Quick way of installing groovy without root priviliges

And quick one-liner

mvn dependency:copy -Dartifact="org.codehaus.groovy:groovy-all:2.3.6" -DoutputDirectory=. && \
_PWD=$PWD && \
groovy() { java -jar ${_PWD}/groovy-all-2.3.6.jar "$@"; }

How to put OSX symbols like command (⌘), shift (⇧) and others in html document

Once writing the last blog entry I have faced a need of putting OSX symbols in it. After looking around I found some:

• ⇧ (⇧) shift
• ⌃ (⌃) ctrl
• ⌘ (⌘) command
• ⌥ (⌥) option
• ⇥ (⇥) tab
• ⎋ (⎋) escape
•  () apple - only on Macs

OSX 10.9.x Mavericks - how to make eclipse shortcut command + comma works properly (or more precisely - how to change shortcut for "Preferences..." menu option)

Actually there is nothing wrong with the default one ⌘, - unless you are Eclipse user extensivly using "Next/Previous Annotation" and comes from Windows/Linux world :>. In such a case you encounter weird shortcuts ⌘. for "next" and ⇧⌘. for "previous". This is at least unnatural (esspecially for my fingers :)).

Ok, usually when you'd like to change any keyboard shortcut you press ⌃F2, open System Preferences..., type "Keyboard shortcuts" - but looking back and forward through all the categories you are not able to found "Preferences..." one. The solution is to go to the last one category - "App Shortcuts". Once done under box on the right two little buttons should appear [+][-] - click on the [+]. In "Menu Title" text box type "Preferences...", and put new shortcut (eg. ⇧⌘,). Now old shortcut is freed.

Now as we have ⌘, freed, we can assign it to "Previous" command in Eclipse. To do this go the the Eclipse -> Preferences (you can use newly set shortcut ;)) -> General -> Keys -> type "Previous" and replace the shortcut.

How to implement onSelectionChange listener on CTabItem tabs of the CTabFolder widget

On the first glance there is no easy way for running arbitrary piece of code once one of the CTabItem tab is changed. Lucky there is generic addListener(int eventType, Listener listener) delivered with Widget class.

CTabItem item = new CTabItem(tabFolder, SWT.NULL);
item.setText(tabTitle);
Composite container = createContent(item.getParent());
item.setControl(container);

item.addListener(SWT.SELECTED, new Listener() {

 @Override
 public void handleEvent(Event event) {
  masterDetailsBlock.setDefaultSelection();
 }
});

But by default there is no such an event notified by CTabFolder. That is why we need take care of it.

tabFolder.addSelectionListener(new SelectionAdapter() {
 @Override
 public void widgetSelected(SelectionEvent e) {
  tabFolder.getSelection().notifyListeners(SWT.SELECTED, new Event());
 }
});

Thats all. Works like a charm ;)

Docker howto - most useful commands with examples

Docker commands

Most basic commands:

docker pull ubuntu	- downloads image from Docker repository
docker ps -a	- shows all available containers
docker ps -as	- shows all containers with the actual size of the rw-layer
docker ps -lq	- finds out container id of the last started container

How to remove all containers which name or image matches specified regular expression

  for i in $(docker ps -a | grep "REGEXP_PATTERN" | cut -f1 -d" "); do echo $i; done

Note that this command does not filter containers on any particular field - there is no difference if pattern is found on container name, image name, or any other field.

How to run bash on running container

  docker exec -ti ceb1be03097d /bin/bash

How to create image based on container

  docker commit ceb1be03097d /:

Dockerfile

How to change password to the root user?

RUN echo 'root:my_password' |chpasswd

Troubleshooting

$ docker ps
FATA[0000] Get http:///var/run/docker.sock/v1.16/containers/json: dial unix /var/run/docker.sock: permission denied. Are you trying to connect to a TLS-enabled daemon without TLS?

Try the following: $ sudo docker ps

Binding key strokes to eclipse commands

The key is specified as uppercased character. However, there can be also specified other keys, which can be also no printable.
The following special literals are available :

• SPACE, TAB, CR, DEL, ESC, BREAK, BS, CAPS_LOCK, END, HOME, INSERT, PAGE_UP, PAGE_DOWN
• ARROW_DOWN, ARROW_LEFT, ARROW_RIGHT, ARROW_UP
• F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, F13, F14, F15, FF
• NUM_LOCK, NUMPAD_0, NUMPAD_1, NUMPAD_2, NUMPAD_3, NUMPAD_4, NUMPAD_5, NUMPAD_6, NUMPAD_7, NUMPAD_8, NUMPAD_9, NUMPAD_ADD, NUMPAD_DECIMAL, NUMPAD_DIVIDE, NUMPAD_ENTER, NUMPAD_EQUAL, NUMPAD_MULTIPLY, NUMPAD_SUBTRACT
• LF, NUL, , PAUSE, PRINT_SCREEN, SCROLL_LOCK, and VT

How to lock IntelliJ IDEA on Unity launcher

Most straightforward way is running the IntelliJ from command line and once opened "right click" on icon appeared on the launcher and click "Lock to Launcher".

Now you can go to terminal (Ctrl+Atl+T) and edit newly created desktop file ~/.local/share/applications/jetbrains-idea-ce.desktop

The key point is to fix Exec entry - should be path to the ./idea.sh start script. Note that if you have not JAVA_HOME set in your environment, you need set one as shown below.

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Name=IntelliJ IDEA
Icon=jetbrains-idea-ce.png
Path=/home/krma/Downloads/idea-IC-135.690/bin
Exec=env JAVA_HOME=/usr/lib/jvm/java-8-oracle /home/krma/Downloads/idea-IC-135.690/bin/idea.sh
StartupNotify=false
StartupWMClass=jetbrains-idea-ce
OnlyShowIn=Unity;
X-UnityGenerated=true

That is basically all.