How to get command output in NSIS?

I'm wondering, how do I get the output of an execwait command in NSIS. For example, if I run tree, how would I get the output, which would be the actual tree?

How do you compile NSIS?

nsi file by simply right-clicking on it in Explorer and selecting 'compile'. If you want to use MakeNSIS on the command line, the syntax of makensis is: makensis [ option | script.

What is a NSIS script?

1.1 About NSIS NSIS (Nullsoft Scriptable Install System) is a tool that allows programmers to create such installers for Windows. It is released under an open source license and is completely free for any use.

You can't do that with ExecWait, you have to use one of the plugins: nsExec, ExecDos or ExecCmd