问题
Ruby gem names are really throwing me off. For example if install a gem called jade, a wrapper script is placed at /usr/bin/jade1.9 on some systems and at /usr/bin/jade on others. I'm curious if anyone has a recommendation on how I can use jade in scripts without writing some hackish code that guesses the correct gem name. The naming also makes it difficult to write documentation for less savvy users. Is there a simple way of making gems install with same name on all systems?
To elaborate a bit:
gem install jade #jade is something I made up
ls /usr/bin/|grep "jade"
> jade1.9
When I want to execute:
jade --dosomething
I actually have to run
jade1.9 --dosomething
I've noticed certain gems such as rake are installed at both /usr/bin/rake and /usr/bin/rake1.9 with neither being a symlink and both files having the same md5sum.
I am trying to understand why gems get the ruby version appended on some systems and how I can make install without the trailing version number.
A list of some example of gems that install an executable:
ls /usr/bin/|grep "1.9"
amalgalite-pack1.9
bundle1.9
crate1.9
erb1.9
gem1.9
irb1.9
minitar1.9
rake1.9
rdoc1.9
ri1.9
rlock1.9
ruby1.9
rubyscript2exe1.9
testrb1.9
来源：https://stackoverflow.com/questions/19798660/ruby-gem-names-with-appended-ruby-version