diff --git a/server/package.json b/server/package.json
index 88ed86ae5..dfaddfee5 100644
--- a/server/package.json
+++ b/server/package.json
@@ -17,7 +17,7 @@
     "node": "*"
   },
   "dependencies": {
-    "glob": "^7.1.2",
+    "glob": "^7.1.3",
     "request": "^2.83.0",
     "request-promise-native": "^1.0.5",
     "tree-sitter": "^0.13.22",
@@ -30,5 +30,8 @@
     "compile": "rm -rf out && ../node_modules/.bin/tsc -p ./",
     "compile:watch": "../node_modules/.bin/tsc -w -p ./",
     "prepublishOnly": "yarn run compile"
+  },
+  "devDependencies": {
+    "@types/glob": "^7.1.1"
   }
 }
diff --git a/server/src/analyser.ts b/server/src/analyser.ts
index 70ff69a71..e6961e887 100644
--- a/server/src/analyser.ts
+++ b/server/src/analyser.ts
@@ -1,7 +1,6 @@
 // tslint:disable:no-submodule-imports
 import * as fs from 'fs'
 import * as glob from 'glob'
-import * as Path from 'path'
 
 import * as request from 'request-promise-native'
 import * as Parser from 'tree-sitter'
@@ -12,6 +11,8 @@ import * as LSP from 'vscode-languageserver'
 import { uniqueBasedOnHash } from './util/array'
 import { flattenArray, flattenObjectValues } from './util/flatten'
 import * as TreeSitterUtil from './util/tree-sitter'
+import { hasBashShebang } from './util/shebang';
+import { getGlobPattern } from './config';
 
 type Kinds = { [type: string]: LSP.SymbolKind }
 
@@ -33,41 +34,55 @@ export default class Analyzer {
    * If the rootPath is provided it will initialize all *.sh files it can find
    * anywhere on that path.
    */
-  public static fromRoot(
+  public static async fromRoot(
     connection: LSP.Connection,
     rootPath: string | null,
   ): Promise<Analyzer> {
-    // This happens if the users opens a single bash script without having the
-    // 'window' associated with a specific project.
-    if (!rootPath) {
-      return Promise.resolve(new Analyzer())
+    const analyzer = new Analyzer()
+
+    if (rootPath) {
+      const lookupStartTime = Date.now()
+
+      const globPattern = getGlobPattern()
+      connection.console.log(`Looking up files matching "${globPattern}"`)
+
+      const filePaths = await this.getFilePaths({globPattern, rootPath})
+
+      filePaths.forEach(filePath => {
+        const fileContent = fs.readFileSync(filePath, 'utf8')
+        if (!hasBashShebang(fileContent)) {
+          connection.console.log(`No bash shebang found for ${filePath}`)
+          return
+        }
+
+        connection.console.log(`Analyzing ${filePath}`)
+
+        const uri = 'file://' + filePath
+        analyzer.analyze(
+          uri,
+          LSP.TextDocument.create(
+            uri,
+            'shell',
+            1,
+            fileContent,
+          ),
+        )
+      })
+
+      connection.console.log(`Analyzing finished after ${(Date.now() - lookupStartTime)/1000} seconds`)
     }
 
+    return analyzer
+  }
+
+  private static getFilePaths({globPattern, rootPath}:{ globPattern: string, rootPath: string}): Promise<string[]> {
     return new Promise((resolve, reject) => {
-      glob('**/*.sh', { cwd: rootPath }, (err, paths) => {
-        if (err != null) {
-          reject(err)
-        } else {
-          const analyzer = new Analyzer()
-          paths.forEach(p => {
-            const absolute = Path.join(rootPath, p)
-            // only analyze files, glob pattern may match directories
-            if (fs.existsSync(absolute) && fs.lstatSync(absolute).isFile()) {
-              const uri = 'file://' + absolute
-              connection.console.log('Analyzing ' + uri)
-              analyzer.analyze(
-                uri,
-                LSP.TextDocument.create(
-                  uri,
-                  'shell',
-                  1,
-                  fs.readFileSync(absolute, 'utf8'),
-                ),
-              )
-            }
-          })
-          resolve(analyzer)
+      glob(globPattern, { cwd: rootPath, nodir: true, absolute: true }, function (err, files) {
+        if (err) {
+          return reject(err)
         }
+
+        resolve(files)
       })
     })
   }
diff --git a/server/src/config.ts b/server/src/config.ts
index 719553a51..e9f427b55 100644
--- a/server/src/config.ts
+++ b/server/src/config.ts
@@ -3,6 +3,11 @@ export function getExplainshellEndpoint(): string | null {
   return typeof EXPLAINSHELL_ENDPOINT !== 'undefined' ? EXPLAINSHELL_ENDPOINT : null
 }
 
+export function getGlobPattern(): string {
+  const { GLOB_PATTERN } = process.env
+  return typeof GLOB_PATTERN === 'string' ? GLOB_PATTERN : '**/*@(.sh|.inc|.bash|.command)'
+}
+
 export function getHighlightParsingError(): boolean {
   const { HIGHLIGHT_PARSING_ERRORS } = process.env
   return typeof HIGHLIGHT_PARSING_ERRORS !== 'undefined'
diff --git a/server/src/util/__tests__/shebang.test.ts b/server/src/util/__tests__/shebang.test.ts
new file mode 100644
index 000000000..8c1e021bd
--- /dev/null
+++ b/server/src/util/__tests__/shebang.test.ts
@@ -0,0 +1,31 @@
+import {hasBashShebang} from '../shebang'
+
+describe('hasBashShebang', () => {
+  it('returns false for empty file', () => {
+    expect(hasBashShebang('')).toBe(false)
+  })
+
+  it('returns false for python files', () => {
+    expect(hasBashShebang(`#!/usr/bin/env python2.7\n# set -x`)).toBe(false)
+  })
+
+  it('returns true for "#!/bin/sh -"', () => {
+    expect(hasBashShebang('#!/bin/sh -')).toBe(true)
+    expect(hasBashShebang('#!/bin/sh - ')).toBe(true)
+  })
+
+  it('returns true for "#!/usr/bin/env bash"', () => {
+    expect(hasBashShebang('#!/usr/bin/env bash')).toBe(true)
+    expect(hasBashShebang('#!/usr/bin/env bash ')).toBe(true)
+  })
+
+  it('returns true for "#!/bin/sh"', () => {
+    expect(hasBashShebang('#!/bin/sh')).toBe(true)
+    expect(hasBashShebang('#!/bin/sh ')).toBe(true)
+  })
+
+  it('returns true for "#!/bin/bash"', () => {
+    expect(hasBashShebang('#!/bin/bash')).toBe(true)
+    expect(hasBashShebang('#!/bin/bash ')).toBe(true)
+  })
+})
diff --git a/server/src/util/shebang.ts b/server/src/util/shebang.ts
new file mode 100644
index 000000000..cb6479cac
--- /dev/null
+++ b/server/src/util/shebang.ts
@@ -0,0 +1,11 @@
+const SHEBANG_REGEXP = /^#!(.*)/
+
+export function hasBashShebang(fileContent: string) {
+  const match = SHEBANG_REGEXP.exec(fileContent)
+  if (!match || !match[1]) {
+    return false
+  }
+
+  const shebang = match[1].replace('-', '').trim()
+  return shebang.endsWith('bash') || shebang.endsWith('sh')
+}
diff --git a/server/yarn.lock b/server/yarn.lock
index b89feae71..437d7febc 100644
--- a/server/yarn.lock
+++ b/server/yarn.lock
@@ -2,6 +2,30 @@
 # yarn lockfile v1
 
 
+"@types/events@*":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@types/events/-/events-3.0.0.tgz#2862f3f58a9a7f7c3e78d79f130dd4d71c25c2a7"
+  integrity sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==
+
+"@types/glob@^7.1.1":
+  version "7.1.1"
+  resolved "https://registry.yarnpkg.com/@types/glob/-/glob-7.1.1.tgz#aa59a1c6e3fbc421e07ccd31a944c30eba521575"
+  integrity sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==
+  dependencies:
+    "@types/events" "*"
+    "@types/minimatch" "*"
+    "@types/node" "*"
+
+"@types/minimatch@*":
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"
+  integrity sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==
+
+"@types/node@*":
+  version "11.11.6"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-11.11.6.tgz#df929d1bb2eee5afdda598a41930fe50b43eaa6a"
+  integrity sha512-Exw4yUWMBXM3X+8oqzJNRqZSwUAaS4+7NdvHqQuFi/d+synz++xmX3QIf+BFqneW8N31R8Ky+sikfZUXq07ggQ==
+
 abab@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/abab/-/abab-1.0.4.tgz#5faad9c2c07f60dd76770f71cf025b62a63cfd4e"
@@ -373,10 +397,10 @@ github-from-package@0.0.0:
   resolved "https://registry.yarnpkg.com/github-from-package/-/github-from-package-0.0.0.tgz#97fb5d96bfde8973313f20e8288ef9a167fa64ce"
   integrity sha1-l/tdlr/eiXMxPyDoKI75oWf6ZM4=
 
-glob@^7.1.2:
-  version "7.1.2"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
-  integrity sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==
+glob@^7.1.3:
+  version "7.1.3"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.3.tgz#3960832d3f1574108342dafd3a67b332c0969df1"
+  integrity sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==
   dependencies:
     fs.realpath "^1.0.0"
     inflight "^1.0.4"
diff --git a/testing/fixtures/include.inc b/testing/fixtures/include.inc
new file mode 100644
index 000000000..e8f9172e3
--- /dev/null
+++ b/testing/fixtures/include.inc
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+export XXX='my export'
+
diff --git a/testing/fixtures/included.sh b/testing/fixtures/included.sh
new file mode 100644
index 000000000..aa745d9ad
--- /dev/null
+++ b/testing/fixtures/included.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+. $(dirname "$0")/include.inc
+
+echo ${XXX}
+
diff --git a/testing/fixtures/no-extension b/testing/fixtures/no-extension
new file mode 100644
index 000000000..b39c374af
--- /dev/null
+++ b/testing/fixtures/no-extension
@@ -0,0 +1,8 @@
+#!/bin/bash
+configures="`env | grep 'npm_config_' | sed -e 's|^npm_config_||g'`"
+
+ret=$?
+if [ $ret -ne 0 ]; the
+  echo "It failed" >&2
+fi
+exit $ret
diff --git a/testing/fixtures/not-shell.sh b/testing/fixtures/not-shell.sh
new file mode 100644
index 000000000..d76b97283
--- /dev/null
+++ b/testing/fixtures/not-shell.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env python2.7
+# set -x
+
+def func():
+  print 'hello world'