How to remove files...? (Linux)

[Quevas]

I've to create a form to remove files from a specified directory (in Linux).
The command echo rm -f file doesn't work, and the command mv copy the file instead of cut&past.
Certainly there's some problems with permissions...
Any idea?
Is It possible to remove files in this way?

Thanks

[Quevas]

OK, done.
...problems with permissions...