--- a/dockerfiles/ubuntu-xenial	Mon Oct 09 21:26:13 2017 +0800
+++ b/dockerfiles/ubuntu-xenial	Sun Oct 15 09:55:04 2017 +0800
@@ -14,6 +14,7 @@
     unzip \
     npm \
     virtualenv \
+    shellcheck \
  && rm -rf /var/lib/apt/lists/*
 
 RUN useradd worker --create-home --user-group

--- a/incoming.py	Mon Oct 09 21:26:13 2017 +0800
+++ b/incoming.py	Sun Oct 15 09:55:04 2017 +0800
@@ -58,6 +58,10 @@
             # jshint
             (r'.* \((E\d{3})\)$', 'error'),
             (r'.* \((W\d{3})\)$', 'warning'),
+
+            # shellcheck
+            (r'^(?:warning|note): .* \[(SC\d{4})\]$', 'warning'),
+            (r'^error: .* \[(SC\d{4})\]$', 'error'),
         )
 
         for regex, cls in patterns:

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/linters/shellcheck.yml	Sun Oct 15 09:55:04 2017 +0800
@@ -0,0 +1,3 @@
+exec: ['shellcheck']
+flags: ['--format', 'gcc']
+version: ['--version']

--- a/tests/test_incoming.py	Mon Oct 09 21:26:13 2017 +0800
+++ b/tests/test_incoming.py	Sun Oct 15 09:55:04 2017 +0800
@@ -53,6 +53,18 @@
     assert extra['link_start'] == 0
     assert extra['link_end'] == 17
 
+    # shellcheck
+    errors, warnings, extra = mlo('helper.sh:121:5: note: hello. [SC1234]')
+    assert errors == 0
+    assert warnings == 1
+    assert set(extra) == usual_keys | {'code'}
+    assert extra['cls'] == 'warning'
+    assert extra['code'] == 'SC1234'
+    assert extra['filename'] == 'helper.sh'
+    assert extra['line_number'] == 121
+    assert extra['link_start'] == 0
+    assert extra['link_end'] == 13
+
     # generic
     errors, warnings, extra = mlo('requirements.txt:5:1: PIL is obsolete.')
     assert errors == 0