How set multiple env variables for a bash command

Question

I am supposed to set the EC2_HOME and JAVA_HOME variables before running a command (ec2-describe-regions)

How do I do that in one go?

Answer 1

If you want to use the environment variables multiple times in the same session you can use:

export VAR1=var1 VAR2=var2 VARN=varn

If you want to execute a command with multiple variables without affecting the current bash session, you can use:

VAR1=var1 VAR2=var2 VARN=varn command arg=1