I'm opening this issue because:

• npm is crashing.
• npm is producing an incorrect install.
• npm is doing something I don't understand.
• Other (see below for feature requests):

What's going wrong?

When attempting to run a script which contains npm explore to a path to a module, npm throws an error about not finding /bin/zsh or /bin/bash. In trying to narrow down the regression range, this seems to work correctly in v3.8.9 and fails at v3.9.0+.

$ npm test

> [email protected] test /Users/eli/code/npm-fail
> npm explore $(echo "$(cd "$(dirname "sub")" && pwd)/$(basename "sub")") -- 'npm install && npm test'

zsh:1: command not found: npm install && npm test
npm ERR! Darwin 15.5.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "explore" "/Users/eli/code/npm-fail/sub" "--" "npm install && npm test"
npm ERR! node v6.2.1
npm ERR! npm  v3.9.0
npm ERR! file /bin/zsh
npm ERR! code ENOENT
npm ERR! errno ENOENT
npm ERR! syscall spawn

npm ERR! enoent spawn ENOENT
npm ERR! enoent spawn ENOENT
npm ERR! enoent This is most likely not a problem with npm itself
npm ERR! enoent and is related to npm not being able to find a file.
npm ERR! enoent
npm ERR! enoent Check if the file '/bin/zsh' is present.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/eli/code/npm-fail/npm-debug.log
npm ERR! Test failed.  See above for more details.

I've created a reduced test case at https://github.com/eliperelman/npm-fail

supporting information:

• npm -v prints: 3.9.0
• node -v prints: v6.2.1
• npm config get registry prints: https://registry.npmjs.org/
• Windows, OS X, or Linux?: OS X
• Network issues:
  • Geographic location where npm was run:
  • I use a proxy to connect to the npm registry.
  • I use a proxy to connect to the web.
  • I use a proxy when downloading Git repos.
  • I access the npm registry via a VPN
  • I don't use a proxy, but have limited or unreliable internet access.
• Container:
  • I develop using Vagrant on Windows.
  • I develop using Vagrant on OS X or Linux.
  • I develop / deploy using Docker.
  • I deploy to a PaaS (Triton, Heroku).