dzlab

# print the number of columns 
gawk '{print NF}' file | sort -nu | tail -n 1
# Use head -n 1 for lowest column count, tail -n 1 for highest column count.

# print columns
gawk '{print $0}' file        # all columns
gawk '{print $4}' file        # 4th column
gawk -F "," '{print $2}' file # specific separator

# split a string with a delimiter into lines

dzlab

# Virtualbox: Mount the shared folder 
sudo mount -t vboxsf temp Shared

# process listening on a port (e.g. 5000)
lsof -i :5000                                  # find the process
lsof -i :80                                    # find the program running on a port
kill -9 PID                                    # kill process
sudo netstat -lpn |grep :5000
netstat -tan | grep ':80 ' | awk '{print $6}' | sort | uniq -c # view list of connections and their states
ss -rota | less                                # list all connections and timers

dzlab

#!/usr/bin/env bash
##
## This script install prerequisites: git, virtualbox, vagrant, ruby/rubygems. 
## Then, it boots up bosh-lite in a local Vagrant/Virtualbox VM,
## then uploads and deploys Cloud Foundry into it.
## Finally, it logs into Cloud Foundry as an admin user,
## creates an initial organization and space,
## then deploys an example application.
##

dzlab

apiVersion: v1
kind: Namespace
metadata:
  name: spark-operator
---
apiVersion: v1
kind: Namespace
metadata:
  name: spark-apps
---

dzlab

Name:         mnist-tensorflow-job
Namespace:    default
Labels:       <none>
Annotations:  API Version:  kubeflow.org/v1
Kind:         TFJob
Metadata:
  Creation Timestamp:  2020-07-18T18:54:31Z
  Generation:          1
  Resource Version:    43041
  Self Link:           /apis/kubeflow.org/v1/namespaces/default/tfjobs/mnist-tensorflow-job

dzlab

package main

import (
  "github.com/pkg/sftp"
  "golang.org/x/crypto/ssh"
)

func main() {
  addr := “my_ftp_server:22"
  config := &ssh.ClientConfig{

dzlab

#!/bin/bash
echo "Building NGINX along with Echo module"

# install prerequisites
yum -y install gcc gcc-c++ make zlib-devel pcre-devel openssl-devel

# download the Echo module
curl -L -O 'https://github.com/openresty/echo-nginx-module/archive/v0.58.tar.gz'
tar -xzvf v0.58.tar.gz && rm v0.58.tar.gz
mv echo-nginx-module-0.58 /tmp/echo-nginx-module