Right way to pass environment variables to exec shell command [duplicate]

Question

I'm using ruby 1.8.7 patch 249. Is the following the best/only way to pass environment variables to a shell command that I need to execute from my ruby program?

fork do           ENV['A'] = 'A'    exec "/bin/bash -c 'echo $A'" end  Process.wait 

Answer 1

There is a really easy way:

system({"MYVAR" => "42"}, "echo $MYVAR") 

All credit for this goes to Avdi: https://stackoverflow.com/a/8301399/171933