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setup a clojure project
-------------------------
* Use `mvn archetype:generate` to create a project. (archetype id 845 for sample clojure project)

* add the nrepl dependency 
  <dependency>
    <groupId>org.clojure</groupId>
    <artifactId>tools.nrepl</artifactId>
    <version>0.2.0-beta9</version>
  </dependency>

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Get the md5sum for files in a directory
----------------------------------------
$ ls | xargs md5sum

If the file name contains white space, set the delimiter to new line (default delimiter is white space)
$ ls | xargs -d'\n' md5sum

Estimate the directories / files size 
$ ls | xargs du -sh 

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*
When scp ing a file which has white spaces in its name have to escape twice,

because it's escaped locally and then on the remote end.

There are a couple of options you can do (in bash):

scp user@example.com:"'web/tmp/Master File 18 10 13.xls'" .
scp user@example.com:"web/tmp/Master\ File\ 18\ 10\ 13.xls" .
scp user@example.com:web/tmp/Master\\\ File\\\ 18\\\ 10\\\ 13.xls .

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$ echo "abc"
abc

$ echo "abc" | sed 's/b/z/'
azc

$ echo "abcb" | sed 's/b/z/'
azcb

$ echo "abcb" | sed 's/b/z/g'

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<%
var carbon = require('carbon');
var server = new carbon.server.Server();
var options = {system: true,  domain: carbon.server.tenantDomain() , tenantId: carbon.server.tenantId()};
var dataStore = new carbon.registry.Registry(server, options);
var res;
var mycontent;
var path = "/_system/governance/sen/hello";
try {
    res = dataStore.get(path);

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mvn -Dmaven.surefire.debug test --> surefire test

mvn versions:set -DnewVersion=2.50.1-M1 --> manually set version 
      mvn versions:commit --> apply the changes
      mvn versions:revert --> revert the changes
      
mvn -Dmaven.repo.local=$HOME/.my/other/repository clean install


mvn -Dtest=org.my.pkg.Hello#testGreet test

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public class Sierpinski {
    public static void main(String[] args) {
        int no_of_row = 50;
        int[][] tri = new int[no_of_row][no_of_row];

        for (int i = 0; i < no_of_row; i++) {
            for (int j = 0; j <= i; j++) {
                if (j == 0 || j == i) {
                    tri[i][j] = 1;
                }

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#!/bin/bash
if [ "$#" -ne 3 ]; then
        echo "usage: sh thread-analyze.sh <pid> <number-of-dumps> <interval>"
        exit
fi

count=$2
for i in `seq 1 $count`;
do
        jstack -l $1 > thread_dump_`date "+%F-%T"`.txt &

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#!/bin/bash

if [ "$#" -ne 2 ]; then
        echo "usage: sh top-consumers.sh <pid> <number-of-consumers>"
        exit
fi

lowerBound=$(expr "$2" + 1) 

        jstack -l $1 > top-consumers_thread_dump.txt &

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#! /bin/bash

for i in $(seq 1  408)
do
        f=seg-$i-v1-a1.ts
#       echo $f
        wget "<URL>/$f"
        cat $f >> all.ts
        rm $f
done