config.yml

---
#
# Python CircleCI 2.0 configuration file
# Check https://circleci.com/docs/2.0/language-python/ for more details.
#
version: 2.1
orbs: 
  shellcheck: circleci/shellcheck@3.1.0
jobs:
  build:
    docker:
      - image: cimg/base:stable
    working_directory: ~/repo
    resource_class: small
    steps:
      - checkout
      - run:
          name: Install ShellCheck
          command: |
            set -e
            set -u
            set -o pipefail
            # Check if we are root or need sudo.
            if [[ ${EUID} == 0 ]]; then
                export SUDO=''
            else
                export SUDO='sudo'
            fi
            SHELLCHECK_VERSION=0.8.0
            wget -qO- "https://github.com/koalaman/shellcheck/releases/download/v${SHELLCHECK_VERSION}/shellcheck-v${SHELLCHECK_VERSION}.linux.x86_64.tar.xz" \
                | tar -xJf -
            cd "shellcheck-v${SHELLCHECK_VERSION}/"
            ${SUDO} cp shellcheck /usr/local/bin/
      - run:
          name: Run IndentationCheck
          shell: /bin/bash
          command: |
            set -e
            set -u
            set -o pipefail
            check/indentationcheck.sh
      - run:
          name: Run ShellCheck
          shell: /bin/bash
          command: |
            set -e
            set -u
            set -o pipefail
            check/shellcheck.sh
...