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You can just 'mv' a file so example
mv foo.txt foo.old
Would rename foo.txt to foo.old. Lol ooops you said to all files. Give me a second to get home, I'm driving

Is nova a subdirectory of the directory you're currently in? The period means "in the directory I'm currently in". So "./nova" means nova is a subdirectory of the directory your shell prompt is...

tova.bac is the directory name? And it's a subdirectory of the directory you are currently in? If not that won't work. You need a semicolon ; after that last back slash. \;

find ./ -name "*.c" -size 10 -exec cp . {} \;

find -command -exec cp -command {} \;

Below command for your reference, which will find out all files bigger than 100K
find /DIR -type f -size +100K

cat *.c >> backup.bac

That doesn't do what you think it does. (I made the same mistake when I first started shell scripting.)

The greater-than symbol, >, is a redirection operator, not a comparison operator (unless it...

You are beginning to discover for yourself just what's wrong with the C-shell. I think you missed some spaces, but the ad-hoc parser throws a wobbly and returns an error that has nothing to do with...