creationix/nvm — pull request #181 by andrwj (2012-12-08 20:33:15+00:00)
Title: fixed 'bash command not found sha1sum' in Mac OS

line 188, `which shasum > /dev/null 2>&1` will be replaced by:

'/usr/bin/shasum > /dev/null 2>&1'

but, `/usr/bin/shasum` needs filename argument which is ommited and the
test results always 'false'.