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Asked: September 27, 20242024-09-27T02:33:30+05:30 2024-09-27T02:33:30+05:30

How can I resolve the “inappropriate ioctl for device” error when trying to use the stty command with standard input in a terminal? What steps can I take to troubleshoot and fix this issue?

anonymous user

I’ve been stuck on this frustrating issue, and I could really use some help from anyone who’s dealt with it before. I was trying to use the `stty` command in my terminal to change some settings for standard input, but I keep hitting this annoying error: “inappropriate ioctl for device.” It’s like trying to use a wrench on a nut that doesn’t even fit.

Here’s the thing: I’m running some scripts that require certain terminal settings, and using `stty -a` seemed like a good way to check the current configuration. But every time I run the command, I get that error message popping up. After a bit of research, I found out that this usually happens when you try to run `stty` on something that isn’t actually a terminal device, like when you’re redirecting input from a file or possibly even when you’re in a non-interactive shell.

So, I started troubleshooting. First, I checked to make sure I was in a proper terminal session. I’m using a standard Linux environment, so I thought that should be fine. But then I realized I’ve also been running some of my commands through a script, and it hit me that maybe that’s the root of the issue.

I considered adjusting my scripts to ensure that they interact with the terminal correctly. Maybe I need to use a different approach for files or use a pipe? I even thought about modifying my terminal settings before running the scripts, but I’m not sure if that’s going to solve the problem.

If anyone’s faced this issue before, I’d love to hear how you managed to fix it. Did you find a workaround or maybe a different command that did the trick? It would be super helpful to get your insights! Also, if you know of any specific logs or debug tools that might help identify what’s going wrong, I’m all ears. Thanks in advance for your wisdom!

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    1. anonymous user
      2024-09-27T02:33:32+05:30Added an answer on September 27, 2024 at 2:33 am


      The “inappropriate ioctl for device” error you’re encountering when using the `stty` command typically indicates that the terminal settings cannot be changed because the command is being executed in a context that does not correspond to a terminal device. This often occurs when input is redirected from a file or the command runs in a non-interactive shell, such as within a script. To resolve this, you should ensure you run `stty` in an interactive terminal session. If your script needs specific terminal settings, consider separating the parts of your code that require terminal interaction and execute them in a true terminal context. Another alternative is to modify your scripts to avoid invoking `stty` directly and instead check for terminal conditions using shell built-ins like `test -t` before attempting to change the settings.

      If the aim is to obtain terminal settings in a script, you could redirect your script’s output to a terminal where `stty` can run without issue. Using a terminal multiplexer, like `tmux` or `screen`, can help by enabling you to run scripts while still maintaining an interactive terminal session. Additionally, if you’re looking for debugging tools, you can utilize `set -x` in your script to trace the commands being executed, or check the output of `echo $TERM` to ensure you are indeed dealing with a terminal environment. Share your findings or any specific outputs you receive while troubleshooting, and the community might be able to assist you further with tailored solutions.


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    2. anonymous user
      2024-09-27T02:33:31+05:30Added an answer on September 27, 2024 at 2:33 am






      stty Command Issue

      Help with `stty` command error

      It sounds like a really frustrating situation with the stty command! That “inappropriate ioctl for device” message can be super annoying. From what you described, it seems like you’ve figured out that stty won’t work properly if you’re not in a terminal context. You mentioned running scripts, which is key here.

      Just to clarify, when you run stty -a in a script that’s redirected or not tied to a terminal, you’ll definitely run into that error. It’s like you’re trying to change the settings of something that just isn’t there. If your script is running in a non-interactive shell, it won’t have access to terminal controls.

      Here are a few suggestions that might help:

      • Try running your script directly from an interactive terminal instead of piping or redirecting input. This should give it proper access to the terminal settings.
      • If you need to run those commands within a script, consider using expect or something similar that can simulate terminal interaction.
      • As an alternative to stty, you could use command-line tools that are designed for working with files without needing a terminal context, like cat or awk, depending on your specific needs.

      Debugging tools can also be helpful! You can try running your script with bash -x your_script.sh to see what’s happening as it runs. That can give you some insight into where the issue is cropping up.

      Hopefully, one of these suggestions helps you out! If you figure it out, it would be awesome to share how you did it. Good luck!


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