晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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sh-3ll 1.0
DIR:/lib/node_modules/npm/node_modules/which/
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Current File : //lib/node_modules/npm/node_modules/which/which.js
module.exports = which
which.sync = whichSync

var isWindows = process.platform === 'win32' ||
    process.env.OSTYPE === 'cygwin' ||
    process.env.OSTYPE === 'msys'

var path = require('path')
var COLON = isWindows ? ';' : ':'
var isexe = require('isexe')

function getNotFoundError (cmd) {
  var er = new Error('not found: ' + cmd)
  er.code = 'ENOENT'

  return er
}

function getPathInfo (cmd, opt) {
  var colon = opt.colon || COLON
  var pathEnv = opt.path || process.env.PATH || ''
  var pathExt = ['']

  pathEnv = pathEnv.split(colon)

  var pathExtExe = ''
  if (isWindows) {
    pathEnv.unshift(process.cwd())
    pathExtExe = (opt.pathExt || process.env.PATHEXT || '.EXE;.CMD;.BAT;.COM')
    pathExt = pathExtExe.split(colon)


    // Always test the cmd itself first.  isexe will check to make sure
    // it's found in the pathExt set.
    if (cmd.indexOf('.') !== -1 && pathExt[0] !== '')
      pathExt.unshift('')
  }

  // If it has a slash, then we don't bother searching the pathenv.
  // just check the file itself, and that's it.
  if (cmd.match(/\//) || isWindows && cmd.match(/\\/))
    pathEnv = ['']

  return {
    env: pathEnv,
    ext: pathExt,
    extExe: pathExtExe
  }
}

function which (cmd, opt, cb) {
  if (typeof opt === 'function') {
    cb = opt
    opt = {}
  }

  var info = getPathInfo(cmd, opt)
  var pathEnv = info.env
  var pathExt = info.ext
  var pathExtExe = info.extExe
  var found = []

  ;(function F (i, l) {
    if (i === l) {
      if (opt.all && found.length)
        return cb(null, found)
      else
        return cb(getNotFoundError(cmd))
    }

    var pathPart = pathEnv[i]
    if (pathPart.charAt(0) === '"' && pathPart.slice(-1) === '"')
      pathPart = pathPart.slice(1, -1)

    var p = path.join(pathPart, cmd)
    if (!pathPart && (/^\.[\\\/]/).test(cmd)) {
      p = cmd.slice(0, 2) + p
    }
    ;(function E (ii, ll) {
      if (ii === ll) return F(i + 1, l)
      var ext = pathExt[ii]
      isexe(p + ext, { pathExt: pathExtExe }, function (er, is) {
        if (!er && is) {
          if (opt.all)
            found.push(p + ext)
          else
            return cb(null, p + ext)
        }
        return E(ii + 1, ll)
      })
    })(0, pathExt.length)
  })(0, pathEnv.length)
}

function whichSync (cmd, opt) {
  opt = opt || {}

  var info = getPathInfo(cmd, opt)
  var pathEnv = info.env
  var pathExt = info.ext
  var pathExtExe = info.extExe
  var found = []

  for (var i = 0, l = pathEnv.length; i < l; i ++) {
    var pathPart = pathEnv[i]
    if (pathPart.charAt(0) === '"' && pathPart.slice(-1) === '"')
      pathPart = pathPart.slice(1, -1)

    var p = path.join(pathPart, cmd)
    if (!pathPart && /^\.[\\\/]/.test(cmd)) {
      p = cmd.slice(0, 2) + p
    }
    for (var j = 0, ll = pathExt.length; j < ll; j ++) {
      var cur = p + pathExt[j]
      var is
      try {
        is = isexe.sync(cur, { pathExt: pathExtExe })
        if (is) {
          if (opt.all)
            found.push(cur)
          else
            return cur
        }
      } catch (ex) {}
    }
  }

  if (opt.all && found.length)
    return found

  if (opt.nothrow)
    return null

  throw getNotFoundError(cmd)
}