在PATH环境变量中包含命令

Question

Is it possible to include a command inside the PATH, that's run whenever PATH is read?

Use case: I want to prepend the output of npm bin to my path so I have access to local npm package binaries without having to type $(npm bin)/grunt . If I cd to another node project, I'd want my path updated to point to the new output of npm bin .

Answer 1

Your best bet would be to update your path on every directory change. Something along these lines ought to do it:

 # define a "PRE_PATH"
 export PRE_PATH="/bin:/usr/bin" # <-- put your actual path here
 export PATH=$PRE_PATH

 function update_my_path() {
   local npm_path
   npm_path=`npm bin`
   if [[ -z $npm_path ]]; then
      PATH=${npm_path}:$PRE_PATH
      # do you need to rehash after redefining your $PATH? I don't know...
      rehash
   fi 
 }
 autoload -U add-zsh-hook
 add-zsh-hook chpwd update_my_path

an alternative would be to define a bunch of functions such as

 function grunt() { $(npm bin)/grunt $@ }