Laszlo Miklosik laszlomiklosik

## curl send multi-line JSON payload example
curl -X PATCH http://localhost:8080/Users/7234e4cd-eb7f-4a96-953e-3bd11439efcf -H 'Content-Type: application/json' -d @- <<BODY
{
  "emails": [
        "a@b.com",
        "b@c.com"
  ]
}
BODY

## gist:2229643
Why would you need this?
Because NxServer or VNC needs a special client installed in order to connect.
If your destination Ubuntu machine has multiple displays installed, you will eventually go crazy configuring it to be correctly seen from a Windows machine with a single display. It will show you 2 desktops on a single monitor...

Enabling Windows style RDP server in Ubuntu in easy.

Steps:
1. sudo apt-get install xrdp
2. cd ~
3. echo "gnome-session --session=gnome-classic" > .xsession

## Configure meld as git diff and merge tool
# inspired from http://nathanhoad.net/how-to-meld-for-git-diffs-in-ubuntu-hardy
# and http://gitguru.com/2009/02/22/integrating-git-with-a-visual-merge-tool/

sudo apt-get install meld

# create a python script with the below content and name it diff.py


#!/usr/bin/python

## gist:9661756
1) in file /var/lib/pgsql/9.3/data/postgresql.conf change the default value 'localhost' to '*' (all) as shown

listen_addresses = '*'

2) in file /var/lib/pgsql/9.3/data/pg_hba.conf add line:

host   all             all             all			password

3) if it still does not work, you bet it's iptables fault. so either stop it temporarily to verify this or add an exception for port 5432

## Maven multi-module build options
# Inspired from http://blog.akquinet.de/2010/05/26/mastering-the-maven-command-line-%E2%80%93-reactor-options/

# Build only specific modules:
mvn clean install -pl sub-module-name2
mvn clean install -pl sub-module-name2,sub-module-name3

# Build only starting from specific sub-module (resume from)
mvn clean install -rf sub-module-name2

# Build dependencies (also make)

## Launch linux terminal from Eclipse
1. Select new launch configuration

2. use /usr/bin/nohup for location

3. leave the working directory empty

4. for argument enter:
gnome-terminal --working-directory=${resource_loc}

5. Save and then you are able to run it while having different locations selected in package explorer: this will open the terminal in the corresponding directories

## gist:2230082
Sharing your Git repository using Git daemon (for pull & push)

1. In a git repository run the following command to share it in read-only mode (pull only):

git daemon --export-all --base-path=.

(from the folder with the project to be shared)

and then clone directly, like:

## Linux which application-process uses a given port
# run:
sudo netstat -lpn |grep :8080

# this will output something like:

tcp6       0      0 :::8080
:::*                    LISTEN      6782/java

# interpretation:

## Git: undo git rm for a single file
git checkout HEAD path/to/file

# Without HEAD it's not working because the file is not there anymore

## Capture packages with tcpdump or tcpflow
# packages from localhost to localhost
sudo tcpdump -vvv -A -i lo port 8080

# packages from localhost to somewhere else
sudo tcpdump -vvv -A host 192.168.1.101

# packages coming and going on a specific port, specific interface
sudo tcpdump -vvv -A -i eth0 'port 8080'

# packages coming and going on a specific port, any interface
	curl -X PATCH http://localhost:8080/Users/7234e4cd-eb7f-4a96-953e-3bd11439efcf -H 'Content-Type: application/json' -d @- <<BODY
	{
	"emails": [
	"a@b.com",
	"b@c.com"
	]
	}
	BODY
	Why would you need this?
	Because NxServer or VNC needs a special client installed in order to connect.
	If your destination Ubuntu machine has multiple displays installed, you will eventually go crazy configuring it to be correctly seen from a Windows machine with a single display. It will show you 2 desktops on a single monitor...

	Enabling Windows style RDP server in Ubuntu in easy.

	Steps:
	1. sudo apt-get install xrdp
	2. cd ~
	3. echo "gnome-session --session=gnome-classic" > .xsession
	# inspired from http://nathanhoad.net/how-to-meld-for-git-diffs-in-ubuntu-hardy
	# and http://gitguru.com/2009/02/22/integrating-git-with-a-visual-merge-tool/

	sudo apt-get install meld

	# create a python script with the below content and name it diff.py


	#!/usr/bin/python
	1) in file /var/lib/pgsql/9.3/data/postgresql.conf change the default value 'localhost' to '*' (all) as shown

	listen_addresses = '*'

	2) in file /var/lib/pgsql/9.3/data/pg_hba.conf add line:

	host all all all password

	3) if it still does not work, you bet it's iptables fault. so either stop it temporarily to verify this or add an exception for port 5432
	# Inspired from http://blog.akquinet.de/2010/05/26/mastering-the-maven-command-line-%E2%80%93-reactor-options/

	# Build only specific modules:
	mvn clean install -pl sub-module-name2
	mvn clean install -pl sub-module-name2,sub-module-name3

	# Build only starting from specific sub-module (resume from)
	mvn clean install -rf sub-module-name2

	# Build dependencies (also make)
	1. Select new launch configuration

	2. use /usr/bin/nohup for location

	3. leave the working directory empty

	4. for argument enter:
	gnome-terminal --working-directory=${resource_loc}

	5. Save and then you are able to run it while having different locations selected in package explorer: this will open the terminal in the corresponding directories
	Sharing your Git repository using Git daemon (for pull & push)

	1. In a git repository run the following command to share it in read-only mode (pull only):

	git daemon --export-all --base-path=.

	(from the folder with the project to be shared)

	and then clone directly, like:
	# run:
	sudo netstat -lpn \|grep :8080

	# this will output something like:

	tcp6 0 0 :::8080
	:::* LISTEN 6782/java

	# interpretation:
	git checkout HEAD path/to/file

	# Without HEAD it's not working because the file is not there anymore
	# packages from localhost to localhost
	sudo tcpdump -vvv -A -i lo port 8080

	# packages from localhost to somewhere else
	sudo tcpdump -vvv -A host 192.168.1.101

	# packages coming and going on a specific port, specific interface
	sudo tcpdump -vvv -A -i eth0 'port 8080'

	# packages coming and going on a specific port, any interface