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Specifically, I'm trying to install NERDtree. I downloaded the 4.10 package from github, unzipped it into ~/.vim/, and restarted MacVim (version 7.3).

Typing :nerdtree results in the following error:

E492: Not an editor command: nerdtree

In terminal, typing:

cd ~/.vim
ls -R

Results in:

Rakefile    doc     nerdtree_plugin plugin


exec_menuitem.vim   fs_menu.vim


What am I missing?

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up vote 5 down vote accepted

The command is :NERDTree—case does matter, especially since only internal Vim commands can start with a lowercase letter.

If you followed the installation instructions you should be able to do ":help NERD_Tree.txt". If not, do ":helptags ~/.vim/doc".

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This was it. Thank you! I had also tried NERDtree, but I never tried it with a capital T. :\ – Closure Cowboy Feb 22 '11 at 1:02
@Closure Cowboy: that's still a lot to type. Typing ":NE" then hitting tab does the job for me, because vim has auto-completion in the command line. – vtest Feb 24 '11 at 16:11

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