Merge #17353: doc: Add ShellCheck to lint tests dependencies

80c9e66 build: Remove install command samples (Hennadii Stepanov)
2ad74b7 doc: Add ShellCheck to lint tests dependencies (Hennadii Stepanov)

Pull request description:

  In master (9641366) the lint tests dependencies list lacks ShellCheck. This PR fixes it.

  Also `lint-python.sh` is slightly improved.

ACKs for top commit:
  laanwj:
    ACK 80c9e66
  promag:
    ACK 80c9e66, verified internal and external links. Nice looking table.

Tree-SHA512: b63718a6c41be93137db70586465d84ca0b1ff33c0f2674147c928cb1bdf903ec7587861c09ad832841264285f99c7b171d5319eef3c989822a7cd01449222ae

Author: MarcoFalke

test/README.md

@@ -254,7 +254,13 @@ Use the `-v` option for verbose output.
 
 #### Dependencies
 
-The lint tests require codespell and flake8. To install: `pip3 install codespell flake8`.
+| Lint test | Dependency | Version [used by CI](../ci/lint/04_install.sh) | Installation
+|-----------|:----------:|:-------------------------------------------:|--------------
+| [`lint-python.sh`](lint/lint-python.sh) | [flake8](https://gitlab.com/pycqa/flake8) | [3.7.8](https://github.com/bitcoin/bitcoin/pull/15257) | `pip3 install flake8==3.7.8`
+| [`lint-shell.sh`](lint/lint-shell.sh) | [ShellCheck](https://github.com/koalaman/shellcheck) | [0.6.0](https://github.com/bitcoin/bitcoin/pull/15166) | [details...](https://github.com/koalaman/shellcheck#installing)
+| [`lint-spelling.sh`](lint/lint-spelling.sh) | [codespell](https://github.com/codespell-project/codespell) | [1.15.0](https://github.com/bitcoin/bitcoin/pull/16186) | `pip3 install codespell==1.15.0`
+
+Please be aware that on Linux distributions all dependencies are usually available as packages, but could be outdated.
 
 #### Running the tests
 

test/lint/lint-python.sh

@@ -82,10 +82,10 @@ enabled=(
 )
 
 if ! command -v flake8 > /dev/null; then
-    echo "Skipping Python linting since flake8 is not installed. Install by running \"pip3 install flake8\""
+    echo "Skipping Python linting since flake8 is not installed."
     exit 0
 elif PYTHONWARNINGS="ignore" flake8 --version | grep -q "Python 2"; then
-    echo "Skipping Python linting since flake8 is running under Python 2. Install the Python 3 version of flake8 by running \"pip3 install flake8\""
+    echo "Skipping Python linting since flake8 is running under Python 2. Install the Python 3 version of flake8."
     exit 0
 fi