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AWScloud~5 mins

Basic CLI commands (s3, ec2) in AWS - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What command lists all your S3 buckets using AWS CLI?
Use aws s3 ls to list all your S3 buckets. It shows bucket names and creation dates.
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beginner
How do you create a new S3 bucket named 'mybucket' in AWS CLI?
Use aws s3 mb s3://mybucket. 'mb' means make bucket.
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intermediate
Which command shows all running EC2 instances?
Use aws ec2 describe-instances --filters Name=instance-state-name,Values=running to see running EC2 instances.
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beginner
How to start an EC2 instance with ID 'i-1234567890abcdef0' using AWS CLI?
Use aws ec2 start-instances --instance-ids i-1234567890abcdef0 to start the instance.
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beginner
What command copies a file 'photo.jpg' from your computer to an S3 bucket 'mybucket'?
Use aws s3 cp photo.jpg s3://mybucket/ to copy the file to the bucket.
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Which AWS CLI command lists all your S3 buckets?
Aaws s3 list-buckets
Baws s3 ls
Caws s3 show
Daws s3 get-buckets
How do you stop an EC2 instance with ID 'i-abc123'?
Aaws ec2 stop-instances --instance-ids i-abc123
Baws ec2 shutdown --instance i-abc123
Caws ec2 terminate-instances --instance-ids i-abc123
Daws ec2 stop-instance --id i-abc123
Which command uploads a file 'data.txt' to S3 bucket 'mybucket'?
Aaws s3 cp data.txt s3://mybucket/
Baws s3 put data.txt s3://mybucket/
Caws s3 upload data.txt s3://mybucket/
Daws s3 send data.txt s3://mybucket/
What does the command aws ec2 describe-instances do?
ADeletes EC2 instances
BStarts all EC2 instances
CLists details of EC2 instances
DCreates a new EC2 instance
How to create a new S3 bucket named 'photos'?
Aaws s3 make-bucket photos
Baws s3 create-bucket photos
Caws s3 new-bucket photos
Daws s3 mb s3://photos
Explain how to list, create, and upload files to an S3 bucket using AWS CLI.
Think about commands starting with 'aws s3' and their short forms.
You got /3 concepts.
    Describe how to check running EC2 instances and start or stop an instance using AWS CLI.
    Focus on 'describe-instances', 'start-instances', and 'stop-instances' commands.
    You got /3 concepts.

      Practice

      (1/5)
      1. Which AWS CLI command lists all buckets in Amazon S3?
      easy
      A. aws s3 list-buckets
      B. aws ec2 ls
      C. aws ec2 describe-buckets
      D. aws s3 ls

      Solution

      1. Step 1: Understand the service for buckets

        Amazon S3 stores buckets, so the command must use aws s3.

      2. Step 2: Identify the correct action to list buckets

        The ls action lists buckets in S3. So aws s3 ls lists all buckets.

      3. Final Answer:

        aws s3 ls -> Option D

      4. Quick Check:

        List buckets = aws s3 ls [OK]
      Hint: Use 'aws s3 ls' to list buckets quickly [OK]
      Common Mistakes:
      • Confusing EC2 commands with S3 commands
      • Using 'list-buckets' which is not a valid CLI action
      • Trying to list buckets with 'aws ec2' commands
      2. Which command correctly starts an EC2 instance with ID i-1234567890abcdef0?
      easy
      A. aws ec2 start-instances --instance-ids i-1234567890abcdef0
      B. aws ec2 start-instance --instance-ids i-1234567890abcdef0
      C. aws ec2 start-instances --instance-id i-1234567890abcdef0
      D. aws ec2 start-instance --instance-id i-1234567890abcdef0

      Solution

      1. Step 1: Identify the correct EC2 start command

        The correct command to start instances is start-instances (plural).

      2. Step 2: Use the correct option name for instance IDs

        The option is --instance-ids (plural), not --instance-id.

      3. Final Answer:

        aws ec2 start-instances --instance-ids i-1234567890abcdef0 -> Option A

      4. Quick Check:

        Start instances = start-instances + --instance-ids [OK]
      Hint: Use plural 'start-instances' and '--instance-ids' options [OK]
      Common Mistakes:
      • Using singular 'start-instance' instead of 'start-instances'
      • Using '--instance-id' instead of '--instance-ids'
      • Mixing up EC2 and S3 commands
      3. What is the output of this command if the bucket my-bucket contains two files file1.txt and file2.txt? 
      aws s3 ls s3://my-bucket/
      medium
      A. Lists the names and sizes of file1.txt and file2.txt
      B. Shows an error: bucket not found
      C. Lists only the bucket name my-bucket
      D. Deletes the files in the bucket

      Solution

      1. Step 1: Understand the command purpose

        aws s3 ls s3://my-bucket/ lists objects inside the bucket my-bucket.

      2. Step 2: Predict the output for files in the bucket

        The command will show the file names and their sizes for file1.txt and file2.txt.

      3. Final Answer:

        Lists the names and sizes of file1.txt and file2.txt -> Option A

      4. Quick Check:

        List bucket contents = file names + sizes [OK]
      Hint: Use 'aws s3 ls s3://bucket/' to list files inside [OK]
      Common Mistakes:
      • Thinking it lists buckets instead of files
      • Expecting deletion or error output
      • Confusing bucket name listing with object listing
      4. You run this command but get an error: aws ec2 describe-instances --instance-ids i-1234567890abcdef0. What is the likely cause?
      medium
      A. The command should be aws s3 describe-instances
      B. The instance ID is incorrect or does not exist
      C. You must use start-instances instead of describe-instances
      D. You forgot to add --bucket option

      Solution

      1. Step 1: Check command correctness

        aws ec2 describe-instances --instance-ids is a valid command to get instance details.

      2. Step 2: Identify common error reasons

        An error usually means the instance ID is wrong or the instance does not exist in your account or region.

      3. Final Answer:

        The instance ID is incorrect or does not exist -> Option B

      4. Quick Check:

        Invalid instance ID causes describe-instances error [OK]
      Hint: Check instance ID spelling and region for describe-instances errors [OK]
      Common Mistakes:
      • Using S3 commands for EC2 tasks
      • Confusing describe with start commands
      • Adding irrelevant options like --bucket
      5. You want to copy a local file photo.jpg to an S3 bucket my-photos in a folder 2024/. Which command correctly does this?
      hard
      A. aws ec2 cp photo.jpg s3://my-photos/2024/
      B. aws s3 mv photo.jpg s3://my-photos/2024/
      C. aws s3 cp photo.jpg s3://my-photos/2024/
      D. aws s3 sync photo.jpg s3://my-photos/2024/

      Solution

      1. Step 1: Choose the correct AWS service and action

        Copying files to S3 uses aws s3 cp. EC2 commands do not handle S3 files.

      2. Step 2: Use the correct source and destination syntax

        Source is local file photo.jpg, destination is S3 path s3://my-photos/2024/.

      3. Final Answer:

        aws s3 cp photo.jpg s3://my-photos/2024/ -> Option C

      4. Quick Check:

        Copy local file to S3 = aws s3 cp [OK]
      Hint: Use 'aws s3 cp' to copy files to S3 buckets [OK]
      Common Mistakes:
      • Using 'mv' which moves instead of copies
      • Using 'sync' for single file copy
      • Using EC2 commands for S3 file operations