp

See also: http://www.packtpub.com/article/Working-with-Rails-ActiveRecord-Migrations-Models-Scaffolding-and-Database-Completion

Usefull ruby commands

2008-04-01T06:53:00.000-07:00

Create project with mysql:
rails bla --database=mysql

Create database:
In the Projectdirectory: "rake db:create:all"

Update tables:
In the Projectdirectory: "rake db:migrate"

Start Server:
In the Projectdirectory: "script/server"

Start documentation:
gem server -p 3333

Start console:
In the Projectdirectory: "script/console"

Scaffolding:
./script/generate scaffold person_profile name:string company:string organisation:string unit:string function:string role:string

After using command "rake db:migrate" you'll find the generated code here:
http://localhost:3000/profiles

Show all routes:
rake routes

Partials:
Comming soon

Migrations in Ruby:
1. Create migration: script/generate migration alter_client_profile
2. Alter migration, see example below:
class AlterClientProfile <>

3. rake db:migrate

New consistent database from migrations:
- rake db:drop
- rake db:create
- rake db:migrate

MySQL using terminal with OSX

2008-04-01T06:41:00.001-07:00

Precondition:
Install MySQL-Binary from http://dev.mysql.com/downloads/mysql/5.0.html#macosx-dmg

Start Server:
/usr/local/mysql/bin/mysqld_safe

Start DB-Client:
/usr/local/mysql/bin/mysql -u root
- Use Database: use langodem_development
- show tables;
- Delete Database: drop database langodem_development

Create DB langodem:
/usr/local/mysql/bin/mysqladmin -u root create langodem

Connect to DB langodem:
./mysql -u root langodem

Find all running mysql-server instances
ps -ef | grep mysqld

Kill all mysql-server instances
killall -TERM mysqld

Set Path in OSX / Linux

2008-04-01T03:50:00.000-07:00

In bash_login

export PATH=/usr/local/mysql-max-5.0.27-osx10.4-powerpc/

Work with SVN from terminal

2008-03-28T06:13:00.000-07:00

Work with a svn project:
svn chk https://my_svn_server

svn update: "Update from SVN-Server"
svn add

Install Ruby on Rail in 5 steps (Mac)

2008-03-28T00:30:00.000-07:00

1. Install Xcode
2. Install MacPorts
3. Install MySql-DB using command line tool ports: ports install mysql5 +server
4. Update Rails using command line tool gem: "sudo gem update"
5. sudo gem install daemons gem_plugin mongrel mongrel_cluster --include-dependencies
6. sudo gem install mysql

Definitions

2008-01-18T03:29:00.001-08:00

TCO (Total cost of ownership) Gesamtheit der Kosten einer Investition, die über ihren kompletten Lebenszyklus hinweg anfallen

Routing unter OSX

2008-01-17T05:14:00.001-08:00

Routingtabelle anzeigen

netstat -rn -f inet

Bsp:
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 172.16.0.1 UGSc 19 6 en1
10/24 10.0.0.2 UGSc 0 0 en1

Route hinzufügen:
wotruba@mac:~$ sudo route add -net 10.0.0.0 10.0.0.2 255.255.255.0
add net 10.0.0.0: gateway 10.0.0.2

Routen löschen

route delete -net 10.0.0.0 10.0.0.2 255.255.255.0

More patterns

2007-12-05T04:27:00.001-08:00

http://www.java-interview.com/design_patterns_interview_questions.html

Factory method

2007-12-05T04:24:00.000-08:00

public abstract class EiskugelAutomat{
Eiskugel eiskugel; //programmieren gegen Abstraktion (hier abstrakte Klasse)

// factory-Methode muss von konkreten Eiskugelautomaten impl. werden
protected abstract Eiskugel createEiskugel(String typ);

public Eiskugel getEiskugel(String typ){
eiskugel = createEiskugel(typ); // uns interessiert nicht, welche Art von Eiskugel wir bekommen
return ek;
}
}
public class StandardEiskugelAutomat extends EiskugelAutomat{
protected Eiskugel createEiskugel(String typ){
if(typ.equals("erdbeer")){
eiskugel = new ErdbeerEiskugel();
}
else if(typ.equals("schoko")){
eiskugel = new SchokoEiskugel();
} ...
return eiskugel;
}
}
public class DiätEiskugelAutomat extends EiskugelAutomat{
protected Eiskugel createEiskugel(String typ){
if(typ.equals("erdbeer")){
eiskugel = new DiätErdbeerEiskugel();
}
else if(typ.equals("schoko")){
eiskugel = new DiätSchokoEiskugel();
} ...
return eiskugel;
}
}

Abstract Factory Pattern

2007-12-05T04:20:00.000-08:00

public abstract class Eiskugel{
//allgemeine Eigenschaften und Methoden
...
}
public class ErdbeerEiskugel extends Eiskugel{
public String toString(){
return "Erdbeereiskugel";
}
}
public class SchokoEiskugel extends Eiskugel{
public String toString(){
return "Schokoeiskugel";
}
}

public class EiskugelFactory{
Eiskugel eiskugel;
public Eiskugel createEiskugel(String typ){
if(typ.equals("erdbeer")){
eiskugel = new ErdbeerEiskugel(); //konkrete Implementierung!
}
else if(typ.equals("schoko")){
eiskugel = new SchokoEiskugel(); //konkrete Implementierung!
} ...
return eiskugel;
}
}

Delegate Pattern

2007-12-05T04:09:00.000-08:00

Example

class A {
void f() { System.out.println("A: doing f()"); }
void g() { System.out.println("A: doing g()"); }
}

class C {
// delegation
A a = new A();

void f() { a.f(); }
void g() { a.g(); }

// normal attributes
X x = new X();
void y() { /* do stuff */ }
}

public class Main {
public static void main(String[] args) {
C c = new C();
c.f();
c.g();
}
}

Visitor Pattern

2007-12-05T03:56:00.000-08:00

Advantage of the visitor pattern
- Easy to add new opeartions to the datastructure by adding new visitors: (see http://de.wikipedia.org/wiki/Besucher_(Entwurfsmuster))

Disadvantages of the visitor pattern
- New classes of datastructure elements (e.g. Body) requires to change all visitors, see also classes marked with * in example

Example:

interface Visitor {
void visit(Wheel wheel);
void visit(Engine engine);
* void visit(Body body);
void visit(Car car);
}

class PrintVisitor implements Visitor {

public void visit(Wheel wheel) {
System.out.println("Visiting "+ wheel.getName()
+ " wheel");
}
public void visit(Engine engine) {
System.out.println("Visiting engine");
}
* public void visit(Body body) {
System.out.println("Visiting body");
}
public void visit(Car car) {
System.out.println("Visiting car");
}

}

class DoVisitor implements Visitor {
public void visit(Wheel wheel) {
System.out.println("Steering my wheel");
}
public void visit(Engine engine) {
System.out.println("Starting my engine");
}
* public void visit(Body body) {
System.out.println("Moving my body");
}
public void visit(Car car) {
System.out.println("Vroom!");
}
}
interface Visitable {
void accept(Visitor visitor);
}

class Body implements Visitable{
public void accept(Visitor visitor) {
visitor.visit(this);
}
}

class Car implements Visitable {

public void accept(Visitor visitor) {
visitor.visit(this);
engine.accept(visitor);
body.accept(visitor);
for(Wheel wheel : wheels) {
wheel.accept(visitor);
}
}

Hole example you find here:
http://en.wikipedia.org/wiki/Visitor_pattern

Increase Heap space in Tomcat

2007-11-01T11:35:00.000-07:00

set JAVA_OPTS=-Xmx1024m -Xms512m

change user in subversion

2007-09-26T05:28:00.000-07:00

Delete files in the following directories and resync
../Subversion/auth/svn.simple
../Subversion/auth/svn.ssl.server
../Subversion/auth/svn.username

Add Java Exception breakpoint in Eclipse

2007-06-19T23:42:00.001-07:00

1. Switch to debug perspective

2. Run

3. Java Exception breakpoint

Java and Final

2007-06-14T14:55:00.000-07:00

final is one of the most under-used features of Java. Whenever you compute a value and you know it will never be changed subsequently put a final on it. Why?

• final lets other programmers (or you reviewing your code years later) know they don't have to worry about the value being changed anywhere else.

• final won't let you or someone else inadvertently change the value somewhere else in the code, often by setting it to null. final helps prevent or flush out bugs. You can always remove it later.

• final helps the compiler generate faster code.

see http://mindprod.com/jgloss/final.html

Arbeitsstation per Mausklick sperren

2007-06-07T13:58:00.001-07:00

Um Ihre Arbeitsstation mit einem Mausklick zu sperren, erstellen Sie eine neue Verknüpfung, und geben Sie im Textfeld "Speicherort des Elements" folgenden Befehl ein:

rundll32.exe user32.dll,LockWorkStation

Check wether a String is a number

2007-06-06T06:12:00.001-07:00

private boolean isNumber(String s) {
for (int j = 0;j < s.length();j++) {
  if (!Character.isDigit(s.charAt(j))) {
   return false;
  }
}
return true;
}

Singleton pattern in Java

2007-06-06T06:09:00.001-07:00

What is the Singleton Pattern, and when is it used?
The singleton design pattern is used when only one instance of an object is needed throughout the lifetime of an application. The singleton class is instantiated at the time of first access and the same instance is used thereafter till the application quits. To ensure that the user can create only one instance of this class, the following things have to be taken care of.

1. Make sure the user cannot explicitly create an instance of this object.
2. Provide access to this object from all areas of the application so that the need to create another instance never arises.

Uses:
The Singleton class can be used in various places where one would need a common repository of information that can be accessed from all objects in an application. A common example could be Preferences for the user. The preferences can be loaded from a file into memory into a singleton class which all objects in the application can then access to get preferences information.

See also: http://www.javareference.com/jrexamples/viewexample.jsp?id=25

Example:

public class Singleton{

private Singleton(){}

private static Singleton instance;

public static Singleton getInstance(){
if (instance == null)
instance = new Singleton();
return instance;
}

SPEED UP YOUR 9500 / 9300 /9300i COMMUNICATOR

2007-05-25T16:52:00.001-07:00

1. Clear your Logs --> Desk-->Menu-->Tools-->Logs
Press Menu --> Tools --> Log Duration (SET THIS TO 1 /3 or 5 DAYS)

The default number is 30 days. Example your receive at least 20 calls
p/day + 20 outgoing calls p/day + 20 sms's (All this data gets
captured into this log) the following symptons appear with the phone:

Slow response of the telephone cover buttons ; out of memory errors;
if u press the green answer button; the bloody thing Answers a call
after 3/5 seconds later.

2. Change the Search Criteria for your contacts
goto contacts-->menu-->tools-->settings--> "SEARCH TAB"; turn COMPANY
& EMAIL -OFF.

Ideally nokia needs to release better firmware software for the
phone; at the moment this was tested with V5.22(01) , to my
knowledge, there is later beta software, SO PLEASE CHECK YOUR PHONE
BY PRESSING *#0000# then book your phone in if older; BACKUP YOU
PHONE BEFORE THE BOOKING because the upgrade will WIPE OFF EVERYTHING
IN THE PHONE MEMORY.

Zip / Unzip in the shell

2007-05-25T05:24:00.000-07:00

zip -r test.zip *

unzip test.zip

Towel Day

2007-05-25T02:10:00.000-07:00

From Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Towel_Day)

Jump to: navigation, search

Towel Day is celebrated every May 25 as a tribute by fans of the late author Douglas Adams. The commemoration was first held in 2001, two weeks after his death on May 11, and since then has been extended to an annual event. On this day, fans carry a towel with them throughout the day. The towel is a reference to Adams's popular science fiction comedy series The Hitchhiker's Guide to the Galaxy.

Import myDatabase.dmp file into Oracle

2007-05-23T01:40:00.001-07:00

imp username/password@servername

Linux: Count number of occuring tags in a xml file

2007-05-16T04:34:00.000-07:00

grep "<mytag>" myfile.xml | wc -l

Nice examples of shell commands for OSX

2007-05-15T04:25:00.001-07:00

http://www.westwind.com/reference/OS-X/commandline/admin.html

Useful shell commands for OSX: pbcopy and pbpaste

2007-05-15T04:17:00.000-07:00

Try “history | pbcopy” in the shell and “APPLE-V” in your favourite editor.

There is the also the opposite command: pbpaste

Useful resources for working with VIM on MAC-OSX

2007-05-15T03:59:00.001-07:00

http://wiki.macvim.org/wiki/

Linux: Find command ssh in your history

2007-05-15T01:38:00.001-07:00

history | grep -i ssh

Upserts in Oracle

2007-05-03T04:29:00.000-07:00

MERGE <hint> INTO <table_name>
USING <table_view_or_query>
ON (<condition>)
WHEN MATCHED THEN <update_clause>
WHEN NOT MATCHED THEN <insert_clause>;

Source: http://www.psoug.org/reference/merge.html

UML FAQ: Association vs. Aggregation vs. Composition

2007-05-02T02:48:00.001-07:00

Example:
Account -> Transaction, should be association, because they can live independently
(XMI: aggregation="none")

Order -> Order Line, should be aggregation, because the part cannot live without the whole.

(XMI: aggregation="shared")

Navigability is important when coding:
In the Account case, it means it will had an attribute of type Transaction.

Last point about aggregation, is in case when it is a composition, the whole will be responsible for the construction/destruction for the part also. It means there would be works for the whole to do.

(XMI: aggregation="composite")

Source: http://www-128.ibm.com/developerworks/forums/dw_thread.jsp?forum=346&message=13776783&thread=101811&cat=24

BEA Weblogic: What to to do if the deployment is becoming slower and slower?

2007-04-17T01:56:00.000-07:00

- Important: Make a copy of directory /myserver
- Delete directory myserver
- Reconfigure Users and Groups

How to call ant from a batch file

2007-04-11T04:43:00.000-07:00

example:

call ant clean
call ant products
call ant whatever
cd "C:\Programme\Internet Explorer"
c:
iexplore http://www.google.com

EJB-QL using BEA Weblogic

2007-04-10T09:07:00.000-07:00

Define Queries in "ejb-jar.xml"
Define Mapping in "weblogic-cmp-rdbms-jar.xml

How to select the first table row in Oracle?

2007-04-10T07:28:00.001-07:00

select * from table where rownum = 1

Grep & Find

2007-04-10T01:21:00.000-07:00

Find all files which contains " test ":
grep -lri "[[:space:]]test[[:space:]]" *

Find all files with the name test
find . -name "test"

ps

2007-03-20T12:53:00.001-07:00

User processes: ps -ux
All processes: ps -aux
kill -9 processNr

Tar

2007-03-20T11:00:00.000-07:00

tar -cvf directory/my.tar directory1 directory2 directory3

ssh & scp

2007-03-20T10:57:00.000-07:00

ssh -l username servername
scp * username@servername:/directory

How to find out the oracle version?

2007-03-01T04:39:00.001-08:00

Show class files store in jar file

2007-02-23T05:21:00.000-08:00

jar -tvf tools.jar

Use single quotes inside a where clause in Oracle

2007-01-23T06:38:00.000-08:00

select *
from XXXX x
where x.name= ' john''s

Send mails from a Linux/Unix Shell

2007-01-16T01:34:00.000-08:00

mail -s "my header" mymail@mydomain.com < myfile

Command nohup in Linux

2007-01-08T04:22:00.000-08:00

nohup

Funktion:
nohup läßt ein Programm die Signale SIGHUP SIGINT SIGQUIT und SIGTERM ignorieren

Syntax:
nohup Kommando [Argument ...]
Beschreibung:
nohup schützt ein Programm vor den HANGUP-Signalen. Dadurch kann es im Hintergrund weiterlaufen, auch wenn der Benutzer sich ausloggt. Normalerweise würden mit der Loginshell alle Prozesse des Anwenders durch ein SIGHUP beendet.