If you want to set an env variable in bash for only 1 command, here’s some bad ways to do it:
Problem: What if FOO was already set?
Problem: Ok, now you revert FOO to its original value, but what a pain in the ass!
Well, that certainly works.
() creates a new environment by
calling fork() but that’s pretty heavyweight.
Yes, that sets FOO, exports it, and only sets it for the execution of one command. You can even set more variables.
This is the second least known feature of bash. I’ll write about what I think is the least know feature in my next blog post.