https://github.com/aws-samples/ecs-blue-green-deployment
https://github.com/devops-recipes/provision-ecs-cluster-terraform/blob/master/provision-cluster/application-load-balancer.tf
https://github.com/tmknom/terraform-aws-codedeploy-for-ecs/blob/master/main.tf
https://github.com/gnokoheat/ecs-with-codepipeline-example-by-terraform
https://github.com/awsdocs/aws-codepipeline-user-guide/blob/master/doc_source/pipelines-create.md https://github.com/cloudposse/terraform-aws-ecs-codepipeline
https://www.computerhope.com/unix/wget.htm
docker download http://mirrors.jenkins.io/ github webhook: https://www.youtube.com/watch?v=PhxZamqYJws jenkins command line trigger: http://www.inanzzz.com/index.php/post/jnrg/running-jenkins-jobs-via-command-line
rename many files with the same pattern
for f in *.jpg; do mv "$f" "$(echo "$f" | sed s/IMG/VACATION/)"; done
http://www.freekb.net/
http://matt.might.net/articles/bash-by-example/
http://www.cse.lehigh.edu/~brian/course/2013/cunix/handouts/bash.quickref.pdf
http://matt.might.net/articles/perl-by-example/
https://www.programiz.com/python-programming/regex
https://github.com/Yavin/maven-ear-example/blob/master/pom.xml jenkins and Maven https://jenkins.io/blog/2017/02/07/declarative-maven-project/
https://stackoverflow.com/questions/10268583/downloading-java-jdk-on-linux-via-wget-is-shown-license-page-instead sudo /usr/sbin/alternatives --config java
https://www.well.ox.ac.uk/~johnb/comp/unix/ksh.html#principle http://www.bolthole.com/solaris/ksh.html
https://github.com/mbr/flask-bootstrap
https://www.freecodecamp.org/news/learn-the-basics-of-git-in-under-10-minutes-da548267cc91/