Linux shell programming : loop control

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loop control

Here is a simple script to calculate the sum of a number from 1 to 10:

#!/bin/sh

sum=0
num=0

while [ $num -le 10 ]
do
        sum=`expr $sum + $num`
        echo "$num:$sum"
        if [ $num -eq 10 ]
        then
                echo "sum : $sum"
        fi
        num=`expr $num + 1`
done

Output:

0:0
1:1
2:3
3:6
4:10
5:15
6:21
7:28
8:36
9:45
10:55
sum : 55



break

The break statement is used to come out of a loop:

break

The break command can also be used to exit from a nested loop using this format:

break n

Sample 1:

#!/bin/sh

for i in 1 2 3 4 5
do
   for j in 10 20 30
   do
      if [ $i -eq 4 -a $j -eq 20 ]
      then
         break
      else
         echo "$i $j"
      fi
   done
done

When i=4 and j=20, the code exit from j-loop:

1 10
1 20
1 30
2 10
2 20
2 30
3 10
3 20
3 30
4 10
5 10
5 20
5 30

If we use break 2 instead of a simple break:

#!/bin/sh

for i in 1 2 3 4 5
do
   for j in 10 20 30
   do
      if [ $i -eq 4 -a $j -eq 20 ]
      then
         break 2
      else
         echo "$i $j"
      fi
   done
done

When the condition is met, it exits from the 2nd loop counting from inner most loop:

1 10
1 20
1 30
2 10
2 20
2 30
3 10
3 20
3 30
4 10



Linux - system, cmds & shell

  1. Linux Tips - links, vmstats, rsync
  2. Linux Tips 2 - ctrl a, curl r, tail -f, umask
  3. Linux - bash I
  4. Linux - bash II
  5. Linux - Uncompressing 7z file
  6. Linux - sed I (substitution: sed 's///', sed -i)
  7. Linux - sed II (file spacing, numbering, text conversion and substitution)
  8. Linux - sed III (selective printing of certain lines, selective definition of certain lines)
  9. Linux - 7 File types : Regular, Directory, Block file, Character device file, Pipe file, Symbolic link file, and Socket file
  10. Linux shell programming - introduction
  11. Linux shell programming - variables and functions (readonly, unset, and functions)
  12. Linux shell programming - special shell variables
  13. Linux shell programming : arrays - three different ways of declaring arrays & looping with $*/$@
  14. Linux shell programming : operations on array
  15. Linux shell programming : variables & commands substitution
  16. Linux shell programming : metacharacters & quotes
  17. Linux shell programming : input/output redirection & here document
  18. Linux shell programming : loop control - for, while, break, and break n
  19. Linux shell programming : string
  20. Linux shell programming : for-loop
  21. Linux shell programming : if/elif/else/fi
  22. Linux shell programming : Test
  23. Managing User Account - useradd, usermod, and userdel
  24. Linux Secure Shell (SSH) I : key generation, private key and public key
  25. Linux Secure Shell (SSH) II : ssh-agent & scp
  26. Linux Secure Shell (SSH) III : SSH Tunnel as Proxy - Dynamic Port Forwarding (SOCKS Proxy)
  27. Linux Secure Shell (SSH) IV : Local port forwarding (outgoing ssh tunnel)
  28. Linux Secure Shell (SSH) V : Reverse SSH Tunnel (remote port forwarding / incoming ssh tunnel) /)
  29. Linux Processes and Signals
  30. Linux Drivers 1
  31. tcpdump
  32. Linux Debugging using gdb
  33. Embedded Systems Programming I - Introduction
  34. Embedded Systems Programming II - gcc ARM Toolchain and Simple Code on Ubuntu/Fedora
  35. LXC (Linux Container) Install and Run
  36. Linux IPTables
  37. Hadoop - 1. Setting up on Ubuntu for Single-Node Cluster
  38. Hadoop - 2. Runing on Ubuntu for Single-Node Cluster
  39. ownCloud 7 install
  40. Ubuntu 14.04 guest on Mac OSX host using VirtualBox I
  41. Ubuntu 14.04 guest on Mac OSX host using VirtualBox II
  42. Windows 8 guest on Mac OSX host using VirtualBox I
  43. Ubuntu Package Management System (apt-get vs dpkg)
  44. RPM Packaging
  45. How to Make a Self-Signed SSL Certificate
  46. Linux Q & A
  47. DevOps / Sys Admin questions



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Linux - system, cmds & shell programming



Linux Tips - links, vmstats, rsync

Linux Tips 2 - ctrl a, curl r, tail -f, umask

Linux - bash I

Linux - bash II

Linux - Uncompressing 7z file

Linux - sed I (substitution: sed 's///', sed -i)

Linux - sed II (file spacing, numbering, text conversion and substitution)

Linux - sed III (selective printing of certain lines, selective definition of certain lines)

Linux - 7 File types : Regular, Directory, Block file, Character device file, Pipe file, Symbolic link file, and Socket file

Linux shell programming - introduction

Linux shell programming - variables and functions (readonly, unset, and functions)

Linux shell programming - special shell variables

Linux shell programming : arrays - three different ways of declaring arrays & looping with $*/$@

Linux shell programming : operations on array

Linux shell programming : variables & commands substitution

Linux shell programming : metacharacters & quotes

Linux shell programming : input/output redirection & here document

Linux shell programming : loop control - for, while, break, and break n

Linux shell programming : string

Linux shell programming : for-loop

Linux shell programming : if/elif/else/fi

Linux shell programming : Test

Managing User Account - useradd, usermod, and userdel

Linux Secure Shell (SSH) I : key generation, private key and public key

Linux Secure Shell (SSH) II : ssh-agent & scp

Linux Secure Shell (SSH) III : SSH Tunnel as Proxy - Dynamic Port Forwarding (SOCKS Proxy)

Linux Secure Shell (SSH) IV : Local port forwarding (outgoing ssh tunnel)

Linux Secure Shell (SSH) V : Reverse SSH Tunnel (remote port forwarding / incoming ssh tunnel) /)

Linux Processes and Signals

Linux Drivers 1

tcpdump

Linux Debugging using gdb

Embedded Systems Programming I - Introduction

Embedded Systems Programming II - gcc ARM Toolchain and Simple Code on Ubuntu/Fedora

LXC (Linux Container) Install and Run

Linux IPTables

Hadoop - 1. Setting up on Ubuntu for Single-Node Cluster

Hadoop - 2. Runing on Ubuntu for Single-Node Cluster

ownCloud 7 install

Ubuntu 14.04 guest on Mac OSX host using VirtualBox I

Ubuntu 14.04 guest on Mac OSX host using VirtualBox II

Windows 8 guest on Mac OSX host using VirtualBox I

Ubuntu Package Management System (apt-get vs dpkg)

RPM Packaging

How to Make a Self-Signed SSL Certificate

Linux Q & A

DevOps / Sys Admin questions




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DevOps



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AWS (Amazon Web Services)



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Docker & K8s



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Docker install on Ubuntu 14.04

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File sharing between host and container (docker run -d -p -v)

Linking containers and volume for datastore

Dockerfile - Build Docker images automatically I - FROM, MAINTAINER, and build context

Dockerfile - Build Docker images automatically II - revisiting FROM, MAINTAINER, build context, and caching

Dockerfile - Build Docker images automatically III - RUN

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Dockerfile - Build Docker images automatically V - WORKDIR, ENV, ADD, and ENTRYPOINT

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Docker Compose - Hashicorp's Vault and Consul Part C (Consul)

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Docker & Kubernetes : Setting up Ingress with NGINX Controller on Minikube (Mac)

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Terraform



Introduction to Terraform with AWS elb & nginx

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Terraform 12 Tutorial - Loops with count, for_each, and for

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Terraform Tutorial - Output variables

Terraform Tutorial - Destroy

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Terraform Tutorial - AWS ASG and Modules

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HashiCorp Vault Agent

HashiCorp Vault and Consul on AWS with Terraform

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Delegate Access Across AWS Accounts Using IAM Roles

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Terraform commands cheat sheet

Terraform Cloud

Terraform 14

Creating Private TLS Certs





Ansible 2.0



What is Ansible?

Quick Preview - Setting up web servers with Nginx, configure environments, and deploy an App

SSH connection & running commands

Ansible: Playbook for Tomcat 9 on Ubuntu 18.04 systemd with AWS

Modules

Playbooks

Handlers

Roles

Playbook for LAMP HAProxy

Installing Nginx on a Docker container

AWS : Creating an ec2 instance & adding keys to authorized_keys

AWS : Auto Scaling via AMI

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Deploying Wordpress micro-services with Docker containers on Vagrant box via Ansible

Setting up Apache web server

Deploying a Go app to Minikube

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Jenkins



Install

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Managing_plugins

Git/GitHub plugins, SSH keys configuration, and Fork/Clone

JDK & Maven setup

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Commit to changes to GitHub & new test results - Successful Build

Adding code coverage and metrics

Jenkins on EC2 - creating an EC2 account, ssh to EC2, and install Apache server

Jenkins on EC2 - setting up Jenkins account, plugins, and Configure System (JAVA_HOME, MAVEN_HOME, notification email)

Jenkins on EC2 - Creating a Maven project

Jenkins on EC2 - Configuring GitHub Hook and Notification service to Jenkins server for any changes to the repository

Jenkins on EC2 - Line Coverage with JaCoCo plugin

Setting up Master and Slave nodes

Jenkins Build Pipeline & Dependency Graph Plugins

Jenkins Build Flow Plugin

Pipeline Jenkinsfile with Classic / Blue Ocean

Jenkins Setting up Slave nodes on AWS

Jenkins Q & A





Puppet



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Puppet with Amazon AWS II (ssh & puppetmaster/puppet install)

Puppet with Amazon AWS III - Puppet running Hello World

Puppet Code Basics - Terminology

Puppet with Amazon AWS on CentOS 7 (I) - Master setup on EC2

Puppet with Amazon AWS on CentOS 7 (II) - Configuring a Puppet Master Server with Passenger and Apache

Puppet master /agent ubuntu 14.04 install on EC2 nodes

Puppet master post install tasks - master's names and certificates setup,

Puppet agent post install tasks - configure agent, hostnames, and sign request

EC2 Puppet master/agent basic tasks - main manifest with a file resource/module and immediate execution on an agent node

Setting up puppet master and agent with simple scripts on EC2 / remote install from desktop

EC2 Puppet - Install lamp with a manifest ('puppet apply')

EC2 Puppet - Install lamp with a module

Puppet variable scope

Puppet packages, services, and files

Puppet packages, services, and files II with nginx Puppet templates

Puppet creating and managing user accounts with SSH access

Puppet Locking user accounts & deploying sudoers file

Puppet exec resource

Puppet classes and modules

Puppet Forge modules

Puppet Express

Puppet Express 2

Puppet 4 : Changes

Puppet --configprint

Puppet with Docker

Puppet 6.0.2 install on Ubuntu 18.04





Chef



What is Chef?

Chef install on Ubuntu 14.04 - Local Workstation via omnibus installer

Setting up Hosted Chef server

VirtualBox via Vagrant with Chef client provision

Creating and using cookbooks on a VirtualBox node

Chef server install on Ubuntu 14.04

Chef workstation setup on EC2 Ubuntu 14.04

Chef Client Node - Knife Bootstrapping a node on EC2 ubuntu 14.04





Vagrant



VirtualBox & Vagrant install on Ubuntu 14.04

Creating a VirtualBox using Vagrant

Provisioning

Networking - Port Forwarding

Vagrant Share

Vagrant Rebuild & Teardown

Vagrant & Ansible





Redis In-Memory Database



Redis vs Memcached

Redis 3.0.1 Install

Setting up multiple server instances on a Linux host

Redis with Python

ELK : Elasticsearch with Redis broker and Logstash Shipper and Indexer



Git/GitHub Tutorial



One page express tutorial for GIT and GitHub

Installation

add/status/log

commit and diff

git commit --amend

Deleting and Renaming files

Undoing Things : File Checkout & Unstaging

Reverting commit

Soft Reset - (git reset --soft <SHA key>)

Mixed Reset - Default

Hard Reset - (git reset --hard <SHA key>)

Creating & switching Branches

Fast-forward merge

Rebase & Three-way merge

Merge conflicts with a simple example

GitHub Account and SSH

Uploading to GitHub

GUI

Branching & Merging

Merging conflicts

GIT on Ubuntu and OS X - Focused on Branching

Setting up a remote repository / pushing local project and cloning the remote repo

Fork vs Clone, Origin vs Upstream

Git/GitHub Terminologies

Git/GitHub via SourceTree I : Commit & Push

Git/GitHub via SourceTree II : Branching & Merging

Git/GitHub via SourceTree III : Git Work Flow

Git/GitHub via SourceTree IV : Git Reset

Git Cheat sheet - quick command reference






Subversion

Subversion Install On Ubuntu 14.04

Subversion creating and accessing I

Subversion creating and accessing II



Powershell 4 Tutorial



Powersehll : Introduction

Powersehll : Help System

Powersehll : Running commands

Powersehll : Providers

Powersehll : Pipeline

Powersehll : Objects

Powershell : Remote Control

Windows Management Instrumentation (WMI)

How to Enable Multiple RDP Sessions in Windows 2012 Server

How to install and configure FTP server on IIS 8 in Windows 2012 Server

How to Run Exe as a Service on Windows 2012 Server

SQL Inner, Left, Right, and Outer Joins