我不知道这是***的方法(与sed，AWK或Perl相比)，但是使用python的方法可以轻松地完成您要的操作json库.

I don't know if this is the best approach (vs sed, AWK, or Perl) but it is straightforward to do what you're asking using python's json library.

import json

# read the file as a dict using json.loads
d = json.loads(open('servername.json', 'r').read())

# add your new role to the end of the run_list
d['run_list'].append('role[My_New_Role]')

# write new json to file (specify a new file, or overwrite if you prefer)
open('new_servername.json', 'w').write(json.dumps(d, indent=2))

输出文件如下:

{
  "chef_environment": "test", 
  "name": "myserver123", 
  "run_list": [ 
    "role[base-pkg]", 
    "role[interesting_stuff]", 
    "role[user_apps]",
    "role[My_New_Role]"
  ]
}

很容易将这段代码修改为一个脚本，并以文件名作为输入，这样很容易多次运行.

It's pretty easy to modify this code into a script with the filename as an input so that it's easy to run multiple times.