I do have a segment in my code like follows:

if [ condition ] then
ls /nosuchdir
fi


what does the ls /nosuchdir means ??

The ls /nosuchdir command will give a listing of files in the /nosuchdir directory. Beware, since the directory is preceded by the / means that you are looking to the root of your system and not referencing from where you are currently.

I doubt whether you are aware /nosuchdir ...
"nosuchdir" is not a directory .. Its a concept in shell scripting..

So please let me know that...

hmmm... what 'concept' is that?

Here's a shot in the dark:

Since the file doesn't exist, the 'concept' is a quick and easy method of producing output that also affects the error flags.

I'm not sure I can 'parse' what's being said here!
Could you elaborate, pls?!

Check for a condition
If the condition is true
Then list files in the directory

Perhaps the vagueness, or "conceptualness", is confusing people

Provide actual script code