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Asked: 2024-09-25T11:13:13+05:30 In:

I’m encountering a “permission denied” error when trying to execute a script on my Ubuntu system. I’ve checked the file permissions and even attempted to modify them, but the issue persists. Can anyone provide guidance on how to resolve this problem?

I’m having a bit of a frustrating time with my Ubuntu setup and could really use some input from those who might have faced something similar. So here’s the deal: I’ve been trying to run a script that I wrote to automate some tasks, but I keep hitting this “permission denied” error whenever I attempt to execute it. It’s honestly driving me a little crazy!

First off, I made sure to check the file permissions using the `ls -l` command, and it’s showing that the script is owned by me, which should mean I have the right to execute it. For good measure, I also tried changing the permissions using `chmod +x myscript.sh`, which I thought would make it executable. But guess what? That didn’t work either!

I even checked if I’m in the right directory and looked to see if there were any issues with how I’m calling the script. I’m trying to run it with `./myscript.sh`, but nope, still no luck. It’s like my system just doesn’t want to cooperate.

I also considered whether I might need to run it as a superuser, so I tried using `sudo ./myscript.sh`, but that didn’t help me out either. I feel like I’ve tried all the common solutions I could find online, like checking for syntax errors in the script itself, but everything seems fine on that front.

Has anyone else been in this position before? Any tips on what I might be missing? Are there any other commands I should be using to troubleshoot this, or perhaps configurations I need to check? I’m kind of at my wit’s end here and could really use some guidance from anyone who knows their way around these permission issues in Ubuntu. Thanks a ton!

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    2 Answers


    1. It sounds like you’ve already taken some useful steps to troubleshoot the “permission denied” error you’re experiencing while trying to execute your script. Given that you’ve confirmed the file ownership with `ls -l`, applied `chmod +x`, and attempted to run the script with `./myscript.sh`, it’s possible that there are a few underlying issues to consider. One common culprit could be the script’s line endings; if your script was created on Windows, it might have Windows-style line endings (CRLF) instead of Unix-style (LF). You can convert the line endings using the `dos2unix` command: dos2unix myscript.sh. Another option is to check if there’s a shebang line at the top of your script, like #!/bin/bash, which specifies the interpreter to use when executing the script. Missing or incorrect shebang lines can lead to execution problems.

      Additionally, it’s worth investigating whether the directory containing your script has the execute permission set, especially if you’re attempting to execute it from a specific location. You can check this with `ls -ld `. If you still encounter problems, running strace ./myscript.sh can provide more debugging information by tracing system calls made by your script. This way, you can see what might be giving rise to the permission error. If all else fails, considering alternative execution methods, such as sourcing the script with source myscript.sh or executing it from within a terminal emulator like Gnome Terminal, might provide additional insights. Seeking help on forums like Ask Ubuntu or Stack Overflow by sharing your exact error messages and context can also yield useful tips from the community.


    2. “`html

      • Check the shebang line: Make sure your script starts with a proper shebang line, like #!/bin/bash for Bash scripts. This tells the system which interpreter to use to run your script.
      • File system type: If your script is on a filesystem that doesn’t support executable permissions (like FAT32), you’ll run into permission errors. You can check this by running df -T myscript.sh.
      • Look for hidden characters: Sometimes, if you copy-pasted text into your script, there might be hidden special characters that can cause issues. Try recreating the file using a text editor directly in the terminal like nano myscript.sh.
      • Check for executable permissions: Double-check the output of ls -l myscript.sh to ensure it has execute permissions for your user on the correct mode. You should see something like -rwxr-xr-x.
      • Run with bash explicitly: Instead of executing ./myscript.sh, you can try bash myscript.sh directly to see if that bypasses the execution issue.

      Hopefully, one of these ideas will help you out! It can be really frustrating to deal with such permission issues, but hang in there, and don’t hesitate to ask for more help if you can’t find a solution!

      “`

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