How to make the say command echo a variable value in a script?

Question

I\'m on a Mac and sometimes I use the say command at the end of my scripts, like so:

system(\'say \"Finished successfully\"\')

But

Answer 1

Remove backticks (Kernel#`):

system("say \"#{my_variable}\"")

or

system("say '#{my_variable}'")

Answer 2

Either remove the system or remove the backticks:

a = "hello"
#=> "hello"
`say '#{a}'`
#=> ""
system("say '#{a}'")
#=> true

Since you edited your post to be single quotes instead of backticks, single quotes cannot support string interpolation, see this question for more details.