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# Assumptions
- OpenSSL is installed
- base working directory is /usr/lib/ssl/misc

# Create new certificate authority, created in demoCA directory
sudo ./CA.pl -newca

# Sign a certificate request using CA created above
sudo openssl x509 -req -CA demoCA/cacert.pem -CAkey demoCA/private/cakey.pem -in newreq.pem -out localhost.cer -days 1460 -CAcreateserial

annagapuz

# Number indicates size, in bytes, to leave. Can run on a file that is currently being written to, like server logs.
sudo truncate -s 4 server.log

# Deletes files and directories older than 7 days
sudo find <full path dir> -ctime +7 -exec rm -rf {} \;

# Disk space
df
df -h // human-readable

annagapuz

Grails externalized configuration files:

If you want to include a config groovy class, you have to include it as an object in the config location list.

Despite the comments saying this:

// grails.config.locations = [ "classpath:${appName}-config.properties",
//                             "classpath:${appName}-config.groovy",
//                             "file:${userHome}/.grails/${appName}-config.properties",
//                             "file:${userHome}/.grails/${appName}-config.groovy"]

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// Long-Polling is used in this example b/c of IE7

// Add atmosphere to ApplicationResources.groovy
modules = {
...
	atmosphere {
		dependsOn 'jquery'
		resource url:'js/atmosphere.js' // used jQuery atmosphere minified
	}
}

annagapuz

Benchmark your SSD or hard disk speed 
    
To test write speed:
time dd if=/dev/zero bs=1024k of=tstfile count=1024

To test read speed:
time dd if=tstfile bs=1024k of=/dev/null count=1024

hdiutil convert -format UDRW -o ubcd.img /ubcd537.iso

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Ended up being too memory intensive, but it worked:

==================================================

wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -

sudo sh -c 'echo deb https://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'

sudo apt-get update

annagapuz

import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import javax.net.ssl.SSLServerSocketFactory;

public class Ciphers
{
    public static void main(String[] args)
        throws Exception
    {

annagapuz

/**
* fieldIdentifier = objectRoot.foo[0].bar, fieldValue = abc
* fieldIdentifier = objectRoot.foo[1].bar, fieldValue = xyz
*/

public final class SimpleJsonGenerator {

    private static final Set<String> ARRAY_NODES = getArrayNodes();
    private static final String BASE_JSON_PATH = "objectRoot";

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/**
* fieldIdentifier = //ROOT/FOO[0], fieldValue = abc
* fieldIdentifier = //ROOT/FOO[1]/@Bar, fieldValue = xyz
*/

public class SimpleXmlGenerator {

    public static String createXml(String xmlRootName, List<FieldEnumeration> inputFields) {
        StringBuilder xmlString = new StringBuilder("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
        buildXml(xmlString, buildXmlNodes(xmlRootName, inputFields));

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public class JsonSchemaUtility {

    public static void main(String[] args) throws Exception {
        ObjectMapper objectMapper = new ObjectMapper();
        // Serialize a LocalDate using the corresponding ISO formatter
        objectMapper.registerModule(new SimpleModule().addSerializer(new LocalDateSerializer(DateTimeFormatter.ISO_LOCAL_DATE)));
        // Serialize a OffsetDateTime using the corresponding custom formatter
        objectMapper.registerModule(new SimpleModule().addSerializer(new CustomOffsetDateTimeSerializer(OffsetDateTime.class)));
        // Serialize a Year using the corresponding ISO formatter
        objectMapper.registerModule(new SimpleModule().addSerializer(YearSerializer.INSTANCE));