diff --git a/mmcli.py b/mmcli.py
index d3c219f..9983c69 100755
--- a/mmcli.py
+++ b/mmcli.py
@@ -31,16 +31,13 @@ def yes_no(x):
 	return "yes" if x else "no"
 
 
-def get_posts_for_channel(self, channel_id: str, **kwargs) -> Generator[Dict, None, None]:
+def get_posts_for_channel(self, channel_id: str, progress=lambda x: None, **kwargs) -> Generator[Dict, None, None]:
 	"""
-	Generator: Get a page of posts in a channel. Use the query parameters to modify the behaviour of this endpoint.
-
-	@param channel_id: The channel ID to iterate over.
-
-	Raises:
-		ApiException: Passed on from lower layers.
+	@raises ApiException: Passed on from lower layers.
 	"""
 	page = 0
+	posts = []
+
 	while True:
 		data_page = self._get(f"/v4/channels/{channel_id}/posts", params={"page":str(page), "per_page":200, **kwargs})
 
@@ -48,11 +45,15 @@ def get_posts_for_channel(self, channel_id: str, **kwargs) -> Generator[Dict, No
 			break
 		page += 1
 
-		for order in data_page["order"]:
-			yield data_page["posts"][order]
-
+		posts.extend(data_page["posts"][order] for order in data_page["order"])
+		progress(len(posts))
 		sleep(0.1)
 
+	# Mattermost gives newest first, so reverse order
+	posts.reverse()
+
+	return posts
+
 
 
 ID_PREFIX = "id:"
@@ -105,15 +106,17 @@ def login(mm_api, parsed):
 		f"TOTP token provided: {yes_no(parsed.totp)}",
 		file=sys.stderr)
 	mm_api.login(parsed.user, parsed.password, parsed.totp)
-	return mm_api._bearer
+
+	if parsed.format == "json":
+		print(json.dumps({"token": mm_api._bearer}))
+	elif parsed.format == "tsv":
+		print(mm_api._bearer)
+	else:
+		assert False
 
 
 def cat(mm_api: mattermost.MMApi, parsed):
 
-
-	# FIXME Wrong order
-
-
 	channels = [
 		resolve_team_channel(mm_api, query)
 		for query in parsed.channels
@@ -135,9 +138,40 @@ def cat(mm_api: mattermost.MMApi, parsed):
 			def attribute(key_value):
 				return key_value
 
-		for post in get_posts_for_channel(mm_api, channel["id"], after=parsed.after):
+		posts = get_posts_for_channel(mm_api, channel["id"], after=parsed.after)
+		for post in posts:
 			print(post_str(attribute, post, parsed))
-	print(parsed.after)
+
+
+def send(mm_api: mattermost.MMApi, parsed):
+	read_stdin = parsed.message is None or parsed.channel is None
+
+	team, channel = resolve_team_channel(mm_api, parsed.channel) if parsed.channel is not None else (None, None)
+
+	if read_stdin:
+		if sys.stdin.isatty():
+			print("Reading from tty. (You can type the message objects below. Or maybe you meant to redirect something to stdin.)", file=sys.stderr)
+
+		for line in sys.stdin:
+			msg = json.loads(line)
+
+			if "channel_id" in msg:
+				channel_id = msg["channel_id"]
+			elif "channel" in msg:
+				_, local_channel = resolve_team_channel(mm_api, msg["channel"])
+				channel_id = local_channel["id"]
+			elif channel is not None:
+				channel_id = channel["id"]
+			else:
+				print(f"Illegal message, missing channel: {line.strip()}", file=sys.stderr)
+				raise ValueError("Illegal message, missing channel")
+
+			sent = mm_api.create_post(channel_id, msg["message"], props={"from_mmcli": "true"}, filepaths=msg.get("attachments", msg.get("attachments")))
+			print(sent)
+
+	else:
+		sent = mm_api.create_post(channel["id"], parsed.message, props={"from_mmcli": "true"}, filepaths=parsed.attach)
+		print(sent)
 
 
 def post_str(attribute, post, parsed):
@@ -152,14 +186,16 @@ def post_str(attribute, post, parsed):
 	if parsed.format == "tsv":
 		msg = obj.get("message", "").replace("\\", "\\\\").replace("\t", r"\t").replace("\n", r"\n")
 		return f"{obj['id']}\t{obj['create_at']}\t{obj.get('username') or obj['user_id']}\t{msg}"
+	assert False
 
 
 ACTIONS = {
 	"login": {"function": login, "accesstoken_required": False},
 	"cat": {"function": cat},
+	"send": {"function": send},
 }
 
-FORMATTERS = { "json", "tsv", "csv" }
+FORMATTERS = { "json", "tsv" }
 
 ENVVAR_SERVER = "MM_SERVER"
 ENVVAR_USERNAME = "MM_USERNAME"
@@ -200,13 +236,26 @@ Hint: JSON output can be filtered on the command line with jq(1).
 	parser_login.add_argument("--password", default=os.getenv(ENVVAR_PASSWORD))
 	parser_login.add_argument("--totp", default=os.getenv(ENVVAR_TOTP))
 
-	parser_cat = subparsers.add_parser("cat", help="list messages in channel(s)")
-	parser_cat.add_argument(
-		"channels", nargs="+", help="URL names of team and channel: '<team>/<channel>'")
+	# TODO support multiple channels
+	# parser_cat = subparsers.add_parser("cat", help="list messages in channel(s)")
+	# parser_cat.add_argument(
+		# "channels", nargs="+", help="URL names of team and channel: '<team>/<channel>'")
+	parser_cat = subparsers.add_parser("cat", help="list messages in channel")
+	parser_cat.add_argument("channel", help="URL names of team and channel: '<team>/<channel>'")
+	# ---
 	parser_cat.add_argument("--after", help="all after post with ID")
 	parser_cat.add_argument("--since", help="all after timestamp")
 	parser_cat.add_argument("-f", "--follow", help="keep running, printing new posts as they come in")
 
+	parser_send = subparsers.add_parser("send", help="send message(s)")
+	parser_send.add_argument(
+		"--channel", help="URL names of team and channel: '<team>/<channel>'; if not provided, "
+		"messages must be provided on stdin and each must specify channel")
+	parser_send.add_argument(
+		"--message", help="message; if not provided, messages will be expected on stdin")
+	parser_send.add_argument(
+		"--attach", nargs="+", help="filename of file to attach")
+
 	parsed = argparser.parse_args()
 
 	if not parsed.server: