diff --git a/.github/workflows/interactive-command.yml b/.github/workflows/interactive-command.yml
index 3e20b1a..cd07246 100644
--- a/.github/workflows/interactive-command.yml
+++ b/.github/workflows/interactive-command.yml
@@ -6,11 +6,11 @@ on:
       command:
         description: "Command to execute"
         required: true
-        default: "sed --version"
+        default: "demo/all-demos.sh"
       os:
         description: "Operating system to run the command on"
         required: true
-        default: "ubuntu-latest"
+        default: "macos-latest"
         type: choice
         options:
           - ubuntu-latest
@@ -21,6 +21,9 @@ on:
         default: false
         type: boolean
 
+run-name: |
+  ICE: ${{ inputs.command }} (${{ inputs.os }}, GNU? ${{ inputs.install_gnu_tools }})
+
 permissions:
   contents: read
 
@@ -29,30 +32,16 @@ jobs:
     runs-on: ${{ inputs.os }}
 
     steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+          submodules: recursive
+
       - name: Install GNU tools on macOS
-        if: runner.os == 'macos-latest' && inputs.install_gnu_tools == 'true'
+        if: ${{ inputs.install_gnu_tools }}
         run: |
-          brew install gnu-sed gawk grep findutils coreutils gnu-tar gnu-time gnu-indent gnu-getopt gnu-which
-          brew install gdate gxargs gcut ghead gtail gtr guniq gwc gdiff
-          echo 'export PATH="/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gawk/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/grep/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/findutils/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/coreutils/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gnu-tar/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gnu-time/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gnu-indent/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gnu-getopt/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gnu-which/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gdate/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gxargs/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gcut/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/ghead/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gtail/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gtr/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/guniq/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gwc/libexec/gnubin:$PATH"' >> $GITHUB_ENV
-          echo 'export PATH="/usr/local/opt/gdiff/libexec/gnubin:$PATH"' >> $GITHUB_ENV
+          bin/gnu-install.sh
 
       - name: Execute command
         run: ${{ inputs.command }}
diff --git a/bin/gnu-install.sh b/bin/gnu-install.sh
new file mode 100755
index 0000000..b0b139e
--- /dev/null
+++ b/bin/gnu-install.sh
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+###
+### Script to install GNU tools (typically on macOS).
+###
+### Requires `brew` to be installed.
+###
+
+set -o errexit  # abort on nonzero exit status
+set -o nounset  # abort on unbound variable
+set -o pipefail # don't hide errors within pipes
+
+### GNU Tools to install
+###
+### References:
+### - https://gist.github.com/skyzyx/3438280b18e4f7c490db8a2a2ca0b9da
+### - https://www.topbug.net/blog/2013/04/14/install-and-use-gnu-command-line-tools-in-mac-os-x/
+### https://github.com/asantra1/macOS-gnu-tools/blob/master/gnu-cmd.sh
+
+declare -a GNU_TOOLS=(
+  "binutils"
+  "coreutils"
+  "diffutils"
+  "ed"
+  "findutils"
+  "gawk"
+  "gnu-indent"
+  "gnu-sed"
+  "gnu-tar"
+  "gnu-which"
+  "gnutls"
+  "grep"
+  "gzip"
+  "screen"
+  "watch"
+  "wdiff"
+  "wget"
+)
+
+### Validate `brew` is installed
+if ! command -v brew &>/dev/null; then
+  echo "Error: 'brew' is required. Please install it first."
+  exit 1
+fi
+
+### Install GNU Tools
+for tool in "${GNU_TOOLS[@]}"; do
+  if brew list --formula | grep -q "^${tool}\$"; then
+    if brew outdated --formula | grep -q "^${tool}\$"; then
+      echo "Updating ${tool}..."
+      brew upgrade "${tool}"
+    else
+      echo "${tool} is already installed and up-to-date."
+    fi
+  else
+    echo "Installing ${tool}..."
+    brew install "${tool}"
+  fi
+done
diff --git a/demo/all-demos.sh b/demo/all-demos.sh
new file mode 100755
index 0000000..bea70b6
--- /dev/null
+++ b/demo/all-demos.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+###
+### Run all demo scripts.
+###
+
+SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
+declare -r SCRIPT_DIR
+
+# Find all -demo.sh files in the demo directory and run them.
+for demo_script in "${SCRIPT_DIR}"/*-demo.sh; do
+  if [[ -f "${demo_script}" ]]; then
+    echo "Running demo: ${demo_script}"
+    "${demo_script}"
+    echo
+  fi
+done
diff --git a/demo/gnucompat-demo.sh b/demo/gnucompat-demo.sh
new file mode 100755
index 0000000..90f13f6
--- /dev/null
+++ b/demo/gnucompat-demo.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+###
+### Demo for GNU Tools Compatibility Layer
+###
+
+SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
+declare -r SCRIPT_DIR
+# shellcheck source=/dev/null
+source "${SCRIPT_DIR}/../lib_gnucompat.sh"
+
+# Function to output the path and GNU status of a command
+function output_command_info() {
+  local cmd_var_name="${1}"
+  local cmd="${!cmd_var_name}"
+  local cmd_path
+  cmd_path=$(command -v "${cmd}")
+  local gnu_status
+  if is_gnu "${cmd}"; then
+    gnu_status="Yes"
+  else
+    gnu_status="No"
+  fi
+  echo "${cmd_var_name}: ${cmd_path} (GNU? ${gnu_status})"
+}
+
+# Output information for each command
+output_command_info "SED"
+output_command_info "AWK"
+output_command_info "GREP"
+output_command_info "FIND"
+output_command_info "SORT"
+output_command_info "TAR"
+output_command_info "DATE"
+output_command_info "XARGS"
+output_command_info "CUT"
+output_command_info "HEAD"
+output_command_info "TAIL"
+output_command_info "TR"
+output_command_info "UNIQ"
+output_command_info "WC"
+output_command_info "DIFF"
diff --git a/lib_gnucompat.sh b/lib_gnucompat.sh
index e000435..5c36813 100644
--- a/lib_gnucompat.sh
+++ b/lib_gnucompat.sh
@@ -156,11 +156,16 @@ export DIFF
 function is_gnu() {
   local cmd="${1:?Error: No command provided to is_gnu function}"
 
-  # Check if the command is a GNU tool by expecting the version output
-  # to contain "GNU".
+  # Check if the command is available
+  if ! command -v "${cmd}" &>/dev/null; then
+    return 0
+  fi
+
+  ("${cmd}" --version &>/dev/null) || return 1
+
   local version_output
   version_output="$("${cmd}" --version 2>&1)"
-  if "${GREP}" -q "GNU" <<<"${version_output}"; then
+  if [[ "${version_output}" == *"GNU"* ]]; then
     return 0
   else
     return 1