Conditionally set global variables in a bash script [duplicate] - zsh

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Can a shell script set environment variables of the calling shell? [duplicate]
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I am trying to write a bash script that will take a single argument("prod" or "staging"), and use that to conditionally set global environment variables, specifically to switch between my staging and prod AWS keys. However, even though my logs in the script show what I expect, running echo $AWS_ACCESS_KEY in my terminal after running the script, does not show it was updated. I have tried adding source ~/.zshrc but I don't think that is needed. What can I change to update the $AWS_ACCESS_KEY globally?
#!/bin/bash
tmpAccess="access"
tmpSecret="secret"
if [ $1 == "prod" ];
then
echo "Setting the AWS KEYS to $1 keys"
tmpAccess=$PROD_ACCESS_KEY
tmpSecret=$PROD_SECRET_KEY
elif [ $1 == "staging" ];
then
echo "Setting the AWS KEYS to $1 keys"
tmpAccess=$STAGING_ACCESS_KEY
tmpSecret=$STAGING_SECRET_KEY
else
echo "Unknown env passed in: $1"
fi
export AWS_ACCESS_KEY=$tmpAccess
export AWS_SECRETS_KEY=$tmpSecret
echo "Updated AWS_ACCESS_KEY: $AWS_ACCESS_KEY"
echo "Current tmpAccess: $tmpAccess"
echo "AWS_ACCESS_KEY has been updated to $AWS_ACCESS_KEY for env $1"
echo "AWS_SECRETS_KEY has been updated to $AWS_SECRETS_KEY for env $1"
source ~/.zshrc
My zshrc file looks similar to:
export STAGING_ACCESS_KEY=1234
export STAGING_SECRETS_KEY=abcd
export PROD_ACCESS_KEY=5678
export PROD_SECRETS_KEY=efgh

Answer 1

Clearly, it's not possible to put in a script a program to modify a variable in the current terminal except if you accept to source it (see Setting environment variable in shell script does not make it visible to the shell).
There is another solution. Put your script content in a function:
myfunctionName () {
tmpAccess="access"
tmpSecret="secret"
if [ $1 == "prod" ];
then
echo "Setting the AWS KEYS to $1 keys"
tmpAccess=$PROD_ACCESS_KEY
tmpSecret=$PROD_SECRET_KEY
elif [ $1 == "staging" ];
then
echo "Setting the AWS KEYS to $1 keys"
tmpAccess=$STAGING_ACCESS_KEY
tmpSecret=$STAGING_SECRET_KEY
else
echo "Unknown env passed in: $1"
fi
export AWS_ACCESS_KEY=$tmpAccess
export AWS_SECRETS_KEY=$tmpSecret
echo "Updated AWS_ACCESS_KEY: $AWS_ACCESS_KEY"
echo "Current tmpAccess: $tmpAccess"
echo "AWS_ACCESS_KEY has been updated to $AWS_ACCESS_KEY for env $1"
echo "AWS_SECRETS_KEY has been updated to $AWS_SECRETS_KEY for env $1"
}
and put this function in your .zshrc file.
After that, launch a new terminal and call your myfunctionName function like the script filename.