eval
Syntax
EVAL <command(s)>Parameters
The commands to evaluate.
Description
Evaluates the given commands and executes them; you can use internal
variables and separate multiple commands by using the ; character.
If the command contains a string with $, \ or ; those characters
need to be escaped:
    `$' -> `$$'
    `\' -> `\\' (or even `\\\\', depending on where they are used)
    `;' -> `\;'
Examples
/EVAL echo I am connected to ${S} on ${chatnet} as ${N}
/EVAL echo My user privileges are +${usermode}; echo Let's party!
to print 1;2$3\4:
/EVAL echo 1\;2$$3\\4
References
https://github.com/irssi/irssi/blob/master/docs/special_vars.txt