Is there any way, we can find files not empty? I know one can find empty files by using find with -size is equalled to 0.

Please let me know, how I can find files greater than 0 or any other size in number?

You can use the find command to find non-zero length files:

find path -type f ! -size 0

In most UNIX implementations, the -size expression can also be used to search for file sizes of exactly N bytes (-size Nc), greater-than N bytes (-size +Nc), and less-than N bytes (-size -Nc).

The confusing thing is that the numeric following -size is, by default, 512-byte blocks not a byte count. The numeric must be followed by a 'c' for that. The following command will find files less than 2KB:

find . -type f -size -2048c -print

Conversely, for files greater than 2KB:

find . -type f -size +2048c -print

One note, the 512-byte block count does not directly translate into bytes. It's a long story. You can display a file's block usage with, under Solaris, ls -s. Stick to byte counts.

Oh, yes, one more thing, you can search for a specific range by using multiple -size expressions as long as they can all be satisfied by a single file. For example, locate files larger than 2KB and less than 8KB (inclusive):

find . -type f -size +2047c -size -8193c