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zip multiple files into one zip

How to zip multiple files into one zip file.

Using zip.

zip test.zip *.txt

Using tar.

tar cvzf test.tar.gz *.txt

Untar in current directory or specify another directory.

tar xvzf test.tar.gz .
tar xvzf test.tar.gz -C /path/to/dir

Git Clone Multiple Accounts

How to clone repositories with multiple Github accounts.

git clone git@github.com-yourgitaccount:yourgitaccount/myrepo.git

AWS S3 Sync Between Accounts

Here’s how to sync S3 buckets between 2 different AWS accounts. Assuming buckets are already created.

  1. Setup bucket permissions in Account A
  2. Setup IAM user with permissions in Account B
  3. Setup bucket permissions in Account B
  4. Run S3 sync from Account B.

Account A bucket permissions. Account and user are from Account B.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "DelegateS3Access",
            "Effect": "Allow",
            "Principal": {"AWS": "arn:aws:iam::222222222222:user/Jane"},
            "Action": ["s3:ListBucket","s3:GetObject"],
            "Resource": [
                "arn:aws:s3:::awsexamplesourcebucket/*",
                "arn:aws:s3:::awsexamplesourcebucket"
            ]
        }
    ]
}

Create IAM user (Jane) in Account B

aws iam create-user --user-name Jane

Give IAM user (Jane) access to both buckets.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::awsexamplesourcebucket",
                "arn:aws:s3:::awsexamplesourcebucket/*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:PutObject",
                "s3:PutObjectAcl"
            ],
            "Resource": [
                "arn:aws:s3:::awsexampledestinationbucket",
                "arn:aws:s3:::awsexampledestinationbucket/*"
            ]
        }
    ]
}

Sync the buckets

aws s3 sync s3://awsexamplesourcebucket s3://awsexampledestinationbucket

AWS CLI S3 Recursive Copy

Here’s how to copy multiple files recursively using AWS CLI. The S3 cp command by default only copies a single file. To copy multiple files, you have to use the –recursive option along with –exclude and –include. In this example, we will exclude every file, but include only files with a json extension.

aws s3 cp /tmp/folder s3://bucket/folder \
  --recursive
  --exclude "*"
  --include "*.json"

The result:

upload: ./abc.json to s3://bucket/folder/abc.json    
upload: ./xyz.json to s3://bucket/folder/xyz.json

GCP Start Multiple Instances

Here’s how to start multiple instances using Bash and Google SDK.

#!/bin/bash
while IFS=', ' read -r a b c; do
  instance="${a//[[:blank:]]/}"
  project="${b//[[:blank:]]/}"
  zone="${c//[[:blank:]]/}"
  echo "Starting $instance ...."
  gcloud compute instances start $instance \
  --zone $zone --project $project --async
done < instance-list.txt

Instances are read from an external file. The file format is displayed below.

server1,project1,us-central1-a
server2,project2,us-central1-b
server3,project3,us-central1-c

To stop multiple instances, replace “start” with “stop.”

Multi-Column CSS

If you have a long list of words laid out on a page (see list below), it might be better to place them in a multi-column page format. CSS3 makes this entirely possible without using tables or multiple divs. All we need is a single div for the entire list. In this example, we will work with a list of animals. We will use a div class called “animals.”

aardvark beetle camel dog elephant fox goat hen iguana jackal kangaroo lion

To use multi-columns, we simply style the div with:

.animals {-moz-column-count:3; -webkit-column-count:3; column-count:3;}

Multi-column divs is supported on Firefox, Safari, Chrome and IE browsers.

Multi-Column Example

aardvark
beetle
camel
dog
elephant
fox
goat
hen
iguana
jackal
kangaroo
lion

Just change the numbers to make multiple columns.