Hi all.
I'm trying to make simple check at start of my script and if check fail just interrupt script execution. I can't find a command to do this in manual. Exit, quit or something else? Can somebody help me with this?

Thats it if check fail your code will not be executed

Thank you mrz
But what I actually want to achieve is to make something like:
:if ( condition = true ) do={
< command wich brakes execution of script >
}

I just don't want to use multiple nested if but if it is the only way, I'll try.

as far as I know unfortunately nested ifs are the only way. There are no stop script command.

but there could be a workaround:

:if ( condition=true ) do={
/system script job remove [/system script job find script=<script_name>;
}
not sure if it will work but you can try.