Run any statement/command in all k8s pods with name matching a regex within a given context

	#!/bin/bash -e
	# runInPods.sh
	# @description run any statement in all k8s pods with name matching a regex within a given context (kubectl config view ).
	# @author Nestor Urquiza
	# @date 20180929
	#
	# @example1 For my-project, in my-cluster, in pods named '*nodejs*', run the 'ps -ef | grep node' command
	# ./runInPods.sh -c gke_my-project_us-east1-b_my-cluster -r nodejs -s "ps -ef | grep node"
	#
	# options
	while [[ $# -gt 1 ]]; do
	key="$1"
	case $key in
	-c|--context)
	context="$2"
	shift
	;;
	-r|-regex)
	regex="$2"
	shift
	;;
	-s|--statement)
	statement="$2"
	shift
	;;
	*)
	# unknown
	;;
	esac
	shift
	done
	# functions
	function fail() {
	echo $1
	echo $USAGE
	exit 1
	}
	# main
	USAGE="Usage: `basename $0` (-c, --context --- from 'kubectl config view') [-r, --regex --- defaults to all)] (-s, --statement --- any valid command)"
	if [ "$context" == "" ]; then
	fail "Context is mandatory. Find available contexts by running 'kubectl config view'"
	fi
	if [ "$regex" == "" ]; then
	regex=.
	fi
	if [ "$statement" == "" ]; then
	fail "Statement is mandatory. Use any linux command you want to run in the matching pod(s)'"
	fi
	kubectl config use-context $context
	command="cat <("
	for line in $(kubectl get pods | \
	grep "$regex" | grep Running | awk '{print $1}'); do
	command="kubectl exec -i $line -- $statement"
	echo "Running $statement in $line"
	eval "$command"
	done

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