npm install, but can't run

I'm a newbie to Node, but I've been trying to install some npm modules and after what seems like a successful install, I can't run the new app. I must have some basic config error, like a missing location in my PATH...

For example, running:

npm install -g karma

I get:

npm http GET https://registry.npmjs.org/karma
npm http 304 https://registry.npmjs.org/karma
npm http GET https://registry.npmjs.org/glob
... (many, many GETs......)

> [email protected] install /usr/local/share/npm/lib/node_modules/karma/node_modules/socket.io/node_modules/socket.io-client/node_modules/ws
> (node-gyp rebuild 2> builderror.log) || (exit 0)

  CXX(target) Release/obj.target/bufferutil/src/bufferutil.o
  SOLINK_MODULE(target) Release/bufferutil.node
  SOLINK_MODULE(target) Release/bufferutil.node: Finished
  CXX(target) Release/obj.target/validation/src/validation.o
  SOLINK_MODULE(target) Release/validation.node
  SOLINK_MODULE(target) Release/validation.node: Finished
/usr/local/share/npm/bin/karma -> /usr/local/share/npm/lib/node_modules/karma/bin/karma

> [email protected] install /usr/local/share/npm/lib/node_modules/karma
> node install-log4js.js

npm http GET https://registry.npmjs.org/log4js/0.6.2
npm http 304 https://registry.npmjs.org/log4js/0.6.2
npm http GET https://registry.npmjs.org/async/0.1.15
npm http GET https://registry.npmjs.org/dequeue/1.0.3
npm http 304 https://registry.npmjs.org/dequeue/1.0.3
npm http 304 https://registry.npmjs.org/async/0.1.15
[email protected] /usr/local/share/npm/lib/node_modules/log4js
├── [email protected]
└── [email protected]
[email protected] /usr/local/share/npm/lib/node_modules/karma
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected])
└── [email protected] ([email protected], [email protected], [email protected], [email protected])

But when I then try to run:

➤ karma start
fish: Unknown command 'karma'

Of course, if I run it by directly addressing the entire path to karma, it works fine:

/usr/local/share/npm/lib/node_modules/karma/bin/karma start

 Starting Testacular Server (http://vojtajina.github.com/testacular)
-------------------------------------------------------------------
INFO [karma]: Karma server started at http://localhost:9876/
INFO [launcher]: Starting browser Chrome
INFO [Chrome 26.0 (Mac)]: Connected on socket id sNhp2l8FW6zQ0iQsiRgR
Chrome 26.0 (Mac): Executed 1 of 1 SUCCESS (0.108 secs / 0.004 secs)

When I npm install something, isn't a symlink created somewhere?

➤ which npm
/usr/local/bin/npm

➤ npm --version
1.2.14

I did it by adding /usr/local/share/npm/bin to my path. (via editing my .bashrc file)

export PATH=/usr/local/bin:/usr/local/lib:/opt/local/bin:/opt/local/sbin:/usr/local/share/npm/bin:$PATH

npm install, but can't run

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