diff --git a/bin/terminus b/bin/terminus
index 1b5a18740..dd402b7a4 100755
--- a/bin/terminus
+++ b/bin/terminus
@@ -1,81 +1,50 @@
-#!/usr/bin/env php
-<?php
-
-/**
- * This script runs Terminus. It does the following:
- *   - Includes the Composer autoload file
- *   - Starts a container with the input, output, application, and configuration objects
- *   - Starts a runner instance and runs the command
- *   - Exits with a status code
- */
-
-// Unset memory limit
-ini_set('memory_limit', -1);
-
-if (version_compare(PHP_VERSION, '8.2.0', '<') === true) {
-    fwrite(STDERR, "\n");
-    fwrite(STDERR, 'Sorry, your PHP version (' . PHP_VERSION . ') is no longer supported.' . "\n");
-    fwrite(STDERR, 'Upgrade to PHP 8.2 or newer to use Terminus 4. For PHP versions prior to 8.2, downgrade to Terminus 3.x.' . "\n\n");
-    fwrite(STDERR, 'For more information, see https://pantheon.io/docs/terminus/updates#php-version-compatibility-matrix' . "\n\n");
-    exit(1);
-}
-
-if (!getenv('TERMINUS_ALLOW_UNSUPPORTED_NEWER_PHP') && version_compare(PHP_VERSION, '8.5.0', '>=') === true) {
-    fwrite(STDERR, "\n");
-    fwrite(STDERR, 'PHP 8.5+ is not supported by this version of Terminus.' . "\n");
-    fwrite(STDERR, 'Check for new versions at https://github.com/pantheon-systems/terminus/releases' . "\n");
-    fwrite(STDERR, "\n");
-    fwrite(STDERR, 'Set environment variable TERMINUS_ALLOW_UNSUPPORTED_NEWER_PHP to try continuing anyway.' . "\n");
-    fwrite(STDERR, "Stopping.\n\n");
-    exit(1);
-}
-
-// This variable is automatically managed via updateDependenciesversion() in /RoboFile.php,
-// which is run after every call to composer update.
-$terminusPluginsDependenciesVersion = '51e2c517dd';
-
-// Cannot use $_SERVER superglobal since that's empty during phpunit testing
-// getenv('HOME') isn't set on Windows and generates a Notice.
-$home = @getenv('HOME');
-if (!empty($home)) {
-    // home should never end with a trailing slash.
-    $home = rtrim($home, '/');
-}
-
-if (empty($home) && !empty($_SERVER['HOMEDRIVE']) && !empty($_SERVER['HOMEPATH'])) {
-    // home on windows
-    $home = $_SERVER['HOMEDRIVE'] . $_SERVER['HOMEPATH'];
-    // If HOMEPATH is a root directory the path can end with a slash. Make sure
-    // that doesn't happen.
-    $home = rtrim($home, '\\/');
-    @putenv("HOME={$home}");
-}
-
-$pharPath = \Phar::running(true);
-if ($pharPath) {
-    include_once("$pharPath/vendor/autoload.php");
-} elseif (file_exists($path = __DIR__ . '/../vendor/autoload.php')
-        || file_exists($path = __DIR__ . '/../../autoload.php')
-        || file_exists($path = __DIR__ . '/../../../autoload.php')
-) {
-    include_once($path);
-} else {
-    throw new \Exception('Could not locate autoload.php');
-}
-
-use Pantheon\Terminus\Terminus;
-
-$home_tokens_folder = '.terminus' . DIRECTORY_SEPARATOR . 'cache' . DIRECTORY_SEPARATOR . 'tokens';
-
-$tokens_dir = $home . DIRECTORY_SEPARATOR . $home_tokens_folder;
-if (!is_dir($tokens_dir)) {
-    mkdir(
-            $tokens_dir,
-            0700,
-            true
-    );
-}
-
-$terminus = Terminus::factory($terminusPluginsDependenciesVersion);
-$status_code = $terminus->run();
-exit($status_code);
+#!/usr/bin/env sh
+
+SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+
+# If we can find a .env file next to the `terminus` binary, source it.
+# TODO: Is this a reasonable location? Where else should we look?
+# Should we make the filename more specific, e.g. `.terminus-env`?
+if [ -f "$SCRIPTPATH/.env" ]; then
+  source "$SCRIPTPATH/.env"
+fi
+
+# One good fallback location is in the Terminus config directory.
+# Note that we already have $HOME/.terminus/config.yml, but I
+# don't think we should parse that here.
+if [ -f "$HOME/.terminus/.env" ]; then
+  source "$HOME/.terminus/.env"
+fi
+
+# The logic below is ideal for scripts that are distributed
+# in `vendor/bin`. We might benefit if we decide to support
+# `terminus create-project pantheon-systems/terminus` as an
+# installation method. If we decide aginst this, we could
+# remove "$COMPOSER_RUNTIME_BIN_DIR" checks.
+if [ -z "$COMPOSER_RUNTIME_BIN_DIR" ]; then
+  # This branch is for the development of Drush itself.
+  # @see https://stackoverflow.com/questions/4774054
+  TERMINUS_EXECUTABLE="$SCRIPTPATH/terminus.php"
+else
+  TERMINUS_EXECUTABLE="$COMPOSER_RUNTIME_BIN_DIR/terminus.php"
+fi
+
+# If we can't find `terminus.php` next to `terminus`,
+# look for `terminus.php` in the same directory.
+if [ ! -f "$TERMINUS_EXECUTABLE" ]; then
+  TERMINUS_EXECUTABLE="$SCRIPTPATH/terminus.phar"
+fi
+
+# If there is no `terminus.phar` nearby, check for one
+# in the $PATH.
+if [ ! -f "$TERMINUS_EXECUTABLE" ]; then
+  TERMINUS_EXECUTABLE="terminus.phar"
+fi
+
+# Use the PHP binary indicated by $TERMINUS_PHP, or use
+# the one in the $PATH if $TERMINUS_PHP is not set.
+PHP="${TERMINUS_PHP=php}"
+
+# Run Terminus with the selected version of PHP, passing
+# through all parameters.
+exec "$TERMINUS_PHP" "$TERMINUS_EXECUTABLE" "$@"
diff --git a/bin/terminus.php b/bin/terminus.php
new file mode 100755
index 000000000..1b5a18740
--- /dev/null
+++ b/bin/terminus.php
@@ -0,0 +1,81 @@
+#!/usr/bin/env php
+<?php
+
+/**
+ * This script runs Terminus. It does the following:
+ *   - Includes the Composer autoload file
+ *   - Starts a container with the input, output, application, and configuration objects
+ *   - Starts a runner instance and runs the command
+ *   - Exits with a status code
+ */
+
+// Unset memory limit
+ini_set('memory_limit', -1);
+
+if (version_compare(PHP_VERSION, '8.2.0', '<') === true) {
+    fwrite(STDERR, "\n");
+    fwrite(STDERR, 'Sorry, your PHP version (' . PHP_VERSION . ') is no longer supported.' . "\n");
+    fwrite(STDERR, 'Upgrade to PHP 8.2 or newer to use Terminus 4. For PHP versions prior to 8.2, downgrade to Terminus 3.x.' . "\n\n");
+    fwrite(STDERR, 'For more information, see https://pantheon.io/docs/terminus/updates#php-version-compatibility-matrix' . "\n\n");
+    exit(1);
+}
+
+if (!getenv('TERMINUS_ALLOW_UNSUPPORTED_NEWER_PHP') && version_compare(PHP_VERSION, '8.5.0', '>=') === true) {
+    fwrite(STDERR, "\n");
+    fwrite(STDERR, 'PHP 8.5+ is not supported by this version of Terminus.' . "\n");
+    fwrite(STDERR, 'Check for new versions at https://github.com/pantheon-systems/terminus/releases' . "\n");
+    fwrite(STDERR, "\n");
+    fwrite(STDERR, 'Set environment variable TERMINUS_ALLOW_UNSUPPORTED_NEWER_PHP to try continuing anyway.' . "\n");
+    fwrite(STDERR, "Stopping.\n\n");
+    exit(1);
+}
+
+// This variable is automatically managed via updateDependenciesversion() in /RoboFile.php,
+// which is run after every call to composer update.
+$terminusPluginsDependenciesVersion = '51e2c517dd';
+
+// Cannot use $_SERVER superglobal since that's empty during phpunit testing
+// getenv('HOME') isn't set on Windows and generates a Notice.
+$home = @getenv('HOME');
+if (!empty($home)) {
+    // home should never end with a trailing slash.
+    $home = rtrim($home, '/');
+}
+
+if (empty($home) && !empty($_SERVER['HOMEDRIVE']) && !empty($_SERVER['HOMEPATH'])) {
+    // home on windows
+    $home = $_SERVER['HOMEDRIVE'] . $_SERVER['HOMEPATH'];
+    // If HOMEPATH is a root directory the path can end with a slash. Make sure
+    // that doesn't happen.
+    $home = rtrim($home, '\\/');
+    @putenv("HOME={$home}");
+}
+
+$pharPath = \Phar::running(true);
+if ($pharPath) {
+    include_once("$pharPath/vendor/autoload.php");
+} elseif (file_exists($path = __DIR__ . '/../vendor/autoload.php')
+        || file_exists($path = __DIR__ . '/../../autoload.php')
+        || file_exists($path = __DIR__ . '/../../../autoload.php')
+) {
+    include_once($path);
+} else {
+    throw new \Exception('Could not locate autoload.php');
+}
+
+use Pantheon\Terminus\Terminus;
+
+$home_tokens_folder = '.terminus' . DIRECTORY_SEPARATOR . 'cache' . DIRECTORY_SEPARATOR . 'tokens';
+
+$tokens_dir = $home . DIRECTORY_SEPARATOR . $home_tokens_folder;
+if (!is_dir($tokens_dir)) {
+    mkdir(
+            $tokens_dir,
+            0700,
+            true
+    );
+}
+
+$terminus = Terminus::factory($terminusPluginsDependenciesVersion);
+$status_code = $terminus->run();
+exit($status_code);
diff --git a/composer.json b/composer.json
index 83ddfc823..5cc2f1170 100644
--- a/composer.json
+++ b/composer.json
@@ -64,6 +64,7 @@
     ]
   },
   "bin": [
+    "bin/terminus.php",
     "bin/terminus"
   ],
   "scripts": {