export variable within `/bin/bash -c` [duplicate]

Question

I'm trying to export variable within the /bin/bash -c command.

This results in empty output:

/bin/bash -c "export FOO=foo; echo $FOO"

What would be the proper way to do that?

Answer 1

Since you double-quoted the command, the $FOO got evaluated in your current shell, not by the /bin/bash -c. That is, what actually got executed was this:

/bin/bash -c 'export FOO=foo; echo '

Enclose in single-quotes:

/bin/bash -c 'export FOO=foo; echo $FOO'

An equivalent shorter form:

FOO=foo /bin/bash -c 'echo $FOO'