I have a file created by some download program and generally the file name has "unprintable characters" from Linux command line point view. The cahacters are displayed as P?P?P? and so on. Copy/paste seems not working. So question is how can I manage these files? I can't even rename them, since no way to input any characters from name. MS-DOS has a nice feature as show me 8.3 file name only printable characters, however is missed in Linux. What to do? Do not suggest to access from MS-DOS though, I need these files under Linux.

You can do 'ls -b' to see non-printable characters, and then you can rename them.

Thanks for tip, unfortunately it doesn't work. It uncovered only some blanks. The rest, symbols like § I even acn't copy paste to make some reg expression. Is there some 3rd party program? I guess sisnce ls shows files, it can obtain handlers and rename. So if some program has the functionality.

This might be an example where a gui is better than the cli. Is X and some kind of gui desktop with a file manager like nautilus or thunar running on the system? If not how about a character mode file manager like midnight commander?
mc

So you dont know how to manage it in CLI, then you conclude the GUI is better?

OP: To rename that file:

$ \ls -ia

Take note the number next to the file name.

$ find . -maxdepth 1 -inum the_number_you_got_from_previous_command -exec mv {} new_file_name \;

Actually, I do know how to manage it with cli, and concluded that gui is better.

Try any of these

1. use single quotes around the name
2, try escaping '\' each bad char
3. try moving all normal files out of the dir, then cd up one and try something like
using the find cmd instead of '/bad_dir' may work better.
Basically use a technique that reads the dir's inode entries instead of using filenames.