diff --git a/.gitignore b/.gitignore
index 0351cb6a..8663a7f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,7 +55,10 @@ _extras/
 *.sublime-*
 site/
 
-.coverage
 .vscode/settings.json
 coverage.xml
-.vscode/launch.json
\ No newline at end of file
+.vscode/launch.json
+.coverage
+.vscode/tasks.json
+todo.txt
+
diff --git a/docs/advanced.md b/docs/advanced.md
index 51c4d1af..a778bd29 100644
--- a/docs/advanced.md
+++ b/docs/advanced.md
@@ -61,6 +61,28 @@ and can be edited with a plain text editor.
   Or use the built-in prompt or an external editor to compose your
   entries.
 
+### Modifying Configurations from the Command line 
+
+You can override a configuration field for the current instance of `jrnl` using `--config-override CONFIG_KEY:CONFIG_VALUE` where `CONFIG_KEY` is a valid configuration field, specified in dot-notation and `CONFIG_VALUE` is the (valid) desired override value.
+
+You can specify multiple overrides as a comma-separated list.
+!!! note
+    These overrides allow you to modify ***any*** field of your jrnl configuration. We trust that you know what you are doing. 
+
+#### Examples: 
+
+``` sh
+#Create an entry using the `stdin` prompt, for rapid logging
+jrnl --config-override editor:""
+
+#Populate a project's log
+jrnl --config-override journal:"$(git rev-parse --show-toplevel)/todo.txt"
+
+#Pass multiple overrides 
+jrnl --config-override display_format:fancy,linewrap:20,colors.title:green
+
+```
+
 ## Multiple journal files
 
 You can configure `jrnl`to use with multiple journals (eg.
diff --git a/docs/recipes.md b/docs/recipes.md
index 14e08e14..ef45666a 100644
--- a/docs/recipes.md
+++ b/docs/recipes.md
@@ -154,6 +154,33 @@ only field 1.
 jrnl -on "$(jrnl --short | shuf -n 1 | cut -d' ' -f1,2)"
 ```
 
+
+### Launch a terminal for rapid logging 
+You can use this to launch a terminal that is the `jrnl` stdin prompt so you can start typing away immediately. 
+
+```bash
+jrnl now --config-override editor:""
+```
+
+Bind this to a keyboard shortcut. 
+
+Map `Super+Alt+J` to launch the terminal with jrnl prompt
+
+- **xbindkeys**
+In your `.xbindkeysrc`
+
+```ini
+Mod4+Mod1+j
+ alacritty -t floating-jrnl -e jrnl now --config-override editor:"",
+```
+
+- **I3 WM** Launch a floating terminal with the `jrnl` prompt
+
+```ini
+bindsym Mod4+Mod1+j exec --no-startup-id alacritty -t floating-jrnl -e jrnl --config-override editor:""
+for_window[title="floating *"] floating enable
+```
+
 ## External editors
 
 Configure your preferred external editor by updating the `editor` option 
diff --git a/features/data/configs/tiny.yaml b/features/data/configs/tiny.yaml
new file mode 100644
index 00000000..578cd234
--- /dev/null
+++ b/features/data/configs/tiny.yaml
@@ -0,0 +1,8 @@
+journals:
+  default: features/journals/simple.journal
+colors:
+  body: none 
+  title: green 
+editor: "vim"
+encrypt: false
+#
\ No newline at end of file
diff --git a/features/overrides.feature b/features/overrides.feature
new file mode 100644
index 00000000..103a43ac
--- /dev/null
+++ b/features/overrides.feature
@@ -0,0 +1,53 @@
+Feature: Implementing Runtime Overrides for Select Configuration Keys
+
+        Scenario: Override configured editor with built-in input === editor:''
+        Given we use the config "tiny.yaml"
+        When we run jrnl with --config-override editor ''
+        Then the stdin prompt must be launched 
+
+        @skip_win
+        Scenario: Override configured linewrap with a value of 23
+        Given we use the config "tiny.yaml"
+        When we run "jrnl  -2 --config-override linewrap 23 --format fancy"
+        Then the output should be
+
+        """
+        ┎─────╮2013-06-09 15:39
+        ┃ My  ╘═══════════════╕
+        ┃ fir st  ent ry.     │
+        ┠╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
+        ┃ Everything is       │
+        ┃ alright             │
+        ┖─────────────────────┘
+        ┎─────╮2013-06-10 15:40
+        ┃ Lif ╘═══════════════╕
+        ┃ e is  goo d.        │
+        ┠╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┤
+        ┃ But I'm better.     │
+        ┖─────────────────────┘
+        """
+
+        @skip_win
+        Scenario: Override color selections with runtime overrides 
+        Given we use the config "tiny.yaml"
+        When we run jrnl with -1 --config-override colors.body blue
+        Then the runtime config should have colors.body set to blue
+
+        @skip_win 
+        Scenario: Apply multiple config overrides 
+        Given we use the config "tiny.yaml" 
+        When we run jrnl with -1 --config-override colors.body green --config-override editor "nano"
+        Then the runtime config should have colors.body set to green 
+        And the runtime config should have editor set to nano
+
+
+        @skip_win
+        Scenario Outline: Override configured editor
+        Given we use the config "tiny.yaml" 
+        When we run jrnl with --config-override editor "<editor>"
+        Then the editor <editor> should have been called
+        Examples: Editor Commands
+        | editor            |
+        | nano              |
+        | vi -c startinsert | 
+        | code -w -         | 
diff --git a/features/steps/core.py b/features/steps/core.py
index 97128094..9ac7d50a 100644
--- a/features/steps/core.py
+++ b/features/steps/core.py
@@ -13,6 +13,7 @@ from behave import given
 from behave import then
 from behave import when
 import keyring
+
 import toml
 import yaml
 
diff --git a/features/steps/override.py b/features/steps/override.py
new file mode 100644
index 00000000..d1857b0b
--- /dev/null
+++ b/features/steps/override.py
@@ -0,0 +1,123 @@
+from jrnl.jrnl import run
+from jrnl.os_compat import split_args
+from unittest import mock
+
+# from __future__ import with_statement
+from jrnl.args import parse_args
+import os
+from behave import given, when, then
+import yaml
+from yaml.loader import FullLoader
+
+import jrnl
+
+
+def _mock_time_parse(context):
+    original_parse = jrnl.time.parse
+    if "now" not in context:
+        return original_parse
+
+    def wrapper(input, *args, **kwargs):
+        input = context.now if input == "now" else input
+        return original_parse(input, *args, **kwargs)
+
+    return wrapper
+
+
+@given("we use the config {config_file}")
+def load_config(context, config_file):
+    filepath = os.path.join("features/configs", config_file)
+    context.config_path = os.path.abspath(filepath)
+
+
+@when("we run jrnl with {args}")
+def run_command(context, args):
+    context.args = split_args("%s" % args)
+    context.parser = parse_args(context.args)
+    with open(context.config_path, "r") as f:
+        cfg = yaml.load(f, Loader=FullLoader)
+    context.cfg = cfg
+
+
+@then("the runtime config should have {key_as_dots} set to {override_value}")
+def config_override(context, key_as_dots: str, override_value: str):
+    key_as_vec = key_as_dots.split(".")
+
+    def _mock_callback(**args):
+        print("callback executed")
+
+    # fmt: off
+    try: 
+        with \
+        mock.patch("jrnl.jrnl.search_mode"), \
+        mock.patch.object(jrnl.override,"_recursively_apply",wraps=jrnl.override._recursively_apply) as mock_recurse, \
+        mock.patch('jrnl.install.load_or_install_jrnl', return_value=context.cfg), \
+        mock.patch('jrnl.time.parse', side_effect=_mock_time_parse(context)), \
+        mock.patch("jrnl.config.get_config_path", side_effect=lambda: context.config_path), \
+        mock.patch("jrnl.install.get_config_path", side_effect=lambda: context.config_path) \
+        : 
+            run(context.parser)
+        runtime_cfg = mock_recurse.call_args_list[0][0][0]
+        
+        for k in key_as_vec: 
+            runtime_cfg = runtime_cfg['%s'%k]
+
+        assert runtime_cfg == override_value
+    except SystemExit as e :
+        context.exit_status = e.code
+    # fmt: on
+
+
+@then("the editor {editor} should have been called")
+def editor_override(context, editor):
+    def _mock_write_in_editor(config):
+        editor = config["editor"]
+        journal = "features/journals/journal.jrnl"
+        context.tmpfile = journal
+        print("%s has been launched" % editor)
+        return journal
+
+    # fmt: off
+    # see: https://github.com/psf/black/issues/664
+    with \
+        mock.patch("jrnl.jrnl._write_in_editor", side_effect=_mock_write_in_editor(context.cfg)) as mock_write_in_editor, \
+        mock.patch("sys.stdin.isatty", return_value=True), \
+        mock.patch("jrnl.time.parse", side_effect = _mock_time_parse(context)), \
+        mock.patch("jrnl.config.get_config_path", side_effect=lambda: context.config_path), \
+        mock.patch("jrnl.install.get_config_path", side_effect=lambda: context.config_path) \
+    :
+        try :
+                run(context.parser)
+                context.exit_status = 0
+                context.editor = mock_write_in_editor
+                expected_config = context.cfg
+                expected_config['editor'] = '%s'%editor 
+                expected_config['journal'] ='features/journals/journal.jrnl'
+
+                assert mock_write_in_editor.call_count == 1
+                assert mock_write_in_editor.call_args[0][0]['editor']==editor
+        except SystemExit as e:
+            context.exit_status = e.code
+    # fmt: on
+
+
+@then("the stdin prompt must be launched")
+def override_editor_to_use_stdin(context):
+
+    try:
+        with mock.patch(
+            "sys.stdin.read",
+            return_value="Zwei peanuts walk into a bar und one of zem was a-salted",
+        ) as mock_stdin_read, mock.patch(
+            "jrnl.install.load_or_install_jrnl", return_value=context.cfg
+        ), mock.patch(
+            "jrnl.Journal.open_journal",
+            spec=False,
+            return_value="features/journals/journal.jrnl",
+        ):
+            run(context.parser)
+            context.exit_status = 0
+        mock_stdin_read.assert_called_once()
+
+    except SystemExit as e:
+        context.exit_status = e.code
diff --git a/jrnl/args.py b/jrnl/args.py
index f934ca16..b3a04192 100644
--- a/jrnl/args.py
+++ b/jrnl/args.py
@@ -17,6 +17,48 @@ from .plugins import IMPORT_FORMATS
 from .plugins import util
 
 
+def deserialize_config_args(input: list) -> dict:
+
+    """
+
+    Convert a two-element list of configuration key-value pair into a flat dict
+
+    :param input: list of configuration keys in dot-notation and their respective values.
+    :type input: list
+    :return: A single level dict of the configuration keys in dot-notation and their respective desired values
+    :rtype: dict
+    """
+
+    assert len(input) == 2
+    runtime_modifications = {}
+
+    cfg_key = input[0]
+    cfg_value = input[1]
+    cfg_value = cfg_value.strip()
+
+    # Convert numbers and booleans
+    if cfg_value.isdigit():
+        cfg_value = int(cfg_value)
+    elif cfg_value.lower() == "true":
+        cfg_value = True
+    elif cfg_value.lower() == "false":
+        cfg_value = False
+        
+    runtime_modifications[cfg_key] = cfg_value
+
+    return runtime_modifications
+
+
+class ConfigurationAction(argparse.Action):
+    def __init__(self, **kwargs) -> None:
+        super().__init__(**kwargs)
+
+    def __call__(self, parser, namespace, values, option_strings=None) -> None:
+        cfg_overrides = getattr(namespace, self.dest, [])
+        cfg_overrides.append(deserialize_config_args(values))
+        setattr(namespace, self.dest, cfg_overrides)
+
+
 class WrappingFormatter(argparse.RawTextHelpFormatter):
     """Used in help screen"""
 
@@ -314,8 +356,32 @@ def parse_args(args=[]):
         help=argparse.SUPPRESS,
     )
 
+    config_overrides = parser.add_argument_group(
+        "Config file override",
+        textwrap.dedent("Apply a one-off override of the config file option"),
+    )
+    config_overrides.add_argument(
+        "--config-override",
+        dest="config_override",
+        action=ConfigurationAction,
+        type=str,
+        nargs=2,
+        default=[],
+        metavar="CONFIG_KV_PAIR",
+        help="""
+        Override configured key-value pair with CONFIG_KV_PAIR for this command invocation only.
+
+        Examples: \n
+        \t - Use a different editor for this jrnl entry, call: \n
+            \t jrnl --config-override editor: "nano" \n
+        \t - Override color selections\n
+           \t jrnl --config-override colors.body blue --config-override colors.title green
+        """,
+    )
+
     # Handle '-123' as a shortcut for '-n 123'
     num = re.compile(r"^-(\d+)$")
     args = [num.sub(r"-n \1", arg) for arg in args]
 
-    return parser.parse_intermixed_args(args)
+    parsed_args = parser.parse_intermixed_args(args)
+    return parsed_args
diff --git a/jrnl/jrnl.py b/jrnl/jrnl.py
index 257358c4..25fd191a 100644
--- a/jrnl/jrnl.py
+++ b/jrnl/jrnl.py
@@ -16,6 +16,7 @@ from .editor import get_text_from_editor
 from .editor import get_text_from_stdin
 from .exception import UserAbort
 from . import time
+from .override import apply_overrides
 
 
 def run(args):
@@ -49,6 +50,11 @@ def run(args):
             args=args, config=config, original_config=original_config
         )
 
+    # Apply config overrides
+    overrides = args.config_override
+    if overrides:
+        config = apply_overrides(overrides, config)
+
     # --- All the standalone commands are now done --- #
 
     # Get the journal we're going to be working with
diff --git a/jrnl/override.py b/jrnl/override.py
new file mode 100644
index 00000000..82d6da93
--- /dev/null
+++ b/jrnl/override.py
@@ -0,0 +1,47 @@
+# import logging
+def apply_overrides(overrides: list, base_config: dict) -> dict:
+    """Unpack CLI provided overrides into the configuration tree.
+
+    :param overrides: List of configuration key-value pairs collected from the CLI
+    :type overrides: list
+    :param base_config: Configuration Loaded from the saved YAML
+    :type base_config: dict
+    :return: Configuration to be used during runtime with the overrides applied
+    :rtype: dict
+    """
+    config = base_config.copy()
+    for pairs in overrides:
+
+        key_as_dots, override_value = list(pairs.items())[0]
+        keys = key_as_dots.split(".")
+        config = _recursively_apply(config, keys, override_value)
+
+    return config
+
+
+def _recursively_apply(tree: dict, nodes: list, override_value) -> dict:
+    """Recurse through configuration and apply overrides at the leaf of the config tree
+
+    Credit to iJames on SO: https://stackoverflow.com/a/47276490 for algorithm
+
+    Args:
+        config (dict): Configuration to modify
+        nodes (list): Vector of override keys; the length of the vector indicates tree depth
+        override_value (str): Runtime override passed from the command-line
+    """
+    key = nodes[0]
+    if len(nodes) == 1:
+        tree[key] = override_value
+    else:
+        next_key = nodes[1:]
+        _recursively_apply(_get_config_node(tree, key), next_key, override_value)
+
+    return tree
+
+
+def _get_config_node(config: dict, key: str):
+    if key in config:
+        pass
+    else:
+        config[key] = None
+    return config[key]
diff --git a/poetry.lock b/poetry.lock
index 50135423..cc651d00 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -127,6 +127,17 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
+[[package]]
+name = "coverage"
+version = "5.4"
+description = "Code coverage measurement for Python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
+
+[package.extras]
+toml = ["toml"]
+
 [[package]]
 name = "cryptography"
 version = "3.3.1"
@@ -156,18 +167,19 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "importlib-metadata"
-version = "3.1.1"
+version = "3.4.0"
 description = "Read metadata from Python packages"
 category = "main"
 optional = false
 python-versions = ">=3.6"
 
 [package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "jaraco.test (>=3.2.0)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
 
 [[package]]
 name = "iniconfig"
@@ -204,8 +216,8 @@ i18n = ["Babel (>=0.8)"]
 
 [[package]]
 name = "joblib"
-version = "0.17.0"
-description = "Lightweight pipelining: using Python functions as pipeline jobs."
+version = "1.0.0"
+description = "Lightweight pipelining with Python functions"
 category = "dev"
 optional = false
 python-versions = ">=3.6"
@@ -295,6 +307,19 @@ Markdown = ">=3.2.1"
 PyYAML = ">=3.10"
 tornado = ">=5.0"
 
+[[package]]
+name = "mock"
+version = "4.0.3"
+description = "Rolling backport of unittest.mock for all Pythons"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+build = ["twine", "wheel", "blurb"]
+docs = ["sphinx"]
+test = ["pytest (<5.4)", "pytest-cov"]
+
 [[package]]
 name = "mypy-extensions"
 version = "0.4.3"
@@ -338,7 +363,7 @@ pyparsing = ">=2.0.2"
 
 [[package]]
 name = "parse"
-version = "1.18.0"
+version = "1.19.0"
 description = "parse() is the opposite of format()"
 category = "dev"
 optional = false
@@ -444,6 +469,35 @@ toml = "*"
 [package.extras]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
+[[package]]
+name = "pytest-cov"
+version = "2.11.1"
+description = "Pytest plugin for measuring coverage."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.dependencies]
+coverage = ">=5.2.1"
+pytest = ">=4.6"
+
+[package.extras]
+testing = ["fields", "hunter", "process-tests (==2.0.2)", "six", "pytest-xdist", "virtualenv"]
+
+[[package]]
+name = "pytest-mock"
+version = "3.5.1"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[package.dependencies]
+pytest = ">=5.0"
+
+[package.extras]
+dev = ["pre-commit", "tox", "pytest-asyncio"]
+
 [[package]]
 name = "python-dateutil"
 version = "2.8.1"
@@ -457,7 +511,7 @@ six = ">=1.5"
 
 [[package]]
 name = "pytz"
-version = "2020.5"
+version = "2021.1"
 description = "World timezone definitions, modern and historical"
 category = "main"
 optional = false
@@ -541,18 +595,19 @@ python-versions = ">= 3.5"
 
 [[package]]
 name = "tqdm"
-version = "4.54.1"
+version = "4.56.0"
 description = "Fast, Extensible Progress Meter"
 category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.extras]
-dev = ["py-make (>=0.1.0)", "twine", "argopt", "pydoc-markdown", "wheel"]
+dev = ["py-make (>=0.1.0)", "twine", "wheel"]
+telegram = ["requests"]
 
 [[package]]
 name = "typed-ast"
-version = "1.4.1"
+version = "1.4.2"
 description = "a fork of Python 2 and 3 ast modules with type comment support"
 category = "dev"
 optional = false
@@ -562,7 +617,7 @@ python-versions = "*"
 name = "typing-extensions"
 version = "3.7.4.3"
 description = "Backported and Experimental Type Hints for Python 3.5+"
-category = "dev"
+category = "main"
 optional = false
 python-versions = "*"
 
@@ -616,7 +671,7 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.7.0, <3.10"
-content-hash = "1757c9f22bd1c3e2e4c6b7785d4c8e14a670334a21ab5de2137faf0fd10819b9"
+content-hash = "fb7f55245f566cc5dcb849ce3a2f186e2ed090c802e6a2aba84fb70359ed69ea"
 
 [metadata.files]
 ansiwrap = [
@@ -695,6 +750,57 @@ colorama = [
     {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
 ]
+coverage = [
+    {file = "coverage-5.4-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:6d9c88b787638a451f41f97446a1c9fd416e669b4d9717ae4615bd29de1ac135"},
+    {file = "coverage-5.4-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:66a5aae8233d766a877c5ef293ec5ab9520929c2578fd2069308a98b7374ea8c"},
+    {file = "coverage-5.4-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:9754a5c265f991317de2bac0c70a746efc2b695cf4d49f5d2cddeac36544fb44"},
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@@ -800,7 +929,7 @@ packaging = [
     {file = "packaging-20.8.tar.gz", hash = "sha256:78598185a7008a470d64526a8059de9aaa449238f280fc9eb6b13ba6c4109093"},
 ]
 parse = [
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+    {file = "parse-1.19.0.tar.gz", hash = "sha256:9ff82852bcb65d139813e2a5197627a94966245c897796760a3a2a8eb66f020b"},
 ]
 parse-type = [
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@@ -843,8 +972,8 @@ python-dateutil = [
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 ]
 pytz = [
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+    {file = "pytz-2021.1-py2.py3-none-any.whl", hash = "sha256:eb10ce3e7736052ed3623d49975ce333bcd712c7bb19a58b9e2089d4057d0798"},
+    {file = "pytz-2021.1.tar.gz", hash = "sha256:83a4a90894bf38e243cf052c8b58f381bfe9a7a483f6a9cab140bc7f702ac4da"},
 ]
 pywin32-ctypes = [
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@@ -980,40 +1109,40 @@ tornado = [
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 ]
 tqdm = [
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-    {file = "tqdm-4.54.1.tar.gz", hash = "sha256:38b658a3e4ecf9b4f6f8ff75ca16221ae3378b2e175d846b6b33ea3a20852cf5"},
+    {file = "tqdm-4.56.0-py2.py3-none-any.whl", hash = "sha256:4621f6823bab46a9cc33d48105753ccbea671b68bab2c50a9f0be23d4065cb5a"},
+    {file = "tqdm-4.56.0.tar.gz", hash = "sha256:fe3d08dd00a526850568d542ff9de9bbc2a09a791da3c334f3213d8d0bbbca65"},
 ]
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+    {file = "typed_ast-1.4.2-cp38-cp38-win_amd64.whl", hash = "sha256:c0c74e5579af4b977c8b932f40a5464764b2f86681327410aa028a22d2f54937"},
+    {file = "typed_ast-1.4.2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:07d49388d5bf7e863f7fa2f124b1b1d89d8aa0e2f7812faff0a5658c01c59aa1"},
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+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:d746a437cdbca200622385305aedd9aef68e8a645e385cc483bdc5e488f07166"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:14bf1522cdee369e8f5581238edac09150c765ec1cb33615855889cf33dcb92d"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win32.whl", hash = "sha256:cc7b98bf58167b7f2db91a4327da24fb93368838eb84a44c472283778fc2446b"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win_amd64.whl", hash = "sha256:7147e2a76c75f0f64c4319886e7639e490fee87c9d25cb1d4faef1d8cf83a440"},
+    {file = "typed_ast-1.4.2.tar.gz", hash = "sha256:9fc0b3cb5d1720e7141d103cf4819aea239f7d136acf9ee4a69b047b7986175a"},
 ]
 typing-extensions = [
     {file = "typing_extensions-3.7.4.3-py2-none-any.whl", hash = "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"},
diff --git a/pyproject.toml b/pyproject.toml
index e47f27f7..2d337d9d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,7 @@ pyyaml = ">=5.1"
 # dayone-only deps
 pytz = ">=2020"          # https://pythonhosted.org/pytz/#issues-limitations
 tzlocal = ">2.0, <3.0"   # https://github.com/regebro/tzlocal/blob/master/CHANGES.txt
+mock = "^4.0.3"
 
 [tool.poetry.dev-dependencies]
 behave = "^1.2"
@@ -45,8 +46,9 @@ black = {version = "^20.8b1",allow-prereleases = true}
 toml = ">=0.10"
 pyflakes = ">=2.2.0"
 pytest = ">=6.2"
+pytest-mock = "^3.5.1"
+pytest-cov = "^2.11.1"
 yq = ">=2.11"
-
 [tool.poetry.scripts]
 jrnl = 'jrnl.cli:cli'
 
diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 00000000..aa1b01ee
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,97 @@
+import shlex
+import pytest
+import mock
+
+
+from jrnl.args import parse_args
+from jrnl.jrnl import run
+from jrnl import install
+from jrnl import jrnl
+
+
+@pytest.fixture()
+def minimal_config():
+    cfg = {
+        "colors": {"body": "red", "date": "green"},
+        "default": "/tmp/journal.jrnl",
+        "editor": "vim",
+        "encrypt": False,
+        "journals": {"default": "/tmp/journals/journal.jrnl"},
+    }
+    yield cfg
+
+
+@pytest.fixture()
+def expected_override(minimal_config):
+    exp_out_cfg = minimal_config.copy()
+    exp_out_cfg["editor"] = "nano"
+    exp_out_cfg["journal"] = "/tmp/journals/journal.jrnl"
+    yield exp_out_cfg
+
+
+@mock.patch("sys.stdin.isatty")
+@mock.patch.object(install, "load_or_install_jrnl")
+@mock.patch("subprocess.call")
+def test_override_configured_editor(
+    mock_subprocess_call,
+    mock_load_or_install,
+    mock_isatty,
+    minimal_config,
+    expected_override,
+    capsys,
+):
+    mock_load_or_install.return_value = minimal_config
+    mock_isatty.return_value = True
+
+    cli_args = shlex.split('--config-override editor "nano"')
+    parser = parse_args(cli_args)
+    assert parser.config_override.__len__() == 1
+    assert {"editor": "nano"} in parser.config_override
+
+    def mock_editor_launch(editor):
+        print("%s launched! Success!" % editor)
+
+    with mock.patch.object(
+        jrnl,
+        "_write_in_editor",
+        side_effect=mock_editor_launch("TODO: replace"),
+        return_value="note_contents",
+    ) as mock_write_in_editor:
+        run(parser)
+    mock_write_in_editor.assert_called_once_with(expected_override)
+
+
+@pytest.fixture()
+def expected_color_override(minimal_config):
+    exp_out_cfg = minimal_config.copy()
+    exp_out_cfg["colors"]["body"] = "blue"
+    exp_out_cfg["journal"] = "/tmp/journals/journal.jrnl"
+    yield exp_out_cfg
+
+
+@mock.patch("sys.stdin.isatty")
+@mock.patch(
+    "jrnl.install.load_or_install_jrnl", wraps=jrnl.install.load_or_install_jrnl
+)
+@mock.patch("subprocess.call")
+def test_override_configured_colors(
+    mock_isatty,
+    mock_load_or_install,
+    mock_subprocess_call,
+    minimal_config,
+    expected_color_override,
+    capsys,
+):
+    mock_load_or_install.return_value = minimal_config
+
+    cli_args = shlex.split("--config-override colors.body blue")
+    parser = parse_args(cli_args)
+    assert {"colors.body": "blue"} in parser.config_override
+    with mock.patch.object(
+        jrnl,
+        "_write_in_editor",
+        side_effect=print("side effect!"),
+        return_value="note_contents",
+    ) as mock_write_in_editor:
+        run(parser)
+    mock_write_in_editor.assert_called_once_with(expected_color_override)
diff --git a/tests/test_override.py b/tests/test_override.py
new file mode 100644
index 00000000..c673f304
--- /dev/null
+++ b/tests/test_override.py
@@ -0,0 +1,54 @@
+import pytest
+
+from jrnl.override import apply_overrides, _recursively_apply, _get_config_node
+
+
+@pytest.fixture()
+def minimal_config():
+    cfg = {
+        "colors": {"body": "red", "date": "green"},
+        "default": "/tmp/journal.jrnl",
+        "editor": "vim",
+        "journals": {"default": "/tmp/journals/journal.jrnl"},
+    }
+    yield cfg
+
+
+def test_apply_override(minimal_config):
+    config = minimal_config.copy()
+    overrides = [{"editor": "nano"}]
+    config = apply_overrides(overrides, config)
+    assert config["editor"] == "nano"
+
+
+def test_override_dot_notation(minimal_config):
+    cfg = minimal_config.copy()
+    overrides = [{"colors.body": "blue"}]
+    cfg = apply_overrides(overrides=overrides, base_config=cfg)
+    assert cfg["colors"] == {"body": "blue", "date": "green"}
+
+
+def test_multiple_overrides(minimal_config):
+    overrides = [
+        {"colors.title": "magenta"},
+        {"editor": "nano"},
+        {"journals.burner": "/tmp/journals/burner.jrnl"},
+    ]  # as returned by parse_args, saved in parser.config_override
+
+    cfg = apply_overrides(overrides, minimal_config.copy())
+    assert cfg["editor"] == "nano"
+    assert cfg["colors"]["title"] == "magenta"
+    assert "burner" in cfg["journals"]
+    assert cfg["journals"]["burner"] == "/tmp/journals/burner.jrnl"
+
+
+def test_recursively_apply():
+    cfg = {"colors": {"body": "red", "title": "green"}}
+    cfg = _recursively_apply(cfg, ["colors", "body"], "blue")
+    assert cfg["colors"]["body"] == "blue"
+
+
+def test_get_config_node(minimal_config):
+    assert len(minimal_config.keys()) == 4
+    assert _get_config_node(minimal_config, "editor") == "vim"
+    assert _get_config_node(minimal_config, "display_format") == None
diff --git a/tests/test_parse_args.py b/tests/test_parse_args.py
index 252638c9..feb31d07 100644
--- a/tests/test_parse_args.py
+++ b/tests/test_parse_args.py
@@ -3,6 +3,7 @@ import shlex
 import pytest
 
 from jrnl.args import parse_args
+from jrnl.args import deserialize_config_args
 
 
 def cli_as_dict(str):
@@ -35,6 +36,7 @@ def expected_args(**kwargs):
         "strict": False,
         "tags": False,
         "text": [],
+        "config_override": [],
     }
     return {**default_args, **kwargs}
 
@@ -205,6 +207,31 @@ def test_version_alone():
     assert cli_as_dict("--version") == expected_args(preconfig_cmd=preconfig_version)
 
 
+def test_editor_override():
+
+    parsed_args = cli_as_dict('--config-override editor "nano"')
+    assert parsed_args == expected_args(config_override=[{"editor": "nano"}])
+
+
+def test_color_override():
+    assert cli_as_dict("--config-override colors.body blue") == expected_args(
+        config_override=[{"colors.body": "blue"}]
+    )
+
+
+def test_multiple_overrides():
+    parsed_args = cli_as_dict(
+        '--config-override colors.title green --config-override editor "nano" --config-override journal.scratchpad "/tmp/scratchpad"'
+    )
+    assert parsed_args == expected_args(
+        config_override=[
+            {"colors.title": "green"},
+            {"editor": "nano"},
+            {"journal.scratchpad": "/tmp/scratchpad"},
+        ]
+    )
+
+
 # @see https://github.com/jrnl-org/jrnl/issues/520
 @pytest.mark.parametrize(
     "cli",
@@ -233,3 +260,33 @@ def test_and_ordering(cli):
 def test_edit_ordering(cli):
     result = expected_args(edit=True, text=["second", "@oldtag", "@newtag"])
     assert cli_as_dict(cli) == result
+
+
+class TestDeserialization:
+    @pytest.mark.parametrize(
+        "input_str",
+        [
+            ["editor", '"nano"'],
+            ["colors.title", "blue"],
+            ["default", "/tmp/egg.txt"],
+        ],
+    )
+    def test_deserialize_multiword_strings(self, input_str):
+
+        runtime_config = deserialize_config_args(input_str)
+        assert runtime_config.__class__ == dict
+        assert input_str[0] in runtime_config.keys()
+        assert runtime_config[input_str[0]] == input_str[1]
+
+    def test_deserialize_multiple_datatypes(self):
+        cfg = deserialize_config_args(["linewrap", "23"])
+        assert cfg["linewrap"] == 23
+
+        cfg = deserialize_config_args(["encrypt", "false"])
+        assert cfg["encrypt"] == False
+
+        cfg = deserialize_config_args(["editor", '"vi -c startinsert"'])
+        assert cfg["editor"] == '"vi -c startinsert"'
+
+        cfg = deserialize_config_args(["highlight", "true"])
+        assert cfg["highlight"] == True