diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8de7f57
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,140 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit trajectory_files / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# User specific settings
+.idea/
+pinn_env
+pinn.egg-info
+old
+dev_tmp
+test/
+*.pre
+*.pinn
+.vscode
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..205dcf3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,17 @@
+# pyplot-cli
+
+Lightweight cli tool for plotting data. Currently, only line plot is supported.
+
+## Release note
+
+- `0.1.0` (2021.08.15): Initialized!
+
+## Usage
+
+- Basic: `pyplt [filename] -x [x_index] -y [y_indices]`
+  - The form `-y`: index1,index2,...
+- result:
+
+    ![example](examples/example.png)
+
+- more options: `--xlabel`, `--ylabel`, ... see `pyplt --help` for all options.
diff --git a/examples/data.dat b/examples/data.dat
new file mode 100644
index 0000000..94282cd
--- /dev/null
+++ b/examples/data.dat
@@ -0,0 +1,101 @@
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diff --git a/examples/example.png b/examples/example.png
new file mode 100644
index 0000000..a3b4d90
Binary files /dev/null and b/examples/example.png differ
diff --git a/examples/mystyle.mplstyle b/examples/mystyle.mplstyle
new file mode 100644
index 0000000..5749f2b
--- /dev/null
+++ b/examples/mystyle.mplstyle
@@ -0,0 +1,55 @@
+# Stylesheet for article figure.
+
+# Figure size
+figure.figsize : 4.95, 3.75  # (3.3 x 2.5) is for single column.
+
+# Font sizes
+axes.titlesize: 15
+axes.labelsize: 15
+xtick.labelsize: 12
+ytick.labelsize: 12
+legend.fontsize: 12.75
+font.size: 12
+
+# Tick style
+xtick.direction: in
+xtick.major.width: 1.4245
+xtick.major.size: 4.125
+xtick.minor.width: 1.4245
+xtick.minor.size: 2.4
+
+ytick.direction: in
+ytick.major.width: 1.4245
+ytick.major.size: 4.125
+ytick.minor.width: 1.4245
+ytick.minor.size: 2.4
+
+# legend
+legend.fancybox: False
+legend.edgecolor: none
+
+# Font Family
+font.family: Arial
+font.sans-serif: Arial, Helvetica, Lucida Grande, Verdana, Geneva, Lucid, Avant Garde, DejaVu Sans, sans-serif
+mathtext.rm: Arial
+
+# Set line widths
+axes.linewidth : 1.4245
+grid.linewidth : 0.6
+lines.linewidth : 1.2
+lines.markersize: 5.1
+
+# Always save as 'tight'
+savefig.dpi: 600
+savefig.bbox : tight
+savefig.pad_inches : 0.075  # Use virtually all space when we specify figure dimensions
+
+# LaTeX packages
+text.latex.preamble : \usepackage{amsmath} \usepackage{amssymb} \usepackage{sfmath}
+
+# others
+figure.facecolor: white
+figure.subplot.wspace: 0.375
+figure.subplot.hspace: 0.375
+
+axes.labelpad: 6.0
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..b0a9059
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,536 @@
+[[package]]
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+
+[package.extras]
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+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
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+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
+
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+
+[[package]]
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+
+[package.dependencies]
+six = "*"
+
+[[package]]
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+description = "An implementation of lxml.xmlfile for the standard library"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "flake8"
+version = "3.9.2"
+description = "the modular source code checker: pep8 pyflakes and co"
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+optional = false
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+
+[[package]]
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+category = "main"
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+
+[[package]]
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+
+[[package]]
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+
+[[package]]
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+
+[[package]]
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+optional = false
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+
+[[package]]
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+
+[package.dependencies]
+et-xmlfile = "*"
+
+[[package]]
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+version = "21.0"
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+
+[package.dependencies]
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+
+[package.dependencies]
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+pytz = ">=2017.3"
+
+[package.extras]
+test = ["hypothesis (>=3.58)", "pytest (>=6.0)", "pytest-xdist"]
+
+[[package]]
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+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.extras]
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+    {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},
+]
+pytz = [
+    {file = "pytz-2021.1-py2.py3-none-any.whl", hash = "sha256:eb10ce3e7736052ed3623d49975ce333bcd712c7bb19a58b9e2089d4057d0798"},
+    {file = "pytz-2021.1.tar.gz", hash = "sha256:83a4a90894bf38e243cf052c8b58f381bfe9a7a483f6a9cab140bc7f702ac4da"},
+]
+six = [
+    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
+typer = [
+    {file = "typer-0.3.2-py3-none-any.whl", hash = "sha256:ba58b920ce851b12a2d790143009fa00ac1d05b3ff3257061ff69dbdfc3d161b"},
+    {file = "typer-0.3.2.tar.gz", hash = "sha256:5455d750122cff96745b0dec87368f56d023725a7ebc9d2e54dd23dc86816303"},
+]
+wcwidth = [
+    {file = "wcwidth-0.2.5-py2.py3-none-any.whl", hash = "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784"},
+    {file = "wcwidth-0.2.5.tar.gz", hash = "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"},
+]
+yapf = [
+    {file = "yapf-0.31.0-py2.py3-none-any.whl", hash = "sha256:e3a234ba8455fe201eaa649cdac872d590089a18b661e39bbac7020978dd9c2e"},
+    {file = "yapf-0.31.0.tar.gz", hash = "sha256:408fb9a2b254c302f49db83c59f9aa0b4b0fd0ec25be3a5c51181327922ff63d"},
+]
diff --git a/pyplot_cli/__init__.py b/pyplot_cli/__init__.py
new file mode 100644
index 0000000..b794fd4
--- /dev/null
+++ b/pyplot_cli/__init__.py
@@ -0,0 +1 @@
+__version__ = '0.1.0'
diff --git a/pyplot_cli/cli.py b/pyplot_cli/cli.py
new file mode 100644
index 0000000..9528761
--- /dev/null
+++ b/pyplot_cli/cli.py
@@ -0,0 +1,101 @@
+import matplotlib.pyplot as plt
+import typer
+
+from pyplot_cli.io import DataSet
+
+
+def str_to_list(string: str, dtype: type) -> list:
+    """convert comma-separarted options to list.
+    """
+    if string == "":
+        return []
+    string = "".join(string.split())  # remove whitespaces
+    options = list(map(dtype, string.split(",")))
+    return options
+
+
+def main(
+    filename: str,
+    x_idx: int = typer.Option(..., "-x"),
+    y_idx_list: str = typer.Option(
+        ..., "-y", help="Comma-separated column indices like '1,2'"),
+    colors: str = typer.Option("", help="Comma-separated colors like 'k,r'"),
+    styles: str = typer.Option("-", help="Comma-separated colors like '-,o-'"),
+    xlabel: str = typer.Option(
+        "", help="xlabel. Default is column name of selected x."),
+    ylabel: str = typer.Option("", help="ylabel. default is 'data'"),
+    show_grid: bool = typer.Option(False, "--grid", help="Show grids or not"),
+    show_minorticks: bool = typer.Option(False,
+                                         "--minorticks",
+                                         help="Show minorticks or not"),
+    show_legend: bool = typer.Option(False,
+                                     "--legend",
+                                     help="Show legend or not"),
+    show_figure: bool = typer.Option(True,
+                                     "--show",
+                                     help="Show interactive figure or not"),
+    stylesheet: str = typer.Option(
+        "", help="Custom stylesheet. If not given, uses default style."),
+    save_file: str = typer.Option(
+        "",
+        "--output",
+        help="Filename to save figure. If not given, does not save."),
+):
+    """Simple cli app to plot figure from data file with matplotlib."""
+    y_idx_list = str_to_list(y_idx_list, int)
+    colors = str_to_list(colors, str)
+    styles = str_to_list(styles, str)
+
+    if len(styles) == 1:
+        styles = styles * len(y_idx_list)
+
+    dataset = DataSet(filename)
+
+    x_values = dataset.values[x_idx]
+    selected_column_names = [dataset.column_names[i] for i in y_idx_list]
+    y_values_list = [dataset.values[i] for i in y_idx_list]
+
+    if stylesheet:
+        plt.style.use(stylesheet)
+
+    plt.figure()
+
+    # plot
+    if colors == []:
+        for style, label, y_values in zip(styles, selected_column_names,
+                                          y_values_list):
+            plt.plot(x_values, y_values, style, label=label)
+    else:
+        for style, color, label, y_values in zip(styles, colors,
+                                                 selected_column_names,
+                                                 y_values_list):
+            plt.plot(x_values, y_values, style, c=color, label=label)
+
+    if xlabel:
+        plt.xlabel(xlabel)
+    else:
+        plt.xlabel(dataset.column_names[0])
+
+    if ylabel:
+        plt.ylabel(ylabel)
+    else:
+        plt.ylabel("data")
+
+    if show_grid:
+        plt.grid()
+
+    if show_minorticks:
+        plt.minorticks_on()
+
+    if show_legend:
+        plt.legend(facecolor="none", edgecolor="none")
+
+    if save_file:
+        plt.savefig(save_file, dpi=600, facecolor="w")
+
+    if show_figure:
+        plt.show()
+
+
+def run():
+    typer.run(main)
diff --git a/pyplot_cli/io.py b/pyplot_cli/io.py
new file mode 100644
index 0000000..9335187
--- /dev/null
+++ b/pyplot_cli/io.py
@@ -0,0 +1,32 @@
+import pandas as pd
+
+
+class DataSet:
+    _available_types = ["dat", "txt", "csv", "xls", "xlsx"]
+
+    def __init__(self, filename: str):
+        self.filename: str = filename
+        self.extension: str = filename.split(".")[-1]
+
+        if self.extension not in self._available_types:
+            raise ValueError("Invalid file extension.")
+
+        if self.extension == "xls" or self.extension == "xlsx":
+            self.dataframe = self.load_excel()
+        else:
+            self.dataframe = self.load_txt()
+
+        self.column_names = list(self.dataframe.keys())
+        self.values = self.dataframe.values.T
+
+    def load_excel(self):
+        return self.load_excel(self.filename)
+
+    def load_txt(self):
+        if self.extension == "csv":
+            sep = ","
+        elif self.extension == "dat" or self.extension == "txt":
+            sep = r"\s+"
+
+        data = pd.read_csv(self.filename, sep=sep)
+        return data
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..00d5167
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,24 @@
+[tool.poetry]
+name = "pyplot-cli"
+version = "0.1.0"
+description = ""
+authors = ["Minjoon Hong <mjhong0708@yonsei.ac.kr>"]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+matplotlib = "^3.4.3"
+pandas = "^1.3.1"
+openpyxl = "^3.0.7"
+yapf = "^0.31.0"
+flake8 = "^3.9.2"
+typer = "^0.3.2"
+
+[tool.poetry.dev-dependencies]
+pytest = "^5.2"
+
+[tool.poetry.scripts]
+pyplt = "pyplot_cli.cli:run"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_pyplt.py b/tests/test_pyplt.py
new file mode 100644
index 0000000..56d9b45
--- /dev/null
+++ b/tests/test_pyplt.py
@@ -0,0 +1,5 @@
+from pyplt import __version__
+
+
+def test_version():
+    assert __version__ == '0.1.0'