eva:tldr:cb501
The given command eva "${(1 + 2) * 2 ^ 2}"
seems to be written in a scripting language called zsh
. This command uses parameter expansion in zsh
to evaluate an expression and substitute the result into the command.
Here is a breakdown of the command:

eva
: This appears to be a custom function or script that evaluates and executes the expression provided as an argument. 
"${(1 + 2) * 2 ^ 2}"
: Inside double quotes, the entire expression is enclosed. Within the expression, there are multiple subexpressions that will be evaluated separately:
(1 + 2)
: This subexpression adds 1 and 2, resulting in 3. 
2 ^ 2
: This subexpression raises 2 to the power of 2, resulting in 4. 
(1 + 2) * 2 ^ 2
: This subexpression multiplies the result of the previous subexpressions (3 and 4), resulting in 12.

Therefore, when executing the eva
command with the expression provided in double quotes, it will evaluate the expression 12
and most likely perform some action based on the result (which would depend on the specific implementation of the eva
function or script).