evalutate $vim as argue of a command line

Hi,

I have wrote this little command in order to retrieve in Vim the out of a system call.

command! -nargs=+ OutSay :let g:out=system("".<q-args>) | enew | put=g:out


It works well but I need to pass $vim value as args of command in order to execute this :

OutSay 7z a Vim.7z $vim



But $vim is not evaluated. Same thing with expand( func

Have you got an idea ?

Thank you

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