Can I run conda in CLI?

How can I run “conda” in python interactor? I want to pip install some code.

You can run any executable in using Python as you would normally do. If you don’t use Slicer’s Python then it is probably better to use the original startup environment and not Slicer’s working environment. See details here: Subprocess call in Python interpreter results in memory corruption

I need to install vmtk(to use vmtkcenterlinesmoothing, etc)in 3d slicer through the python interactor. How do I do that, any help is appreciated. Thanks

You can get VMTK by installing SlicerVMTK extension.