Why is echo showing the command itself and not the command output

Why is echo showing the command and not the output of the command once I start using it in a FOR I loop? For example this command works

root@linux1 tmp]# iscsiadm -m node |awk '{print $1}'
192.168.100.88:326

But not in a FOR I loop

[root@linux1 tmp]# for i in 'iscsiadm -m node | awk '{print $1}'';do echo $i;done
iscsiadm -m node | awk {print
}

I want the command to print the first field so then I can add other functionality to the For I loop. Thanks

EDIT — Not sure why I got voted down on this question. Please advise.

Answer

You’re not executing the iscsiadm and awk commands, because you quoted it; that makes it a literal string. To substitute the output of a command back into the command line, use $(...)

for i in $(iscsiadm -m node |awk '{print $1}'); do
    echo $i
done