In termux android ls: cannot open directory '.': Permission denied?

Question

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'''ls: cannot open directory '.': Permission denied'''

Answer 1

beside the instruction other people mentioned:

• Go to Settings → Apps → All Apps → Termux → Permissions. Grant the permission to access the storage. After that, you shouldn't get this error for shared storage.
• run termux-setup-storage

you may also need to do it as a root user.

Answer 2

To get the list of files and folders using 'ls' command, it is necessary to have permission of storage first. And as termux app does not have storage permission option in settings, so, we have to run the command
termux-setup-storage
and provide the permission for termux app.
After restarting the app, the command runs perfectly.