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I have seen something like this in my bash ENV:

module=() { eval `/usr/bin/modulecmd bash $*` } 

How does this construct work? What is it called?

I'm not asking about modulecmd, I am asking about the entire construct.

WARNING - this question is about the Bash before the shellshock vulnerability, due to which it was changed.

I have seen something like this in my bash ENV:

module=() { eval `/usr/bin/modulecmd bash $*` } 

How does this construct work? What is it called?

I'm not asking about modulecmd, I am asking about the entire construct.

I have seen something like this in my bash ENV:

module=() { eval /usr/bin/modulecmd bash $* }

How does this construct work? What is it called?

I'm not asking about modulecmd, I am asking about the entire construct.

I have seen something like this in my bash ENV:

module=() { eval `/usr/bin/modulecmd bash $*` } 

How does this construct work? What is it called?

I'm not asking about modulecmd, I am asking about the entire construct.