diff --git a/pytinytex/__init__.py b/pytinytex/__init__.py
index 13bb5a3..bcb151b 100644
--- a/pytinytex/__init__.py
+++ b/pytinytex/__init__.py
@@ -1,22 +1,36 @@
+import asyncio
+from pathlib import Path
 import sys
 import os
-import subprocess
 import platform
+import logging
 
 from .tinytex_download import download_tinytex, DEFAULT_TARGET_FOLDER # noqa
 
+logger = logging.getLogger("pytinytex")
+formatter = logging.Formatter('%(message)s')
+
+# create a console handler and set the level to debug
+ch = logging.StreamHandler()
+ch.setFormatter(formatter)
+logger.addHandler(ch)
+
+
+
 # Global cache
 __tinytex_path = None
 
 def update(package="-all"):
 	path = get_tinytex_path()
-	try:
-		code, stdout,stderr = _run_tlmgr_command(["update", package], path, False)
-		return True
-	except RuntimeError:
-		raise
-		return False
+	return _run_tlmgr_command(["update", package], path, False)
+
+def help():
+	path = get_tinytex_path()
+	return _run_tlmgr_command(["help"], path, False)
 
+def shell():
+	path = get_tinytex_path()
+	return _run_tlmgr_command(["shell"], path, False, True)
 
 def get_tinytex_path(base=None):
 	if __tinytex_path:
@@ -74,41 +88,96 @@ def _get_file(dir, prefix):
 	except FileNotFoundError:
 		raise RuntimeError("Unable to find {}.".format(prefix))
 
-def _run_tlmgr_command(args, path, machine_readable=True):
+def _run_tlmgr_command(args, path, machine_readable=True, interactive=False):
 	if machine_readable:
 		if "--machine-readable" not in args:
 			args.insert(0, "--machine-readable")
 	tlmgr_executable = _get_file(path, "tlmgr")
+	# resolve any symlinks
+	tlmgr_executable = str(Path(tlmgr_executable).resolve(True))
 	args.insert(0, tlmgr_executable)
 	new_env = os.environ.copy()
 	creation_flag = 0x08000000 if sys.platform == "win32" else 0 # set creation flag to not open TinyTeX in new console on windows
-	p = subprocess.Popen(
-		args,
-		stdout=subprocess.PIPE,
-		stderr=subprocess.PIPE,
-		env=new_env,
-		creationflags=creation_flag)
-	# something else than 'None' indicates that the process already terminated
-	if p.returncode is not None:
-		raise RuntimeError(
-			'TLMGR died with exitcode "%s" before receiving input: %s' % (p.returncode,
-																		   p.stderr.read())
-		)
-	
-	stdout, stderr = p.communicate()
-	
+
 	try:
-		stdout = stdout.decode("utf-8")
-	except UnicodeDecodeError:
-		raise RuntimeError("Unable to decode stdout from TinyTeX")
-	
+		logger.debug(f"Running command: {args}")
+		return asyncio.run(_run_command(*args, stdin=interactive, env=new_env, creationflags=creation_flag))
+	except Exception:
+		raise
+
+async def read_stdout(process, output_buffer):
+	"""Read lines from process.stdout and print them."""
+	logger.debug(f"Reading stdout from process {process.pid}")
+	try:
+		while True:
+			line = await process.stdout.readline()
+			if not line:  # EOF reached
+				break
+			line = line.decode('utf-8').rstrip()
+			output_buffer.append(line)
+			logger.info(line)
+	except Exception as e:
+		logger.error(f"Error in read_stdout: {e}")
+	finally:
+		process._transport.close()
+	return await process.wait()
+
+async def send_stdin(process):
+	"""Read user input from sys.stdin and send it to process.stdin."""
+	logger.debug(f"Sending stdin to process {process.pid}")
+	loop = asyncio.get_running_loop()
 	try:
-		stderr = stderr.decode("utf-8")
-	except UnicodeDecodeError:
-		raise RuntimeError("Unable to decode stderr from TinyTeX")
+		while True:
+			# Offload the blocking sys.stdin.readline() call to the executor.
+			user_input = await loop.run_in_executor(None, sys.stdin.readline)
+			if not user_input:  # EOF (e.g. Ctrl-D)
+				break
+			process.stdin.write(user_input.encode('utf-8'))
+			await process.stdin.drain()
+	except Exception as e:
+		logger.error(f"Error in send_stdin: {e}")
+	finally:
+		if process.stdin:
+			process._transport.close()
+
+
+async def _run_command(*args, stdin=False, **kwargs):
+	# Create the subprocess with pipes for stdout and stdin.
+	process = await asyncio.create_subprocess_exec(
+		*args,
+		stdout=asyncio.subprocess.PIPE,
+		stderr=asyncio.subprocess.STDOUT,
+		stdin=asyncio.subprocess.PIPE if stdin else asyncio.subprocess.DEVNULL,
+		**kwargs
+	)
+
+	output_buffer = []
+	# Create tasks to read stdout and send stdin concurrently.
+	stdout_task = asyncio.create_task(read_stdout(process, output_buffer))
+	stdin_task  = None
+	if stdin:
+		stdin_task  = asyncio.create_task(send_stdin(process))
 	
-	if stderr == "" and p.returncode == 0:
-		return p.returncode, stdout, stderr
-	else:
-		raise RuntimeError("TLMGR died with the following error:\n{0}".format(stderr.strip()))
-		return p.returncode, stdout, stderr
+	try:
+		if stdin:
+			# Wait for both tasks to complete.
+			logger.debug("Waiting for stdout and stdin tasks to complete")
+			await asyncio.gather(stdout_task, stdin_task)
+		else:
+			# Wait for the stdout task to complete.
+			logger.debug("Waiting for stdout task to complete")
+			await stdout_task
+		# Return the process return code.
+		exit_code = await process.wait()
+	except KeyboardInterrupt:
+		process.terminate()  # Gracefully terminate the subprocess.
+		exit_code = await process.wait()
+	finally:
+		# Cancel tasks that are still running.
+		stdout_task.cancel()
+		if stdin_task:
+			stdin_task.cancel()
+	captured_output = "\n".join(output_buffer)
+	if exit_code != 0:
+		raise RuntimeError(f"Error running command: {captured_output}")
+	return exit_code, captured_output
diff --git a/tests/test_tinytex_runner.py b/tests/test_tinytex_runner.py
new file mode 100644
index 0000000..3472e49
--- /dev/null
+++ b/tests/test_tinytex_runner.py
@@ -0,0 +1,8 @@
+import pytinytex
+from .utils import download_tinytex, TINYTEX_DISTRIBUTION # noqa
+
+def test_run_help(download_tinytex): # noqa
+    exit_code, output = pytinytex.help()
+    assert exit_code == 0
+    assert "TeX Live" in output
+