Is there any command line in Mercurial to show the repository tree

You can try this too:

$ hg serve

Both workable.

hg glog
hg view

Be sure to activate the needed extensions in your .hgrc file, otherwise hg view and hg glog will fail:

...

[extensions]
hgk =
graphlog =
...

Make sure that there is a blank line before [extensions].