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Hi bakunin,

I am a beginner and only use bash shell. I got your idea and changed it to bash shell. It works. Thank you very much.

Thank you 2.
I got your idea although I can not run your code due to compile error.
Is there any convenient command to convert or substitute "rwxr-xr-x" to be "111101101"?
That means "change...

How to check the user input to be valid using shell script?

The valid input is in the format like as follows.
1. It can only have r,w,x or a hyphen and nothing else.
2. ensure the r, w, x are...