How to Determine if a Bash Variable is Empty
If you need to check if a bash variable is empty, or unset, then you can use the following code:
if [ -z "${VAR}" ];
The above code will check …
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131 articles about cli development, tools, and best practices
How to Order by File Size using the du command in Linux
If you use the du command to list all the file sizes on Linux:
du
# or
du -h # Human readable
Then you would have noticed that they are not ordered by …
Read Article →How to Resize an AWS EBS Volume in Bash
If you need to resize an EBS volume in AWS, you can do so using bash.
Step 1 – Create a bash file
Create a bash file called resize.sh:
#!/bin/bash …How to Setup Credential Helper for AWS CodeCommit
AWS CodeCommit is a git code repository service by Amazon Web Services.
You will want to clone your repository and setup your remotes using credential …
How to Approve a SageMaker model in AWS CLI
Sometimes you will need to manually approve a SageMaker model package from the AWS CLI.
Step 1 – Get a list of the available packages
aws sagemaker …How to Recursively Delete all Files in an AWS S3 Bucket
If you need to recursively delete all files in an AWS S3 bucket, then you can do the following:
aws s3 rm --recursive s3://your-bucket-name/foo/bar/ …How to get CPU Frequency in Linux
If you need to get the CPU Frequency in Linux, then you can run the following command:
watch -n.1 "grep \"^[c]pu MHz\" /proc/cpuinfo"
[Solved] Instance Profile already exists in Terraform
If you get the Instance Profile already exists error when running your Terraform apply, then it is either because an instance profile with that name …
[Solved] An error occurred (UnauthorizedException) when calling ListAccounts operation: Session token not found or invalid
If you are using aws configure sso to populate your ~/.aws/credentials file and you get the following error when you try and reauthorize, then you can …
How to Match Multiple Strings with grep
If you need to match a string in a file, then grep is your friend.
An example of using grep
Let’s take a file called somefile.txt
this
is
a
test …How to Invoke an AWS Lambda from the CLI
If you want to invoke an AWS Lambda from your CLI, then the best option is to have the AWS CLI installed.
Getting started with the AWS CLI – AWS …
Read Article →How to Exit if a Bash Variable in Not Set
Sometimes you might want to exit a command if a variable is not set in Bash.
You can do this as follows:
if [ -z "$VARIABLE_NAME" ]; then echo …