diff --git a/Makefile b/Makefile
index fd9fcf4..4f19c76 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,14 @@
-.PHONY: pytest lint test
+.PHONY: pytest lint test tests package
 
-test: pytest lint
+tests: test
 
-pytest:
-		pytest -xvv
+test:
+		pytest
 
 lint:
+		pandoc --atx-headers --reference-links --reference-location=document --columns=79 -o README.md README.md
 		black --line-length 79 --quiet colligere/ tests/ scripts/
 		flake8 --max-line-length 79 colligere/ tests/ scripts/
-		pandoc --reference-links --reference-location=document --columns=79 -o README.md README.md
 
 package:
 		python3 -m pip install --upgrade build
diff --git a/README.md b/README.md
index 51220e9..e44abd1 100644
--- a/README.md
+++ b/README.md
@@ -1,95 +1,85 @@
 # 🔥 Book Metadata Tool ⚒️
 
-Herramienta para metadatos en [JSON Lines](https://jsonlines.org/)
+Herramienta para metadatos en [JSON Lines]
 
-Tool for metadata in [JSON Lines](https://jsonlines.org/)
+Tool for metadata in [JSON Lines]
 
 # Uso / Usage
 
 ## Analizer
 
-```
-$ python colligere/analizer.py metadata.jsonl
+    $ python colligere/analizer.py metadata.jsonl
 
-[0:00:00][0%][6i][57k] Fragmina verborum Titivillus colligit horum
-┌────────────────────────────────────────────────────────────┐
-│                        ▄▄▄▄▄▄▄▄▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀│
-│          ▗▞▀▀▀▀▀▀▀▀▀▀▀▀▘                                   │
-│         ▗▘                                                 │ 50k
-│        ▞▘                                                  │
-│      ▗▞                                                    │
-│     ▗▘                                                     │ 40k
-│    ▞▘                                                      │
-│  ▗▞                                                        │
-│ ▗▘                                                         │ 30k
-│▞▘                                                          │
-└────────────────────────────────────────────────────────────┘
-1i          2i          3i         4i          5i          6i
+    [0:00:00][0%][6i][57k] Fragmina verborum Titivillus colligit horum
+    ┌────────────────────────────────────────────────────────────┐
+    │                        ▄▄▄▄▄▄▄▄▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀│
+    │          ▗▞▀▀▀▀▀▀▀▀▀▀▀▀▘                                   │
+    │         ▗▘                                                 │ 50k
+    │        ▞▘                                                  │
+    │      ▗▞                                                    │
+    │     ▗▘                                                     │ 40k
+    │    ▞▘                                                      │
+    │  ▗▞                                                        │
+    │ ▗▘                                                         │ 30k
+    │▞▘                                                          │
+    └────────────────────────────────────────────────────────────┘
+    1i          2i          3i         4i          5i          6i
 
-$ python colligere/analizer.py -h
+    $ python colligere/analizer.py -h
 
-usage: Analizer [-h] [-i SAMPLE_LEN] [-k KEY] [-ky KEY] [-d DIR] [--debug] [-q] jsonl
+    usage: Analizer [-h] [-i SAMPLE_LEN] [-k KEY] [-ky KEY] [-d DIR] [--debug] [-q] jsonl
 
-Analize keys and values from JSON lines.
+    Analize keys and values from JSON lines.
 
-positional arguments:
-  jsonl                 JSON lines file
+    positional arguments:
+      jsonl                 JSON lines file
 
-options:
-  -h, --help            show this help message and exit
-  -i SAMPLE_LEN, --items SAMPLE_LEN
-                        random sample items size; 1000 by default
-  -k KEY, --key KEY     key value to analize
-  -ky KEY, --key-axis KEY
-                        like -k, but its values are used for y-axis
-  -d DIR, --directory DIR
-                        CSV output directory; CWD by default
-  --debug               stop on exception for debugging
-  -q, --quiet           avoid prints; ignored by --debug
+    options:
+      -h, --help            show this help message and exit
+      -i SAMPLE_LEN, --items SAMPLE_LEN
+                            random sample items size; 1000 by default
+      -k KEY, --key KEY     key value to analize
+      -ky KEY, --key-axis KEY
+                            like -k, but its values are used for y-axis
+      -d DIR, --directory DIR
+                            CSV output directory; CWD by default
+      --debug               stop on exception for debugging
+      -q, --quiet           avoid prints; ignored by --debug
 
-$ python colligere/analizer.py -k metadata.record.catalogingLanguage metadata.jsonl
+    $ python colligere/analizer.py -k metadata.record.catalogingLanguage metadata.jsonl
 
-⏳🍺💃🕺🎉⏳
+    ⏳🍺💃🕺🎉⏳
 
-$ cat res.metadata.record.catalogingLanguage.csv | head
-key,len,freq
-eng,664,0.35622
-und,99,0.05311
-fre,90,0.04828
-spa,65,0.03487
-ger,133,0.07135
-ara,10,0.00536
-zxx,23,0.01234
-heb,6,0.00322
-jpn,20,0.01073
-```
+    $ cat res.metadata.record.catalogingLanguage.csv | head
+    key,len,freq
+    eng,664,0.35622
+    und,99,0.05311
+    fre,90,0.04828
+    spa,65,0.03487
+    ger,133,0.07135
+    ara,10,0.00536
+    zxx,23,0.01234
+    heb,6,0.00322
+    jpn,20,0.01073
 
 # Desarrollo / Development
 
 Configuración inicial / Initial setup:
 
-```
-virtualenv .venv
-source .venv/bin/activate
-pip install -r requirements.txt
-```
+    virtualenv .venv
+    source .venv/bin/activate
+    pip install -r requirements.txt
 
 Pruebas / Tests:
 
-```
-make test
-```
+    make test
 
 Análisis y formateador / Lint:
 
-```
-make lint
-```
+    make lint
 
 Empaquetamiento / Packaging:
 
-```
-make package
-```
-
+    make package
 
+  [JSON Lines]: https://jsonlines.org/
diff --git a/colligere/analizer.py b/colligere/analizer.py
index a6d00ed..1ad48bf 100644
--- a/colligere/analizer.py
+++ b/colligere/analizer.py
@@ -148,63 +148,3 @@ class Analizer:
     def __elapsed_time(self):
         curr_time = timedelta(seconds=time.process_time() - self.start_time)
         return str(curr_time).split(".")[0]
-
-
-if __name__ == "__main__":
-
-    def get_args():
-        parser = argparse.ArgumentParser(
-            prog="Analizer",
-            description="Analize keys and values from JSON lines.",
-        )
-        parser.add_argument("jsonl", type=Path, help="JSON lines file")
-        parser.add_argument(
-            "-i",
-            "--items",
-            type=int,
-            default=1000,
-            dest="sample_len",
-            help="random sample items size; 1000 by default",
-        )
-        parser.add_argument(
-            "-k",
-            "--key",
-            default=[],
-            dest="keys",
-            action="append",
-            metavar="KEY",
-            help="key value to analize",
-        )
-        parser.add_argument(
-            "-ky",
-            "--key-axis",
-            default=None,
-            dest="ky",
-            metavar="KEY",
-            help="like -k, but its values are used for y-axis",
-        )
-        parser.add_argument(
-            "-d",
-            "--directory",
-            type=Path,
-            default=Path.cwd(),
-            dest="out_dir",
-            metavar="DIR",
-            help="CSV output directory; CWD by default",
-        )
-        parser.add_argument(
-            "--debug",
-            default=False,
-            action="store_true",
-            help="stop on exception for debugging",
-        )
-        parser.add_argument(
-            "-q",
-            "--quiet",
-            default=False,
-            action="store_true",
-            help="avoid prints; ignored by --debug",
-        )
-        return parser.parse_args()
-
-    Analizer(**vars(get_args()))
diff --git a/colligere/cli.py b/colligere/cli.py
index b85ec36..03c409c 100644
--- a/colligere/cli.py
+++ b/colligere/cli.py
@@ -1,2 +1,85 @@
+import argparse
+from pathlib import Path
+from colligere.analizer import Analizer
+
+
+def parse(args=None):
+    parser = argparse.ArgumentParser(
+        prog="colligere",
+        description="Tool for metadata in JSON Lines.",
+        epilog="Under GPLv3.",
+    )
+    parser.add_argument(
+        "-q",
+        "--quiet",
+        default=False,
+        action="store_true",
+        help="avoid prints; ignored by --debug",
+    )
+    parser.add_argument(
+        "--debug",
+        default=False,
+        action="store_true",
+        help="stop on exception for debugging",
+    )
+    subparsers = parser.add_subparsers(
+        required=True,
+        dest="subcmd",
+        title="subcommands",
+        help="Available tasks to perfom; run 'SUBCMD --help' for more info",
+    )
+    parse_analize(subparsers)
+    parser.add_argument("jsonl", type=Path, help="JSON lines file")
+    return parser.parse_args(args)
+
+
+def parse_analize(subparsers):
+    analizer = subparsers.add_parser(
+        "analize",
+        aliases=["a"],
+        description="Analize keys and values from JSON lines.",
+        help="analize keys and values",
+    )
+    analizer.add_argument(
+        "-i",
+        "--items",
+        type=int,
+        default=1000,
+        dest="sample_len",
+        help="random sample items size; 1000 by default",
+    )
+    analizer.add_argument(
+        "-k",
+        "--key",
+        default=[],
+        dest="keys",
+        action="append",
+        metavar="KEY",
+        help="key value to analize",
+    )
+    analizer.add_argument(
+        "-ky",
+        "--key-axis",
+        default=None,
+        dest="ky",
+        metavar="KEY",
+        help="like -k, but its values are used for y-axis",
+    )
+    analizer.add_argument(
+        "-d",
+        "--directory",
+        type=Path,
+        default=Path.cwd(),
+        dest="out_dir",
+        metavar="DIR",
+        help="CSV output directory; CWD by default",
+    )
+
+
 def main():
-    print("TODO")
+    args = vars(parse())
+    subcmd = args["subcmd"]
+    del args["subcmd"]
+    match subcmd:
+        case "analize":
+            Analizer(**args)
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..a793944
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,15 @@
+from colligere.cli import parse
+
+
+def assert_out(capsys, msg, *args):
+    try:
+        parse(args)
+    except SystemExit:
+        pass
+    stdout = capsys.readouterr().out
+    assert msg in stdout
+
+
+def test_helps(capsys):
+    for args in [["-h"], ["analize", "-h"]]:
+        assert_out(capsys, "usage:", *args)