This is an example using the AWS SDK for Go to list ec2 instances ins…

example/service/ec2/instancesbyRegion/README.md

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+
+# Example  Fetch By region
+
+This is an example using the AWS SDK for Go to list ec2 instances instance state By different region . By default it fetch all running and stopped instance 
+
+
+# Usage
+
+
+```sh
+To fetch the stopped instance of all region use below:
+        ./filter_ec2_by_region --state running --state stopped
+To fetch the stopped and running instance  for  region us-west-1 and eu-west-1 use below:
+        ./filter_ec2_by_region --state running --state stopped --region us-west-1 --region=eu-west-1
+
+```
+
+Sample Output:
+```
+
+Fetching instace details  for region: ap-south-1 with criteria:  [running][stopped]**
+ printing instance details.....
+instance id i-************
+current State stopped
+done for region ap-south-1 ****
+
+
+
+Fetching instace details  for region: eu-west-2 with criteria:  [running][stopped]**
+ There is no instance for the for region eu-west-2 with the matching Criteria: [running][stopped]
+done for region eu-west-2 ****
+

example/service/ec2/instancesbyRegion/filter_ec2_by_region.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/ec2"
+)
+
+func fetchRegion() []string {
+
+	var regions []string
+	awsSession := session.Must(session.NewSession(&aws.Config{}))
+
+	svc := ec2.New(awsSession)
+	awsRegions, err := svc.DescribeRegions(&ec2.DescribeRegionsInput{})
+	if err != nil {
+		fmt.Println("Error", err)
+	}
+	for _, region := range awsRegions.Regions {
+		regions = append(regions, *region.RegionName)
+	}
+
+	return regions
+}
+
+func (i *commandLineArumentType) String() string {
+	return "my string representation"
+}
+
+func (i *commandLineArumentType) Set(value string) error {
+	*i = append(*i, value)
+	return nil
+}
+
+type commandLineArumentType []string
+
+func parseArguments() ([]*string, []string) {
+	var StateArguments, RegionArguments commandLineArumentType
+	States := []*string{}
+	Regions := []string{}
+	flag.Var(&StateArguments, "state", "state list")
+	flag.Var(&RegionArguments, "region", "region list")
+	flag.Parse()
+	if flag.NFlag() != 0 {
+		for i := 0; i < len(StateArguments); i++ {
+			States = append(States, &StateArguments[i])
+		}
+
+		for i := 0; i < len(RegionArguments); i++ {
+			Regions = append(Regions, RegionArguments[i])
+		}
+	}
+
+	return States, Regions
+}
+
+func usage() string {
+
+	message := "\n\nMissing mandatory flag 'state'. Please use like below  Example :\n\n"
+	message = message + "To fetch the stopped instance of all region use below:\n"
+	message = message + "\t./filter_ec2_by_region --state running --state stopped \n"
+	message = message + "To fetch the stopped and running instance  for  region us-west-1 and eu-west-1 use below:\n"
+	message = message + "\t./filter_ec2_by_region --state running --state stopped --region us-west-1 --region=eu-west-1\n"
+	return message
+
+}
+func main() {
+
+	Regions := []string{}
+	States := []*string{}
+	States, Regions = parseArguments()
+	if len(States) == 0 {
+		fmt.Fprintf(os.Stderr, "error: %v\n", usage())
+		os.Exit(1)
+	}
+	InstanceCriteria := " "
+	for _, State := range States {
+		InstanceCriteria = InstanceCriteria + "[" + *State + "]"
+	}
+
+	if len(Regions) == 0 {
+		Regions = fetchRegion()
+	}
+
+	for _, region := range Regions {
+		sess := session.Must(session.NewSession(&aws.Config{
+			Region: aws.String(region),
+		}))
+
+		ec2Svc := ec2.New(sess)
+		params := &ec2.DescribeInstancesInput{
+			Filters: []*ec2.Filter{
+				&ec2.Filter{
+					Name:   aws.String("instance-state-name"),
+					Values: States,
+				},
+			},
+		}
+
+		result, err := ec2Svc.DescribeInstances(params)
+		if err != nil {
+			fmt.Println("Error", err)
+		} else {
+			fmt.Printf("\n\n\nFetching instace details  for region: %s with criteria: %s**\n ", region, InstanceCriteria)
+			if len(result.Reservations) == 0 {
+				fmt.Printf("There is no instance for the for region %s with the matching Criteria:%s  \n", region, InstanceCriteria)
+			}
+			for _, reservation := range result.Reservations {
+
+				fmt.Println("printing instance details.....")
+				for _, instance := range reservation.Instances {
+					fmt.Println("instance id " + *instance.InstanceId)
+					fmt.Println("current State " + *instance.State.Name)
+				}
+			}
+			fmt.Printf("done for region %s **** \n", region)
+		}
+	}
+}