diff --git a/subcmds/forall.py b/subcmds/forall.py
new file mode 100644
index 0000000..b22e22a
--- /dev/null
+++ b/subcmds/forall.py
@@ -0,0 +1,82 @@
+#
+# Copyright (C) 2008 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import re
+import os
+import sys
+import subprocess
+from command import Command
+
+class Forall(Command):
+  common = False
+  helpSummary = "Run a shell command in each project"
+  helpUsage = """
+%prog [<project>...] -c <command> [<arg>...]
+"""
+  helpDescription = """
+Executes the same shell command in each project.
+
+Environment
+-----------
+pwd is the project's working directory.
+
+REPO_PROJECT is set to the unique name of the project.
+
+shell positional arguments ($1, $2, .., $#) are set to any arguments
+following <command>.
+
+stdin, stdout, stderr are inherited from the terminal and are
+not redirected.
+"""
+
+  def _Options(self, p):
+    def cmd(option, opt_str, value, parser):
+      setattr(parser.values, option.dest, list(parser.rargs))
+      while parser.rargs:
+        del parser.rargs[0]
+    p.add_option('-c', '--command',
+                 help='Command (and arguments) to execute',
+                 dest='command',
+                 action='callback',
+                 callback=cmd)
+
+  def Execute(self, opt, args):
+    if not opt.command:
+      self.Usage()
+
+    cmd = [opt.command[0]]
+
+    shell = True
+    if re.compile(r'^[a-z0-9A-Z_/\.-]+$').match(cmd[0]):
+      shell = False
+
+    if shell:
+      cmd.append(cmd[0])
+    cmd.extend(opt.command[1:])
+
+    rc = 0
+    for project in self.GetProjects(args):
+      env = dict(os.environ.iteritems())
+      env['REPO_PROJECT'] = project.name
+
+      p = subprocess.Popen(cmd,
+                           cwd = project.worktree,
+                           shell = shell,
+                           env = env)
+      r = p.wait()
+      if r != 0 and r != rc:
+        rc = r
+    if rc != 0:
+      sys.exit(rc)