I’ve got a home account & a work account. I need to easily swap between the 2.
Add 2 sets of creds
~/.aws/credentials

[default]
aws_access_key_id=AKIAIOSFODNN7EXAMPLE
aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY

[work]
aws_access_key_id=AKIAI44QH8DHBEXAMPLE
aws_secret_access_key=je7MtGbClwBF/2Zp9Utk/h3yCo8nvbEXAMPLEKEY

Add 2 sets of region / outputs
~/.aws/config

[default]
region=us-west-2
output=json

[profile work]
region=us-east-1
output=text

Then to use a profile:

export AWS_PROFILE=work

OR

aws ec2 describe-instances --profile work

SOURCE