diff --git a/constructor/header.sh b/constructor/header.sh
index 32e8c24f6..2108fd29b 100644
--- a/constructor/header.sh
+++ b/constructor/header.sh
@@ -23,9 +23,9 @@ fi
 
 # Export variables to make installer metadata available to pre/post install scripts
 # NOTE: If more vars are added, make sure to update the examples/scripts tests too
-export INSTALLER_NAME="__NAME__"
-export INSTALLER_VER="__VERSION__"
-export INSTALLER_PLAT="__PLAT__"
+export INSTALLER_NAME='__NAME__'
+export INSTALLER_VER='__VERSION__'
+export INSTALLER_PLAT='__PLAT__'
 export INSTALLER_TYPE="SH"
 
 THIS_DIR=$(DIRNAME=$(dirname "$0"); cd "$DIRNAME"; pwd)
@@ -49,7 +49,7 @@ REINSTALL=0
 USAGE="
 usage: $0 [options]
 
-Installs __NAME__ __VERSION__
+Installs ${INSTALLER_NAME} ${INSTALLER_VER}
 
 #if batch_mode
 -i           run install in interactive mode
@@ -130,9 +130,9 @@ then
     if [ "$(uname -m)" = "x86_64" ]; then
         printf "WARNING:\\n"
         printf "    Your system is x86_64, but you are trying to install an x86 (32-bit)\\n"
-        printf "    version of __NAME__.  Unless you have the necessary 32-bit libraries\\n"
-        printf "    installed, __NAME__ will not work.\\n"
-        printf "    We STRONGLY recommend installing the x86_64 version of __NAME__ on\\n"
+        printf "    version of %s.  Unless you have the necessary 32-bit libraries\\n" "${INSTALLER_NAME}"
+        printf "    installed, %s will not work.\\n" "${INSTALLER_NAME}"
+        printf "    We STRONGLY recommend installing the x86_64 version of %s on\\n" "${INSTALLER_NAME}"
         printf "    an x86_64 system.\\n"
         printf "    Are sure you want to continue the installation? [yes|no]\\n"
         printf "[no] >>> "
@@ -150,7 +150,7 @@ then
     if [ "$(uname -m)" != "x86_64" ]; then
         printf "WARNING:\\n"
         printf "    Your operating system appears not to be 64-bit, but you are trying to\\n"
-        printf "    install a 64-bit version of __NAME__.\\n"
+        printf "    install a 64-bit version of %s.\\n" "${INSTALLER_NAME}"
         printf "    Are sure you want to continue the installation? [yes|no]\\n"
         printf "[no] >>> "
         read -r ans
@@ -167,7 +167,7 @@ then
     if [ "$(uname -m)" != "ppc64le" ]; then
         printf "WARNING:\\n"
         printf "    Your machine hardware does not appear to be Power8 (little endian), \\n"
-        printf "    but you are trying to install a ppc64le version of __NAME__.\\n"
+        printf "    but you are trying to install a ppc64le version of %s.\\n" "${INSTALLER_NAME}"
         printf "    Are sure you want to continue the installation? [yes|no]\\n"
         printf "[no] >>> "
         read -r ans
@@ -184,7 +184,7 @@ then
     if [ "$(uname -m)" != "s390x" ]; then
         printf "WARNING:\\n"
         printf "    Your machine hardware does not appear to be s390x (big endian), \\n"
-        printf "    but you are trying to install a s390x version of __NAME__.\\n"
+        printf "    but you are trying to install a s390x version of %s.\\n" "${INSTALLER_NAME}"
         printf "    Are sure you want to continue the installation? [yes|no]\\n"
         printf "[no] >>> "
         read -r ans
@@ -201,7 +201,7 @@ then
     if [ "$(uname -m)" != "aarch64" ]; then
         printf "WARNING:\\n"
         printf "    Your machine hardware does not appear to be aarch64, \\n"
-        printf "    but you are trying to install a aarch64 version of __NAME__.\\n"
+        printf "    but you are trying to install a aarch64 version of %s.\\n" "${INSTALLER_NAME}"
         printf "    Are sure you want to continue the installation? [yes|no]\\n"
         printf "[no] >>> "
         read -r ans
@@ -218,7 +218,7 @@ then
     if [ "$(uname)" != "Darwin" ]; then
         printf "WARNING:\\n"
         printf "    Your operating system does not appear to be macOS, \\n"
-        printf "    but you are trying to install a macOS version of __NAME__.\\n"
+        printf "    but you are trying to install a macOS version of %s.\\n" "${INSTALLER_NAME}"
         printf "    Are sure you want to continue the installation? [yes|no]\\n"
         printf "[no] >>> "
         read -r ans
@@ -235,7 +235,7 @@ then
     if [ "$(uname)" != "Linux" ]; then
         printf "WARNING:\\n"
         printf "    Your operating system does not appear to be Linux, \\n"
-        printf "    but you are trying to install a Linux version of __NAME__.\\n"
+        printf "    but you are trying to install a Linux version of %s.\\n" "${INSTALLER_NAME}"
         printf "    Are sure you want to continue the installation? [yes|no]\\n"
         printf "[no] >>> "
         read -r ans
@@ -249,7 +249,7 @@ then
 #endif
 
     printf "\\n"
-    printf "Welcome to __NAME__ __VERSION__\\n"
+    printf "Welcome to %s %s\\n" "${INSTALLER_NAME}" "${INSTALLER_VER}"
 #if has_license
     printf "\\n"
     printf "In order to continue the installation process, please review the license\\n"
@@ -261,7 +261,7 @@ then
     if command -v "more" > /dev/null 2>&1; then
       pager="more"
     fi
-    "$pager" <<EOF
+    "$pager" <<'EOF'
 __LICENSE__
 EOF
     printf "\\n"
@@ -283,7 +283,7 @@ EOF
 #endif
 
     printf "\\n"
-    printf "__NAME__ will now be installed into this location:\\n"
+    printf "%s will now be installed into this location:\\n" "${INSTALLER_NAME}"
     printf "%s\\n" "$PREFIX"
     printf "\\n"
     printf "  - Press ENTER to confirm the location\\n"
@@ -517,17 +517,17 @@ else
     find "$PREFIX/pkgs" -type d -empty -exec rmdir {} \; 2>/dev/null || :
 fi
 
-cat <<EOF
+cat <<'EOF'
 __CONCLUSION_TEXT__
 EOF
 
 if [ "${PYTHONPATH:-}" != "" ]; then
     printf "WARNING:\\n"
     printf "    You currently have a PYTHONPATH environment variable set. This may cause\\n"
-    printf "    unexpected behavior when running the Python interpreter in __NAME__.\\n"
+    printf "    unexpected behavior when running the Python interpreter in %s.\\n" "${INSTALLER_NAME}"
     printf "    For best results, please verify that your PYTHONPATH only points to\\n"
     printf "    directories of packages that are compatible with the Python interpreter\\n"
-    printf "    in __NAME__: %s\\n" "$PREFIX"
+    printf "    in %s: %s\\n" "${INSTALLER_NAME}" "$PREFIX"
 fi
 
 if [ "$BATCH" = "0" ]; then
@@ -541,7 +541,7 @@ if [ "$BATCH" = "0" ]; then
 #if has_conda and initialize_conda is True
     # Interactive mode.
 
-    printf "Do you wish the installer to initialize __NAME__\\n"
+    printf "Do you wish the installer to initialize %s\\n" "${INSTALLER_NAME}"
     printf "by running conda init? [yes|no]\\n"
     printf "[%s] >>> " "$DEFAULT"
     read -r ans
@@ -582,7 +582,7 @@ if [ "$BATCH" = "0" ]; then
     printf "\\n"
 #endif
 
-    printf "Thank you for installing __NAME__!\\n"
+    printf "Thank you for installing %s!\\n" "${INSTALLER_NAME}"
 fi # !BATCH
 
 
@@ -593,16 +593,16 @@ if [ "$TEST" = "1" ]; then
     (# shellcheck disable=SC1091
      . "$PREFIX"/bin/activate
      which conda-build > /dev/null 2>&1 || conda install -y conda-build
-     if [ ! -d "$PREFIX"/conda-bld/__PLAT__ ]; then
-         mkdir -p "$PREFIX"/conda-bld/__PLAT__
+     if [ ! -d "$PREFIX/conda-bld/${INSTALLER_PLAT}" ]; then
+         mkdir -p "$PREFIX/conda-bld/${INSTALLER_PLAT}"
      fi
-     cp -f "$PREFIX"/pkgs/*.tar.bz2 "$PREFIX"/conda-bld/__PLAT__/
-     cp -f "$PREFIX"/pkgs/*.conda "$PREFIX"/conda-bld/__PLAT__/
+     cp -f "$PREFIX"/pkgs/*.tar.bz2 "$PREFIX/conda-bld/${INSTALLER_PLAT}/"
+     cp -f "$PREFIX"/pkgs/*.conda "$PREFIX/conda-bld/${INSTALLER_PLAT}/"
      if [ "$CLEAR_AFTER_TEST" = "1" ]; then
          rm -rf "$PREFIX/pkgs"
      fi
-     conda index "$PREFIX"/conda-bld/__PLAT__/
-     conda-build --override-channels --channel local --test --keep-going "$PREFIX"/conda-bld/__PLAT__/*.tar.bz2
+     conda index "$PREFIX/conda-bld/${INSTALLER_PLAT}/"
+     conda-build --override-channels --channel local --test --keep-going "$PREFIX/conda-bld/${INSTALLER_PLAT}/"*.tar.bz2
     ) || NFAILS=$?
     if [ "$NFAILS" != "0" ]; then
         if [ "$NFAILS" = "1" ]; then
diff --git a/examples/miniforge/EULA.txt b/examples/miniforge/EULA.txt
new file mode 100644
index 000000000..d3bdc5b4e
--- /dev/null
+++ b/examples/miniforge/EULA.txt
@@ -0,0 +1,28 @@
+Copyright (c) 2016, Example, Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of Example, Inc. nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL EXAMPLE, INC. BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The License has to be read correctly so that dollar signs don't lead to an unset
+parameter error:
+You have to pay US $8, if you can read this.
diff --git a/examples/miniforge/construct.yaml b/examples/miniforge/construct.yaml
index b93540814..8d97911bf 100644
--- a/examples/miniforge/construct.yaml
+++ b/examples/miniforge/construct.yaml
@@ -1,6 +1,7 @@
 name: Miniforge3
 version: 4.10.1-0
 company: conda-forge
+license_file: EULA.txt
 
 channels:
   - conda-forge
diff --git a/news/638-fix-header.sh-pager b/news/638-fix-header.sh-pager
new file mode 100644
index 000000000..78bb89a76
--- /dev/null
+++ b/news/638-fix-header.sh-pager
@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Protect all user setable variables in .sh installers against variable substitution. This allows `$` signs as part of the license/conclusion/name/version text without causing unexpected `$1: unbound variable` errors. (#635 via #638)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* Test some .sh installers in interactive mode to test the interactive code path of the header.sh. (#637 via #638)
diff --git a/scripts/run_examples.py b/scripts/run_examples.py
index 812b8c63f..c4cafc0a9 100644
--- a/scripts/run_examples.py
+++ b/scripts/run_examples.py
@@ -28,8 +28,14 @@
 BLACKLIST = []
 WITH_SPACES = {"extra_files", "noconda", "signing", "scripts"}
 
+# .sh installers to also test in interactiv mode
+# (require all to a have License = have same interactive input steps)
+INTERACTIVE_TESTS = ['miniforge']
+# Test runs with even Python version are done in interactive mode, odd in batch mode
+INTERACTIVE_TESTING = (sys.version_info.minor % 2) == 0
 
-def _execute(cmd, **env_vars):
+
+def _execute(cmd, installer_input=None, **env_vars):
     print(' '.join(cmd))
     t0 = time.time()
     if env_vars:
@@ -37,9 +43,16 @@ def _execute(cmd, **env_vars):
         env.update(env_vars)
     else:
         env = None
-    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, env=env)
+    p = subprocess.Popen(
+        cmd,
+        stdin=subprocess.PIPE if installer_input else None,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True,
+        env=env,
+    )
     try:
-        stdout, stderr = p.communicate(timeout=420)
+        stdout, stderr = p.communicate(input=installer_input, timeout=420)
         errored = p.returncode != 0
     except subprocess.TimeoutExpired:
         p.kill()
@@ -137,8 +150,14 @@ def run_examples(keep_artifacts=None, conda_exe=None, debug=False):
             rm_rf(env_dir)
             fpath = os.path.join(output_dir, fpath)
             print('--- Testing', os.path.basename(fpath))
+            installer_input = None
             if ext == 'sh':
-                cmd = ['/bin/sh', fpath, '-b', '-p', env_dir]
+                if INTERACTIVE_TESTING and example_name in INTERACTIVE_TESTS:
+                    cmd = ['/bin/sh', fpath]
+                    # Input: Enter, yes to the license, installation folder, no to initialize shells
+                    installer_input = f"\nyes\n{env_dir}\nno\n"
+                else:
+                    cmd = ['/bin/sh', fpath, '-b', '-p', env_dir]
             elif ext == 'pkg':
                 if os.environ.get("CI"):
                     # We want to run it in an arbitrary directory, but the options
@@ -162,7 +181,7 @@ def run_examples(keep_artifacts=None, conda_exe=None, debug=False):
                 # This is why we have this weird .split() thingy down here:
                 cmd = ['cmd.exe', '/c', 'start', '/wait', fpath, '/S', *f'/D={env_dir}'.split()]
             env = {"CONDA_VERBOSITY": "3"} if debug else {}
-            test_errored = _execute(cmd, **env)
+            test_errored = _execute(cmd, installer_input=installer_input, **env)
             # Windows EXEs never throw a non-0 exit code, so we need to check the logs,
             # which are only written if a special NSIS build is used
             win_error_lines = []