error: could not find or load main class Hello.class - compilation

Question

Trying simplest kotlin hello world possible:
thufir#dur:~/kotlin$
thufir#dur:~/kotlin$ ll
total 32
drwxr-xr-x 2 thufir thufir 4096 Oct 27 07:28 ./
drwx------ 46 thufir thufir 16384 Oct 27 06:47 ../
-rw-r--r-- 1 thufir thufir 104 Oct 27 07:27 Hello.kt
thufir#dur:~/kotlin$
thufir#dur:~/kotlin$ kotlinc Hello.kt
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.intellij.util.text.StringFactory to constructor java.lang.String(char[],boolean)
WARNING: Please consider reporting this to the maintainers of com.intellij.util.text.StringFactory
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
thufir#dur:~/kotlin$
thufir#dur:~/kotlin$ kotlin Hello.class
error: could not find or load main class Hello.class
thufir#dur:~/kotlin$
thufir#dur:~/kotlin$ cat Hello.kt
class Hello {
fun main(args: Array<String>) {
println("Hello, world!" + args[0])
}
}
thufir#dur:~/kotlin$
thufir#dur:~/kotlin$ kotlinc -version
info: kotlinc-jvm 1.1.51 (JRE 9.0.0.15+181)
thufir#dur:~/kotlin$
How do I run that from the CLI?
desired output:
thufir#dur:~/kotlin$
thufir#dur:~/kotlin$ kotlinc
Welcome to Kotlin version 1.1.51 (JRE 9.0.0.15+181)
Type :help for help, :quit for quit
>>>
>>> println("hello world");
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.intellij.util.text.StringFactory to constructor java.lang.String(char[],boolean)
WARNING: Please consider reporting this to the maintainers of com.intellij.util.text.StringFactory
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
hello world
>>>
>>> :quit
thufir#dur:~/kotlin$

Answer 1

First of all, that Hello may not work as you expect, because it's main function is not static. In Kotlin, you don't need a class to define a main method. Just use functions:
fun main(args: Array<String>) {
println("Hello, world!" + args[0])
}
Then, after compiling, you should not call it like kotlin <File>.class, but just kotlin <File>, the .class suffix is redundant:
$ ./compiler/kotlinc/bin/kotlin HelloKt test
Hello, world!test