# 
## Method overview
This **`os.ctermid()` method**  fetches the filename corresponding to the controlling terminal (i.e., the #key# POSIX: Portable Operating System Interface Family #key# terminal) of the process.
> The controlling terminal supervises a set of threads or processes grouped as a session.


## Syntax
---
```python
os.ctermid()
```
---

It does not take any argument value, nor does it return any.
## Explanation
Let's elaborate on this function with a code explanation:

# for UNIX based systems
# demo code about ctermid()
import os
# printing about filename controlling terminal
print("Filename parallel to the controlling terminal:")
print(os.ctermid())

* **Line 3:** We import the `os` module in the program.
* **Line 5:** We print the function call.
* **Line 6:** We call `os.ctermid()` to get the filename parallel to the controlling terminal.

What is the os.ctermid() method in Python?

 Method overview This os.ctermid() method  fetches the filename corresponding to the controlling terminal (i.e., the POSIXPortable Operating System Interface Family terminal) of the process.  The controlling terminal supervises a set of threads or processes grouped as a session.  