Syntax: @evaluate Evaluates . The syntax of is generally: Or ... This is a complex command to document as it is so powerful, and so easy to abuse, leading to potential security risks, as values can be the result of commands or the contents of variables as well as the result of operations. The most common mistake is to try to delimit variable values in double quotes to ensure that spaces are included, forgetting that the variables could also include double quotes themselves, or even worse include curly braces that @eval could then parse as command-expansion.