Java Shell

Force Garbage Collection
Since JDK 7 you can use the JDK command tool ‘jcmd’ such as:

jcmd <pid> GC.run

Import .p7b chain certificate with private key in keystore

Convert .p7b file to .pem

openssl pkcs7 -print_certs \
-in file.p7b \
-out file.pem 

Export .pem with private key in .p12

openssl pkcs12 -export \
-name aliasName \
-in file.pem \
-inkey file.key \
-out file.p12

Import .p12 file in keystore

keytool -importkeystore \
-srcstoretype pkcs12 \
-srckeystore file.p12 \
-destkeystore file.jks

Backup all MySQL databases

#! /bin/bash

TIMESTAMP=`date +%Y-%m-%d_%H-%M-%S`
BACKUP_DIR="/backup"
BACKUP_TIMESTAMP_DIR="$BACKUP_DIR/$TIMESTAMP"
MYSQL=/usr/bin/mysql
MYSQL_USER="user"
MYSQL_PASSWORD="pass"
MYSQLDUMP=/usr/bin/mysqldump

mkdir -p "$BACKUP_TIMESTAMP_DIR"

echo "Starting MySQL Backup";
echo `date`;

databases=`$MYSQL --user=$MYSQL_USER -p$MYSQL_PASSWORD -e "SHOW DATABASES;" | grep -Ev "(Database|mysql|information_schema|performance_schema)"`

for db in $databases; do
  echo "Dumping database: $db"
  $MYSQLDUMP --force --opt --skip-comments --compact --user=$MYSQL_USER -p$MYSQL_PASSWORD --single-transaction --databases $db | gzip > "$BACKUP_TIMESTAMP_DIR/$db.sql.gz"
done

tar -zcf "$TIMESTAMP.tar.gz" -C "$BACKUP_TIMESTAMP_DIR" .
rm -rf "$BACKUP_TIMESTAMP_DIR"

find "$BACKUP_DIR" -name "*.tar.gz" -mtime 182 -exec rm -f {} \;

echo "Finished MySQL Backup";
echo `date`;

Install Java 8 to OpenShift DIY cartridge

$> cd ${OPENSHIFT_DATA_DIR}
$> wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" \
   http://download.oracle.com/otn-pub/java/jdk/8u51-b16/jdk-8u51-linux-i586.tar.gz
$> tar -zxf jdk-8u51-linux-i586.tar.gz
$> export JAVA_HOME="${OPENSHIFT_DATA_DIR}jdk1.8.0_51"
$> export PATH=$JAVA_HOME/bin:$PATH

Swift UIColor extensions

extension UIColor {
    convenience init?(rgb: Int) {
        self.init(
            red:    CGFloat((rgb & 0xFF0000) >> 16) / 255.0,
            green:  CGFloat((rgb & 0xFF00) >> 8) / 255.0,
            blue:   CGFloat(rgb & 0xFF) / 255.0,
            alpha:  1.0)
    }

    convenience init?(rgba: Int) {
        self.init(
            red:    CGFloat((rgba & 0xFF000000) >> 32) / 255.0,
            green:  CGFloat((rgba & 0xFF0000) >> 16) / 255.0,
            blue:   CGFloat((rgba & 0xFF00) >> 8) / 255.0,
            alpha:  CGFloat(rgba & 0xFF) / 255.0)
    }
}

Usage

var color1 = UIColor(rgba: 0x435363FF)
var color2 = UIColor(rgb: 0x435363)

Mac OSX Yosemite Environment Variables

Add environment variables on Mac OSX Yosemite

Install Gradle Plugin for Eclipse

1. Go to http://spring.io/tools/sts/all and copy the URL from the Update Site you want.
   For Eclipse Luna is http://dist.springsource.com/release/TOOLS/update/e4.4/
2. Go to Eclipse and open
   Help -> Install New Software
3. Add the STS URL in Work with field
4. From the list select
   • Core / Eclipse Intergration for Gradle
   • Groovy-Eclipse (for DSL Support)